Journal of Energy Storage: M. Boulakhbar, B. Lebrouhi, T. Kousksou, S. Smouh, A. Jamil, M. Maaroufi, M. Zazi
Journal of Energy Storage: M. Boulakhbar, B. Lebrouhi, T. Kousksou, S. Smouh, A. Jamil, M. Maaroufi, M. Zazi
Keywords:                                                Renewable energies are a sustainable, unlimited and decarbonised solution to address future energy challenges.
Renewable energy integration                             In this context, Morocco has a considerable advantage to position itself on this promising market. Furthermore,
Energy storage                                           renewable energies have been highlighted as a key strategic source for the country's green growth. Morocco has
Power to X                                               adopted the renewable energy path through a strategy targeted on the development of solar, wind and hydro-
Morocco
                                                         electric power to boost its energy policy by adapting it to the challenges posed by today's world. Nowadays,
Thermal energy storage
Concentrated solar power
                                                         Morocco is facing a challenge to reach 52% by 2030 of its total renewable energy capacity, which will exceed
                                                         42% by the end of 2020. The main objective of this paper is to study a scenario for 2030 for the Moroccan
                                                         electricity system and to identify the challenges that need to be addressed in order to accelerate the integration
                                                         of renewable energies in the Moroccan energy mix and to achieve a possible export of such green energy towards
                                                         Europe.
1. Introduction                                                                              future [5]. Many governments around the world have directed their
                                                                                             transition policies to more sustainable and accessible energy systems
    The challenge of responding to the world's climate change is a                           [6–9]. In Morocco, electricity consumption demand increases at an
worldwide environmental problem that will impact all countries                               annual average of 7%, since 2002 [10]. The electrical power production
around the globe. Environmentalists alert international society and                          industry in Morocco is facing challenges involved with sustained
businesses that natural resources will run out faster than anticipated                       growth of demand, added to environmental protection requirements,
[1]. Indeed, energy demand in developed and developing countries is                          that's why energy security [11] and mitigation of emissions and en-
rising dramatically. By 2030, 40% and 50% increases in energy con-                           vironmental pollution are identified as the main motivating forces for
sumption is expected in Europe and in the USA, it will be doubled in                         the transformation of the existing electricity power supply system to a
India and it's expected to triple in China [2]. Since then, the global                       sustainable form of electricity [12–17].
world interests to increase the use of renewable energy sources and                              At COP 21 conference held in Paris, Morocco is promising an opti-
reduce the GHGE as a key solution.                                                           mistic and binding deal. It is in this perspective that the Moroccan
    The use of renewable energy sources (RES) can contribute to the                          government has launched a holistic plan to boost the percentage of
decarbonization of the power system and to ensure a sustainable energy                       renewable energy in the energy mix and substantially increase energy
supply throughout the world [3,4]. Over the past century, the share of                       efficiency. Goals have been established to increase the percentage of
renewable energy in the energy mix of many developed countries has                           renewable energy electricity generation capacity (42% by 2020 and
increased considerably and this trend is expected to continue in the                         52% by 2030 – see Fig. 1) and objectives to decrease energy
  Abbreviations: GHGE, Green House Gas Emissions; RES, Renewable energy sources; SDGs, Sustainable Development Goals; TOE, Tonne Oil Energy; MASEN,
Moroccan Agency for Solar Energy; CSP, Concentrated Solar Power; PV, Photovoltaic; ONEE, National Agency for Electricity and Water; PETS, Pumped Energy
Transfer Station; IRESEN, Institute of Research on solar energy and New Energies; IPPs, Independent Power Producer's Electricity.; LNG, Liquefied natural gas;
CCGTs, Combined Cycle Gas Turbines; SG, Smart Grid; SET Roadmap, Roadmap for Sustainable Electricity Trade; WWTP, Waste Water Treatment Plan; PtX, Power to
X; PtH, Power-to-Hydrogen; MSF, Multi-Stage Flash; MED, Multi-Effect Distillation; RO, Reverse Osmose; ED, Electro Dialyses; MVC, Mechanical Vapor compression;
TVC, Thermo-Vapor compression; BWRO, Brackish Water Reverse Osmose; SWRO, Sea Water Reverse Osmose; V2G, Vehicle to Grid; RETs, Renewable energy
technologies; RE, Renewable Energy; EU, European Union; R&D, Research and Development
  ⁎
    Corresponding authors.
    E-mail addresses: b.lebrouhi@etud.univ-pau.fr (B. Lebrouhi), tarik.kousksou@univ-pau.fr (T. Kousksou).
https://doi.org/10.1016/j.est.2020.101806
Received 27 May 2020; Received in revised form 4 August 2020; Accepted 25 August 2020
Available online 02 September 2020
2352-152X/ © 2020 Elsevier Ltd. All rights reserved.
M. Boulakhbar, et al.                                                                                                Journal of Energy Storage 32 (2020) 101806
consumption by 12% by 2020 and 15% by 2030 through energy effi-                    Currently, Morocco's renewable electricity system is widely di-
ciency enhancements [18–21]. For comparison, the European Com-                  versified and has a mix of solar, wind and hydroelectric power plants.
mission has adopted a mandatory goal of achieving 32% of renewable              Table 1 presents the total installed and planned capacity in 2018 and in
energy by 2030, with the possibility of revising this target upwards by         2020, respectively [27].
2023 [22].                                                                         The Kingdom of Morocco is currently considered as one of the
    However, as electrical systems incorporate higher levels of RE, the         leading countries in the world's energy transition, especially in Africa,
quality and reliability of the power supply becomes more challenging to         with several programmes to generate electricity from renewable
manage [23]. Although there are many alternative options to facilitate          sources.
the integration of RE systems, they are costly and complex [24]. In
addition, to ensure these options, significant changes in the organiza-
tion and functioning of electrical systems are required.                        2.1. Solar program
    Many papers [10,13,17] have explored Morocco's renewable energy
potential under various perspectives with a focus towards its national              Morocco has taken advantage of its geographical position and en-
energy strategy development. However, in this present paper, the cur-           vironment to gain an edge in the field of renewables, especially solar
rent situation of the Moroccan energy strategy is assessed with an in-          energy [28]. The average incident solar radiation varies between 4.7
depth analysis of the main renewable energy projects completed or               and 5.6 kWh/m2/day with a number of hours of sunshine that varies
under development in Morocco. As well as it focuses on a general scope          from 2700 hours/year in the North of Morocco to more than 3500
of the main actual trails and challenges facing the national energy             hours/year in the South.
strategy, with a clear and detailed roadmap of the key elements and                 Initiated in 2009, the Moroccan Solar Plan is a very ambitious
guidelines to be followed by Morocco in order to achieve its objectives         project. A number of solar power plants have been planned and
in terms of renewable energy and energy efficiency by 2030.                     scheduled to be installed as part of this project. The Moroccan Agency
                                                                                for Solar Energy (MASEN) was set up specifically to execute these
                                                                                projects. Its mission is to implement all projects related to the National
2. Current status of major RE projects in Morocco                               Energy Strategy and to co-ordinate and supervise all other activities
                                                                                connected with this initiative. Table 2 lists the major projects com-
    In addition to its commitments in favour of the climate (GHGE re-           pleted, in the process or planned in sites, with total investment esti-
duction of 32% by 2030), the Kingdom of Morocco faces many chal-                mated at approximately USD 9 billion through to 2020.
lenges in its energy transition. Efforts are aimed at matching the supply           We note that PV technology is featured in all projects due to a de-
and demand of primary energy, which is increasing by 5% per year,               crease in the price of photovoltaic modules of more than 80% over the
driven by the electricity demand, which is growing at a fairly steady           last ten years [29]. As part of the Mediterranean Solar Plan, Ouarzazate
annual rate of more than 6%, through the development of new elec-               plant has benefited from European co-financing. The overall Ouarza-
tricity production capacities, which should bring the installed capacity        zate project includes four power plants: Noor 1, Noor 2, Noor 3 and
to 25,000 MW in 2030. Security of supply also remains one of the major          Noor 4 with different technologies. Noor 2 has a capacity of 200 MW
challenges of the Moroccan energy model, which it is attempting to              based on parabolic mirror technology and Noor 3 is equipped with a
address through the diversification of its energy resources.                    solar tower of 100 MW capacity. Noor 4 based on photovoltaic tech-
    Morocco's primary energy demand and electricity demand will both            nology has an output of 72 MW. With a capacity of 160 MW, Noor 1 is
be expected to double by 2030. Figs. 2 and 3 show the evolution of the          currently one of the largest concentrated solar thermal (CSP) parabolic
primary energy demand and electricity consumption in Morocco re-                cylinder power plants in the world.
spectively [25]. Through 2020, in accordance with the SDGs (Sustain-                The solar power plant Noor 1 is mainly equipped with the advanced
able Development Goals), the Kingdom of Morocco is making good                  Concentrating Solar Power (CSP) generation, with Parabolic Trough
strides towards sustainable, secure and modern electricity. However,            Collector (PTC) [30]. By comparing this technology to solar energy
the ultimate target is to build a more diversified power system with a          tower, linear Fresnel Reflector and parabolic dish collector, the PTC
significant contribution from renewable sources.                                with thermal oil and molten salt storage is considered to be the simplest
    In 2018, Morocco installed 34% of renewable energy (i.e. 3,700              and most mature system [31,32] Prospective sites for CSP plants are
MW), divided as follows: 1,770 MW, 1,220 MW and 711 MW respec-                  generally selected based on the global distribution of Direct Normal
tively originate from hydroelectricity, wind power and solar energy             Irradiance (DNI) [33]. Commercially viable CSP plants should maintain
[26].                                                                           a DNI of at least 2000–2800 kWh/m2/yr [33,34]. The Rankine cycle
                                                                            2
M. Boulakhbar, et al.                                                                                                          Journal of Energy Storage 32 (2020) 101806
with molten salt storage is the operating principle of the Noor 1 plant          Table 1
(see Fig. 4) [35,36].                                                            Total installed and planned capacity in 2018 and in 2020.
    As shown in Fig. 4, the Noor 1 plant consists of three parts, which           Plant type   2018 Capacity installed (MW)         2020 Capacity to be installed (MW)
are the solar field, the power block and the thermal storage system.
These parts are properly outlined by Kuravi et al.[37]. The Noor 1                Solar        710.8                                2000
                                                                                  Wind         1220                                 2000
power plant's solar field consists of 400 parabolic trough loops arranged
                                                                                  Hydro        1770                                 2000
in parallel and connected to each other. Each loop consists of 4 arrays of
solar collectors in series and each array is composed of 12 solar col-
lector elements. The solar collectors composed of very reflective para-          Table 2
bolic mirrors and heat collection elements (HCE) installed in the center         Major solar projects.
of the dish. A monitoring system allows the collectors to follow the sun
                                                                                  Plant/Site             Production capacity      Technology       Commissioning year
from sunrise to sunset [37]. Once the direct solar irradiation is received
on the solar field and reflected by the parabolic collectors to the ab-           Ain Beni Mather        472   MW                 CSP/PV           2011
sorber, where the heat is transferred to the heat transfer fluid (HTF). A         Ourazazatte            580   MW                 CSP/PV           2018
synthetic oil which is used as HTF circulates through the collectors. At          Foum Al Oued           500   MW                 CSP/PV           2020
                                                                                  Boujdour               100   MW                 PV               2018
the output of the solar field, the HTF is collected and then pumped to an
                                                                                  Sbkhat –Tah            500   MW                 CSP/PV           2020
expansion tank, which is connected to the power block unit to transfer            NOOR Tafilalt          120   MW                 PV               2019
its energy to water. The power block includes a steam generator, pre-             NOOR Atlas             200   MW                 PV               2020
heater, steam turbine, power generator, condenser, cooling systems (air           NOOR Argane            200   MW                 PV               After 2020
condenser and cooling tower) and auxiliary equipment. The steam
generator has two heat exchanger trains including economizers, eva-
porators, superheaters and preheaters. The HTF flows through the two             (discharge mode). The HTF flows in heat exchanger to charge/dis-
heat exchanger trains in order to produce steam at high temperature              charge the thermal storage system. The molten salt circulates from the
and pressure.                                                                    cold storage tank through the heat exchanger and enters the hot salt
    The Noor 1 plant has been designed with two tanks of an eutectic             storage tank, with temperature of approximately 368°C. The tempera-
molten salt composed of a mixture of sodium nitrate and potassium                ture of the cold molten salt is about 292°C. When the storage system is
nitrate (60% NaNO3 + 40% KNO3). This mixture has a high heat                     discharged, the molten salt from the hot storage tank is sent back to
transfer coefficient and high thermal storage capacity. The function of          cold storage tank through the heat exchanger that is used to heat up the
the thermal storage system is to store excess sensible heat from the solar       cold HTF. The heated HTF is then sent to the power block.
field (charge mode) during daily sunshine hours, in order to extend
plant operation during night or when solar irradiation is insufficient
                                                                             3
M. Boulakhbar, et al.                                                                                                   Journal of Energy Storage 32 (2020) 101806
                                                                              4
M. Boulakhbar, et al.                                                                                                       Journal of Energy Storage 32 (2020) 101806
             Table 5                                                                 Table 6
             Current situation of the hydro projects by Mars 2020.                   Future hydropower projects in Morocco.
               Project                                  Capacity                      Project                 Location          Capacity         Situation
compared to 3.7 TWh in 2010, a year with abundant rainfall in Mor-                   the end of 2020. Meanwhile, Morocco plans to build about sixty large
occo. PETSs that are constructed or under development are expected to                dams over the next twenty years; however, most of them should be
serve as a storage mechanism for solar and wind energy Fig. 6 shows                  dedicated to water resource management, and therefore not necessarily
The PETS of 350 MW at the Abdelmoumen site in the Agadir region                      to power generation. Table 5 shows the current situation of the hydro
which will increase the hydraulic capacity of Morocco to 2120 MW by                  projects [39], and Table 6 shows the future hydropower projects in
                                                                                 5
M. Boulakhbar, et al.                                                                                                              Journal of Energy Storage 32 (2020) 101806
Morocco [10].                                                                              Moroccan government needs to diversify financing models for renew-
                                                                                           able energy projects and stimulate private sector investment in RE. In
                                                                                           addition, it needs to capitalize on the high potential of biomass through
2.4. Biomass program                                                                       concrete projects and immediate investments.
Table 7
Planned grid reinforcement added between 2019 and 2020.
  Reinforcement              2019                                                                    Horizon end of 2020
                             • Installation of a third transformer of 400/225 kV                     • Setup of a 3-phase line of 400 kV (300 km)
                             • Installation of a third autotransformer of 400/225 kV                 • Setup of a 3-phase line of 400 kV (300 km)
                             • Setup of a 3-phase line of 400 kV (55 km)                             • Setup of a 3-phase line of 400 kV
                             • Setup of a 3-phase line of 400 kV (400 km)                            • Addition of a new post of 400/225 kV
                                                                                                     • Replacement of a 225/60 kV transformer by a 400/225 kV transformer.
                                                                                       6
M. Boulakhbar, et al.                                                                                                  Journal of Energy Storage 32 (2020) 101806
have poor electrical infrastructure that limits their level of penetration        Despite the dispatching system, there are still production losses based
into the power grid. Today, the large amounts of electricity from re-             on future energy forecasts and emergency needs. Another important
newable sources and solidarity between territories are the main vectors           problem is that most of the electrical energy produced in the grid
for the evolution of the power grid and new challenges for transmission           cannot be stored. Therefore, the smart grid is essential to correlate
system operators. Some regions will essentially be importing and others           electricity generation with demand [50]. The development of smart
will be strongly exporting. The mesh and density of the electricity               grids is an essential prerequisite for moving from a unidirectional to a
network will be a key point in guaranteeing access to electricity and             bidirectional system, making it possible to act on demand and to adapt
security of supply from renewable energy sources.                                 consumption in part to instantaneous production capacities. Smart grids
    The integration of renewable energies in the Moroccan electricity             are designed to improve control of the electrical system throughout the
system also requires the mobilization of flexible modes of production to          entire chain of value from the producer to the end consumer. By making
address their intermittency and improve the stability of the power grid.          a portion of consumption (industrial and domestic) dependent on
Today, the introduction of combined cycle power plants operating on               available production, they make it possible to reduce demand peaks and
natural gas is positioned in Morocco as one of the most appropriate               thus reduce maximum production capacities in a given geographical
means to meet the challenges of intermittent power generated by re-               area. Similarly, it is perfectly possible to program certain equipment
newable energies. Gas is expected to play a major role in the electricity         (e.g. electric vehicles) to receive energy when there is a given over-
mix and according to [48] in 2011 the gas demand in the MENA                      production. The smart grid can reduce transmission and distribution
countries grew faster than in other regions., since Morocco plans to              losses by monitoring the capacity to distribute electrical energy effi-
import 5 billion cubic meters (bcm) of LNG via a new LNG import                   ciently through communication technologies. Digitalisation of network
terminal, which will provide 2,400 MW of new combined cycle gas                   will in some ways be a condition for the success of the energy transition
turbines (CCGTs).Morocco's needs for flexibility will increase and will           [51]. The deployment of renewable energies is challenging the way in
mainly be provided via decentralized tools (energy storage, erasure,              which the supply-demand balance has been achieved in the electricity
consumption modulation, electric vehicles batteries, decentralized                sector until now.
production) requiring the aggregation of a large number of diffuse                    Flexibility and security of the energy system must rely on the op-
points; distribution network operators will become real operators, re-            erating capability to allow both generation and usage dispersal and
sponsible for active network management and the organization of local             distortion between service quality and continuity [46]. That's why the
flexibility markets. The exploitation and optimization of the sources of          smart grid remains an essential element to develop in order to meet the
flexibility (question of global optimization / local optimization) will           ambitious target of 2030.
become an essential issue in Morocco.
                                                                                  3.3. Developing interconnections at regional level and with Europe
3.2. Smart grid in Morocco
                                                                                      One of the most practical ways to reduce the intermittency of re-
    The principal challenge for electricity distribution in Morocco is            newable energy is to interconnect them in order to mitigate the varia-
associated to environmental and climatic conditions caused by long                tions in electricity generated from such intermittent sources. For that
land distances, vast forests, severe winter seasons and high number of            purpose, Morocco needs to reinforce electricity interconnection infra-
overhead lines [49]. These problems require advanced automatic so-                structures at the regional level and with the European continent (see
lutions for fast defect management and long term grid forecasting.                Fig. 7). Electricity importations represent the main source of flexibility
Accordingly, in 2008 the ONEE installed a new more modern and ef-                 in Morocco since they play an important role in balancing supply and
ficient national distribution control centre called "Dispatching". The            demand [44].
new system, which has been installed in Casablanca city, manages in                   By exporting green electricity to Europe, considering its proximity
real time and under different conditions, between the change in elec-             to Spain, Morocco has the potential to become an important actor in the
tricity production facilities and a steadily rising of the national demand.       export of renewable electricity to a large regional market. In this
                                                                              7
M. Boulakhbar, et al.                                                                                                   Journal of Energy Storage 32 (2020) 101806
regard, several EU countries have interestingly implemented a                         more effective operation of the Moroccan electricity market.
"Roadmap for Sustainable Electricity Trade" (SET Roadmap) and signed
an official declaration during the COP22 with Morocco. In this per-              3.5. Energy storage
spective, Morocco has already achieved significant electricity inter-
connection capacities with Spain (1,400 MW). Currently, the inter-                  One of the main drawbacks of using renewable energy sources is the
connection with Spain is the unique link between Europe and North                management of their intermittent production. Thus, even if Morocco
Africa. Morocco is also interconnected with Algeria, with an exchange            holds the world record, especially in wind energy, the load factor, i.e.
capacity of 1,200 MW. The African market is very promising since it is           what the installation actually produces in relation to its capacity, is
relatively poorly electrified and represents real investment opportu-            40% for wind energy projects and falls at best to 20% for photovoltaic
nities for future years. Currently, Morocco continues the process of             projects. For the latter, it is therefore necessary to use electricity storage
regional integration of energy markets. Firstly, the country has a project       [12].
to establish an electrical interconnection line to Portugal with a capa-            Energy storage can render several services to power grids [53]:
city of 1,000 MW. Morocco is also planning to expand the inter-
connection with Spain by a third line with a capacity of 700 MW.                  • It can be used to address erratic and rapid variations in energy de-
Discussions are under way to establish new interconnection lines with                 mand and prevent the possible requirement for frequency adjust-
Mauritania.                                                                           ment from the main power system. It can also resolve temporary
    Thanks to the electricity interconnections with Algeria and Spain,                power interruptions, minimize harmonic distortions, and prevent
Morocco is positioned as a leading electricity market player in the                   voltage drops and bursts.
Western Mediterranean region and fully plays an important role both as            •   It avoids a partially loaded main power system, which is held op-
a regional energy hub and as a transit country for cross-border elec-                 erational to meet unplanned, unexpected demands and electrical
tricity exchanges. An ambitious project (Xlinks) is under consideration               urgencies resulting from the breakdown of generation plants and/or
to develop a new 3 GW submarine cable linking Morocco to the UK,                      transmission lines.
which will allow green electricity to be sent directly to the UK without          •   It helps to handle the peaks of the daily demand curve.
using existing infrastructure in Spain and France [52]. The project will          •   It allows excess electricity generated during off-peak hours to be
generate 6% of the UK's electricity demand. Given the important role of               stored to meet increased demand during peak hours.
interconnections in improving reserves capacity, the development of               •   It ensures the storage of electricity produced by renewable energies
electricity generation from renewable sources and the increase of RE                  in order to adapt fluctuating supply to shifting demand.
integration capacity from new interconnection projects are under con-
sideration.                                                                          The first large-scale electricity storage project in Morocco is the 460
    In line with the 2030 objective, Morocco is expected to significantly        MW Afourer Pumped Storage Power Station (PETS), commissioned in
boost investment in electricity trading and interconnections and to play         2004. It consists of a hydraulic system composed of two 1.3 million-m3
an important role in the development of the regional electricity market          water reservoirs connected by a pipeline with two hydroelectric pro-
in West Africa and its integration into the European market.                     duction units between the basins. The Abdelmoumen WWTP located in
                                                                                 Taroudant province will enhance hydraulic storage capacity in
3.4. Reorganisation of the electricity sector                                    Morocco. This station, piloted by the ONEE, has been under construc-
                                                                                 tion since July 2019 after the project was awarded to the consortium
     ONEE is currently the major player in Morocco's electricity market;         led by the French company Vinci Construction and including the
it is the sole purchaser and responsible for power imports and exports           company Andritz Hydro. The €284 million contract consists of the
and the purchase of electricity generated by independent power pro-              construction of a WWTP (Waste Water Treatment Plan) with two basins
ducers (IPPs), surplus electricity from self-generators and all renewable        connected by a 3 km transfer line with a 350 MW reversible hydro-
electricity production from MASEN projects. [44]. ONEE holds long-               power plant located in the middle.
term power purchase agreements (PPAs) with these entities. ONEE also                 It is interesting to mention that the Noor 1 power plant is equipped
owns generation plants, including coal, gas and wind (which will be              with a 3 hours thermal storage system. For Noor 2 and 3 plants, the
transferred to MASEN by 2021). ONEE's own generation market share                thermal storage time is up to 8 hours. This will guarantee continuity of
has decreased, with the growth of renewable energy projects developed            energy distribution, even in the evening, at times of peak consumption
by MASEN [44].                                                                   [54]. CSP thermal storage was also chosen to ensure 5 hours of au-
     Otherwise, under Law 38-16, ONEE has to transfer all renewable              tonomy for the first phase of the 800 MW Noor Midelt station in hybrid
energy generation assets within five years to MASEN (with the excep-             technology: CSP and PV. A 2nd phase, currently being prequalified by
tion of pump storage hydro plants, plants that are critical for the na-          MASEN, is competing between different solar technologies with sto-
tional electricity supply security and plants under Law 13-09). In terms         rage, in particular PV and CSP associated with different thermal storage
of market shares in 2016, ONEE supplied power to the national market             or battery technologies, with the aim of ensuring a stable power in-
from its own plants (29.2%), and through IPPs (52.9%) and imports                jected into the grid up to 230 MW.
(14.6%), with power from private industrial producers accounting for                 Energy Storage Technologies (EST) can be classified in to [55]:
the remainder (3.3%) [44]. The structure of the electricity industry is
detailed in the Fig. 8.                                                           • Mechanical storage systems [56] like Pumped Hydro-Storage (PHS),
     Two observations can be drawn from the analysis of Fig. 8:                       Compressed Air Energy Storage (CAES) and Flywheel Energy Sto-
                                                                                      rage (FES) technologies.
 • The National Agency for Electricity Regulation, which was created              •   Electrochemical storage systems [57] like batteries (Lead acid,
     in 2016, has not yet initiated its principal missions to ensure ef-              NiCd/NiMH, Li-ion, metal air, sodium sulphur and sodium nickel
     fective operation of the electricity market and to control the trans-            chloride) and flow batteries (Redox flow battery (RFB) and Hybrid
     mission and distribution operators. There is an urgent need to al-               flow battery (HFB)).
     locate financial and human resources to this agency to ensure its            •   Electrical storage systems [53] like Supercapacitors (SC) and Super-
     function in the Moroccan electricity market.                                     conducting Magnet energy storage (SMES) systems.
 •   The reorganisation of the ONEE and its business model by separ-              •   Chemical energy storage [58], which emphasizes hydrogen (H2) and
     ating the activities of the electricity value chain (i.e. generation,            synthetic natural gas (SNG) as secondary energy, vectors, as they
     transmission, distribution and marketing) is required to ensure a                could have a considerable impact on the storage of large quantities
                                                                             8
M. Boulakhbar, et al.                                                                                                Journal of Energy Storage 32 (2020) 101806
     of electrical energy.                                                      of high-energy systems in combination with high power systems ap-
 • Thermal Storage Systems (TSS) [59], which includes sensible, latent          pears to be more efficient EST [63]. High power storage systems pro-
     and thermochemical storage technologies. Thermal sensible storage          duce energy at very high rates, but typically for short time periods.
     is the most mature technology but has the lowest energy density,           Conversely, high-energy storage systems can generate energy for longer
     which is followed by the latent storage and then by thermochemical         periods [63,64]. To ensure its place in an electrical system, the hybrid
     storage. Thermal storage can provide important services to Mor-            energy storage system must not only demonstrate its technical re-
     occan power system and increase the flexibility of the network.            levance but also prove its economic viability. The most appropriate
     Many thermal storage options can be developed in Morocco such as           energy storage technology for a given storage situation should be
     the storage of excess renewable electrical energy in buildings (e.g.       chosen according to needs, available space and financial resource.
     domestic hot water tank). The development of district heating net-             Actually, no legislative or regulatory framework exclusively dedi-
     works in Morocco can also give a growing role to the massive               cated to the regulation of energy storage exists in Morocco. However,
     thermal storage in Morocco [60].                                           the electricity storage legislation is expected to change in order to ad-
                                                                                dress the evolutions and challenges presented by the recent dynamic of
    The principle of the above technologies has been presented in detail        energy transition in Morocco. To ensure a sustainable energy strategy in
in various articles [56,61]. Power density and energy density are two           Morocco, the implementation of energy storage solutions adapted to the
main characteristics of energy storages technologies [62]. The higher           Moroccan context is essential. As well as developing mature solutions
the power and energy density, the lower the required volume for the             such as PETSs and CSP storage [65], it is time to achieve benchmarks
storage system. So, EST can be classified according to discharge time           with new technologies such as lithium batteries and storage via hy-
[56,57,62]:                                                                     drogen [66] as part of the ambitious Power-To-X techniques in the R&D
                                                                                phase.
 • Short discharge time (seconds to minutes): SMES and FES. The en-                 The promulgation of a legislation to regulate energy storage is ne-
   ergy-to-power ratio is less than one.                                        cessary to initiate the development of new large-scale storage projects.
 • Medium discharge time (minutes to hours): FES and for large ca-              In addition, it is recommended to integrate tax incentives to encourage
     pacities, electrochemical storage systems, which is the dominant           entrepreneurship in the field of energy storage with a view to opening,
     technology: lead acid, Li-ion and sodium sulphur batteries.                through Smart Grids, the national electricity grid to the surplus injec-
 •   Long discharge time (days to months): H2 and SNG. For these EST,           tions of industrial and private owners.
     the energy-to-power ratio is greater than 10. The main advantage of
     H2 and SNG is the high energy density, superior to all other storage
     systems.                                                                   3.6. Power to X in Morocco
    PHS, CAES flow batteries systems are situated between storage                   "Power-to-X" is a way of storing electrical energy for greater flex-
systems for medium and long discharge times [53,58]. Like H2 and SNG            ibility. The excess of the available energy can be stored in other forms:
systems, these EST have external storage tanks. However, the energy             chemical or industrial products, etc. The first step of the PtX pathway
densities are rather low, which limits the energy-to-power ratio to va-         consists in using low-carbon electricity and water to produce hydrogen
lues between approximately 5 and 30.                                            by means of water electrolysis: the power-to-hydrogen (PtH) segment.
    Among all existing technologies, whether commercially available or          Hydrogen can be used immediately (e.g. as a fuel for mobility or as
under development, there is no technology that can achieve both power           feedstock in industry), or used in further synthesis steps with carbon,
and energy density at the same time. In this context, the hybridization         nitrogen or oxygen to produce chemical compounds such as methane,
                                                                                ammonia or gasoline that replace fossil fuels [50]. Fig. 9 shows the
                                                                            9
M. Boulakhbar, et al.                                                                                                  Journal of Energy Storage 32 (2020) 101806
Fig. 10. Evolution of water desalination Market between 2013 and 2020.
power to X applications [67].                                                    the photovoltaic and wind energy output of these technologies. In this
    With its geographical position and outstanding wind and solar ca-            sense, "green ammonia" will provide Morocco with opportunities to
pacity, Moroccan government is able to achieve a valuable share of the           fulfil the long-term demands of its local fertilizer industry and foreign
'Power-to-X' market expected to be between 2% and 4% of global                   market [68].
production in 2030[68]. Otherwise, economic assessment of hydrogen                   Morocco will therefore draw up a roadmap for hydrogen and PtX
production potential from solar energy in Morocco is detailed in [69].           products, a roadmap for hydrogen technology and related PtX products
    According to a study carried out by the World Energy Council                 for Morocco, and establish sustainability requirements as part of the
Germany, Morocco is among the countries with a high potential in                 hydrogen / PtX roadmap. Otherwise, several exporting industries are
terms of Power to X. Power to X requires an energy mix that allows               facing a critical situation due to the implication of the carbon tax on the
plants to run for as long as possible during the 24 hours. Solar energy          products exported by most European countries. For this reason, the
can cover about 30% of the need. If we add the contribution of wind              Moroccan industry must promptly respond to the new requirements and
power, we can reach 50%. This means that up to 70–80% can even be                constraints of the European market in which the power to X represents
achieved if storage is used. The other goal is to reach a balance between        one of the best potential solutions to promote the national economy.
the cost of hydrogen or fossil-fuel ammonia production and the cost of
                                                                            10
M. Boulakhbar, et al.                                                                                                    Journal of Energy Storage 32 (2020) 101806
3.7. Water desalination                                                             technologies and renewable sources is among the most promising ap-
                                                                                    proaches for the development of the sector [70]. During the drought
    Freshwater is a crucial factor in regional economic development.                periods in the last three decades, Morocco is facing a real issue in water
Domestic users, agriculture and industry require large quantities of                supply, due to the water demand increasing and because of the climate
freshwater. Meeting current and future demands for freshwater has                   changes [72,73]. The first desalination plants in Morocco were installed
become a serious challenge in many countries of the world [70,71].                  in 1975 to address the shortage of potable water in the southern re-
However, seawater and sometimes brackish water desalination con-                    gions, and all subsequent schemes contribute to water supplies in
stitute an important option as a very safe water source comparatively to            southern Moroccan areas that shortage fresh water and have in-
conventional water supply. Nevertheless, the world desalination market              sufficient brackish water availability [81]. Agadir's seawater desalina-
has experienced rapid expansion since the beginning of the 2000s, with              tion plant is the Africa's largest desalination station with a capacity of
growth in contracted capacity increasing by an average of 8.1% per                  275,000 m3 per day, expandable to 450,000 m3 a day. In addition, to
year [72]. Fig. 10 shows the evolution of water desalination market                 reduce production costs, the station will be coupled to a wind power
between 2013 and 2020 [73]. The current technologies of water de-                   plant. Table 9 shows more details about water desalination plants in
salination are classified into two categories, according to the principle           Morocco [81].
applied [74,75]:                                                                        Since desalination is such an energy-intensive operation, its eco-
                                                                                    nomic feasibility is directly affected by the resources needed to generate
 • Thermal processes involving a change of phases: freezing and dis-                fresh water [82]. That's why the interest in renewable energy – driven
   tillation.                                                                       desalination systems have been growing very rapidly, the number of
 • Processes using membranes: reverse osmosis and electro dialysis.                 developed plants is still limited, and the applications are primarily in
                                                                                    early stages of development [83].
    Among the above methods, distillation and reverse osmosis are                       With a huge capacity of renewable energy sources and with the
technologies with proven efficiency in desalining seawater. Indeed,                 2020 and 2030 goals, the use of the energy surplus coming from re-
these two processes are the most commercialized in the world desali-                newable sources or the alimentation of the desalination plants by re-
nation market. The other techniques have not experienced a significant              newable energy sources represent one of the most pioneer's solution to
development in the field due to problems generally related to energy                reduce the production cost in the desalination plants. Moreover, more
consumption and/or the size of the investments they require. Fig. 11                studies had been contacted by many research shows how Morocco
shows awarded membrane and thermal desalination capacity between                    could use its high potential of renewable energy sources coupled with
1990 and 2014 [73].                                                                 the desalination plants [77,84].
    Regardless of the salt-water separation process envisaged, all desa-                In Morocco, the seawater desalination market seems promised to
lination plants consist of four stages:                                             continue to grow in the coming years. However, the current technolo-
                                                                                    gies can only meet certain targeted needs concentrated in a few regions.
 • Seawater intake with a pump and coarse filtration,                               The high costs of these plants limit their dissemination throughout the
 • Pretreatment with finer filtration, addition of biocidal compounds               country, which suffers from fresh water shortages for economic reasons
   and anti-pattern products,                                                       and whose hydraulic infrastructures are generally deficient.
 • The desalination process itself,                                                     The energy consumption of desalination plants coupled with en-
 • Post-treatment with possible remineralization of produced water.                 vironmental uncertainties implies imperative technological evolutions
                                                                                    in order to support the development of this sector. Cooperation between
   At the end of these four stages, the sea water is made potable or                project developers and energy specialists makes it possible to envisage
industrially usable; it must then contain less than 0.5 g of salts per liter        the large-scale development of photovoltaic and wind-powered struc-
[76]. However, energy consumption accounts for about 41% of the total               tures.
costs of a reverse osmosis desalination plant [77]. Table 8 represents a                In the absence of an efficient distribution network and sufficient
comparative study of the energy consumption of the different desali-                financing capacities, decentralized desalination systems are more re-
nation technologies [78]. Otherwise, to minimize energy consumption,                levant than large-capacity plants to fulfil Morocco's demands.
more studies have been conducted [79,80].                                           Moreover, small-scale infrastructure would make it possible to reduce
   Several studies indicate that the combination of desalination                    the amount of investment required and reach isolated populations
Fig. 11. Awarded membrane and thermal desalination capacity, 1990–2014 [73].
                                                                               11
M. Boulakhbar, et al.                                                                                                       Journal of Energy Storage 32 (2020) 101806
    Table 8
    Comparative analysis of the energy consumption of the different desalination technologies.
      Desalination type                                      Desalination technology                                     Average Energy Consumption (kWh/m3)
Table 9                                                                                vehicles in Morocco was conducted by [90], it shows the reasons in-
Water desalination projects in Morocco.                                                fluencing the Moroccan choices of transportation modes, in particular,
  Location                Technology         Capacity m3/d               Year
                                                                                       those taken according to electric vehicles technologies. It also explores
                                                                                       potential options for incorporating this green transport style into the
  Trafaya                 ED                 75                          1975          Moroccan context, while respecting their preferences and limitations. In
  Boujdour                MED-VC             250                         1977          several studies, rechargeable electric vehicles are used in combination
  Trafaya                 BWRO               120                         1983
  Laayoun                 SWRO               7 000                       1995
                                                                                       with renewable energies at different levels of the electrical system
  Boujdour                SWRO               800                         1995          [91–93].
  Agadir                  RO                 275 000                     2021              The integration rate of electric vehicles in 2018 was estimated at
                                                                                       0.02% [94]. A literature review and prospects for sustainability about
                                                                                       adoption of electric vehicles are detailed in [95]. Otherwise, [96] de-
while reducing the energy consumption of the devices by exploiting the                 scribes the challenges and assessment of electric vehicles integration,
great potential of renewable energy in Morocco.                                        with a comprehensive analysis of political, economic, social, technical,
                                                                                       legislative and environmental aspects and rigorously assesses achiev-
3.8. Encouraging the adoption of electric vehicles                                     ability of the EV integration. Thus, electric mobility contributes to the
                                                                                       independence of imported fossil energies, constitutes a lever for the
3.8.1. Electric mobility in Morocco                                                    integration of RE in the energy mix because partial electrification of
    With over 5 million vehicles, transport sector is the pillar of                    transport encourages the installation of (decentralized) renewable en-
Moroccan economy accounts for 6% of GDP and employs 10% of the                         ergy production units, storage (V2G: vehicle to grid) and the valoriza-
urban active population. Morocco has a road network of about                           tion of surpluses for the production of hydrogen [97,98].
60,000 km of roads, 1,000 km of expressways and 1,800 km of mo-
torways [85]. However, transport is the second polluting sector in                     3.8.3. Barriers Matrix of Electric Vehicles Adoption in Morocco
Morocco and a major source of gas emissions; it is responsible for 15%                     Based on an in-deep analysis of the current electric mobility situa-
of total emissions of the kingdom. The major problem is that the                       tion and on data collected from electric mobility actors in Morocco,
transport sector absorbs 35% of national energy consumption including                  barriers of electric vehicles adoption are categorized on three major
50% of petroleum products [86]. For these reasons and because of the                   elements. Table 10 presents the matrix of these barriers.
transport remains an essential link in the development of the country's
economy, the interest in electric vehicles has increased in recent years               3.8.4. Recommandations
in Morocco. Many automobile manufacturers have installed in the                            Morocco expects a real growth in electric-vehicle sales in coming
kingdom at this point developed and commercialized their first modern                  years. However, the market is currently in a period of transition, as
electric models, proving that the electric drive is technically viable,                companies and cities scale up to meet the demands. The demand for
environmentally friendly and affordable and it's a better solution in                  electric vehicles comes with a few factors that require collaboration
order to improve Moroccan economy. As well as the renewal of the                       between cities and car owners. Research agencies, vehicles manu-
state's vehicle fleet with electric and hybrid vehicles are one of the first           facturers and operating entities are encouraged to maximize electric
measures that the government intends to put in place as part of the                    vehicles adoption based on local conditions, and to develop responsi-
kingdom's 2030 sustainable development strategy. Clean cars should                     bilities for implementation. Fig. 14 shows the four key elements for a
make up 30% of the fleet by 2021 [87]. Meanwhile, the deployment of                    successful transformation for EV adoption acceleration in Morocco.
a strong charging infrastructure is the backbone of the electric vehicle                   A voluntarist policy of the government, through concrete actions
adoption. Through IRESEN, Morocco has started some initiatives to                      and subsidies aimed to encourage consumers to buy green vehicles at
encourage the development of electric mobility. The example is the                     competitive prices, are the main acts allowing the development of
Green miles project that focuses on the installation of 74 charging                    electric mobility in Morocco. Finally, it is necessary to ensure the
points to cover more than 600 km highway. Furthermore, the im-                         compatibility of charging, communication, and billing and payment
plementation of 2 charging units coupled to photovoltaic panels in                     systems and to adapt them to the Moroccan context.
Rabat City [88]. Fig. 12 and Fig. 13 represent respectively the evolu-
tion of charging pools number in Morocco between the last trimester of                 3.9. Energy efficiency
2018 and the second trimester of 2020 and the distribution of plugs by
charging speed [89].                                                                       According to the national energy strategy adopted at the end of
                                                                                       2008, energy efficiency is considered a key element of economic and
3.8.2. Electric mobility and renewable energies                                        social progress [99]. In this context, a number of measures to save
    Transport always goes with energy, and the major question is where                 energy and control energy consumption in various sectors (industry,
the energy needed comes from? Otherwise, given the impact of trans-                    buildings, agriculture, public lighting and transport) have been adopted
port on the consumption of fossil fuels and greenhouse gas emissions,                  in Morocco.
the implementation of a policy allowing the development of electro                         To support energy efficiency programmes, Law 47-09 on energy
mobility in Morocco represented an important fraction of the renewable                 efficiency was published in 2011 [100]. It focuses on energy audits,
energy objectives. In this context a socio-economic study of electric                  energy impact studies, energy performance in several sectors,
                                                                                 12
M. Boulakhbar, et al.                                                                                                    Journal of Energy Storage 32 (2020) 101806
rationalisation of the energy used by public establishments and local             must promote energy efficiency, the reduction of greenhouse gas
authorities, the creation of the status of energy service companies and           emissions, the reduction of fossil fuel consumption and the deployment
the introduction of technical controls for audits by accredited compa-            of renewable energies.
nies. The new thermal building regulation, which defines energy per-                  Different instruments can be implemented locally in each region to
formance rules in Buildings, was drafted in 2014. In 2019, the energy             achieve the 2030 energy efficiency targets and accelerate the transition
audit of industries is mandated.                                                  to a more energy-efficient society:
    The goals for energy efficiency, which have been adjusted from
2009′s initial ambition, are now 5% by 2020 (compared to 12% in-                   • Assess the potential of energy savings, renewable energy and heat
itially) and 20% by 2030 [99,101]. This delay in implementing the                      recovery in each region [102]. Waste heat recovery can lead to two
energy efficiency objectives is due to the positioning of the AMEE                     complementary heat valorisation processes [103]:
(Moroccan Agency for Energy Efficiency), its organisation and the lack                 ■ Internal valorization, to meet the heat needs in the company;
of human and financial resources needed to carry out this important                    ■ External valorization, to meet the heat needs of other companies
project. Current analysis of Morocco's energy sector reveals that there is                or, more generally, of a region, via a district heating network. In
significant potential for additional energy savings in the country [99].                  addition to thermal recovery, the heat can also be transformed
    We consider that the success of the energy transition policy in                       into electricity, for internal or external use.
Morocco can only be achieved through local authorities (Region,                    •   Reducing energy consumption: in particular, by improving the
Municipalities and Communes), which are in the first line to apply and                 thermal isolation of public buildings, switching off public lighting
adapt the national objectives in terms of energy efficiency to the local               after a certain period, promoting car sharing as well as clean and
context. Local and regional authorities should be committed to a pro-                  collective transport, mutualising facilities, encouraging local pro-
cess of achieving a balance between energy consumption and produc-                     duct, etc.
tion at local level by reducing energy needs as far as possible and re-            •   Development of renewable energies: for example, through a regional
specting the national energy system's equilibrium. In their policies, they             programme for the installation of photovoltaic panels on public
                                                                             13
M. Boulakhbar, et al.                                                                                                                        Journal of Energy Storage 32 (2020) 101806
Table 10
Barriers matrix.
                    Vehicles                                                   Agencies and operators                             Grid and charging infrastructures
  Institutional     • Difficulties for manufacturers in engaging with cities   • Negative public perception                       • Limited planning for long-term implications
                    and e-mobility actors                                      • Weak governmental coordination                   • Lack of law of energy integration in Law voltage
                    • Targeted policies toward sustainable urban transport     • Not enough policies supporting the adoption of
                    are still quite limited                                    electric vehicles
  Financial         • Lack of financing options                                • Scaling investment past initial pilot programs   • Large capital expenses for grid infrastructure
                    • High upfront capital costs of electric vehicles          • Strong financial management and business
                                                                               models
  Technological     • Range and power limitation of electric vehicles          • Lack of information on how to start              • Limitations of the charging stations
                    • Disjointed or limited electric vehicles marketplace      • Lack of operational data                         • Grid instability
                    • Lack of information on advantages and disadvantages                                                         • Lack of standards and regulations on charging
                    of electric vehicles.                                                                                         infrastructures
                                                                                                                                  • Lack of understanding of the requirements to
                                                                                                                                  upgrade infrastructure
     buildings, the implementation of district heating networks in-                             renewable energy technology, and helping to develop a local manu-
     tegrating renewable energies in new urban areas, etc....                                   facturing industry.
 •   Implement a thermal renovation program for existing residential                                MASEN and IRESEN are responsible for implementing R&D projects
     buildings, and integrate the issue of environmental quality into this                      and identify strategic topics to guide the R&D and create a real and
     program.                                                                                   concrete research map. IRESEN is a network of applied research plat-
 •   Development of Eco-neighbourhoods.                                                         forms at the service of researchers and innovation actors. Based on the
 •   Environmental education: by promoting awareness in schools, en-                            implementation of current projects, IRESEN will have to assess the
     couraging information for residents...                                                     progress, priorities and organization of R&D governance in order to
                                                                                                ensure the success of Morocco's energy transition for 2030.
   Other measures are needed at the national level to ensure that en-                               Continued support is needed for universities and educational cen-
ergy efficiency can fully contribute to the energy transition in Morocco:                       tres to ensure that students, scientists and operators are informed and
                                                                                                trained in RE technologies. To this end, it is recommended that re-
■ Establishment of a national energy efficiency fund.                                           search, education and training in RE be included in the legislative
■ Implement norms and financial mechanisms to support energy ef-                                framework and educational policies. In addition, it becomes necessary
  ficiency policies.                                                                            to strengthen the coordination of energy technologies and R&D be-
■ Reinforcing the expertise, the human and the financial resources of                           tween different agencies, universities and government in order to avoid
  the AMEE.                                                                                     duplication of activities and to develop stronger synergies between
■ Creation of an AMEE office at the level of each region. The covid 19                          industry and universities.
  sanitary crisis that recently affected the entire world has clearly
  revealed the necessity to develop locally an economic, energy and                             4. Conclusion
  social policy in relation to the specificities of each region.
■ A legislative framework to regulate and control the conformity in                                 Morocco has made the transition to renewable energy a high
  terms of quality and safety must govern renewable energy equip-                               priority since the 2009 national energy strategy. After 2020, the
  ments introduced in the national market.                                                      Moroccan government has set an ambitious long-term target for re-
■ National competence and expertise must also be created to develop                             newable energy by reaching 52% of total installed capacity by 2030, by
  testing laboratories to facilitate the study and certification of energy                      taking advantage of the country's high potential conditions for wind
  equipments and regional construction materials.                                               and solar power in addition to the contributions of hydropower, thus
                                                                                                demonstrating a clear long-term commitment. However, Morocco must
3.10. Innovation and Energy R&D                                                                 implement several measures and strategies in order to achieve the
                                                                                                ambitious target of 2030. Among these measures: the modernization of
    Morocco has outstanding RE prospects, including solar, wind and                             the electricity network with the introduction of intelligent metering and
biomass technologies. Such technologies have different needs in terms                           analysis systems, the development of regional and international inter-
of support for research and development, demonstration and market                               connections and the promotion of energy storage.
development [104]. Moreover, innovation remains an important link                                   Otherwise, the kingdom must complete the regulatory framework
for a wide integration of these technologies [105]. The energy research,                        for open and transparent access to low-voltage grid, including through
development and innovation policies remain mandatory to enhance the                             harmonized permitting, and tariff structures. It is urgent for policy-
Morocco's ambitious energy policy priorities, boosting the use of                               makers to explore possibilities for developing the "power to x" concept
Fig. 14. Key elements for a successful transformation for EV adoption acceleration in Morocco.
                                                                                           14
M. Boulakhbar, et al.                                                                                                                          Journal of Energy Storage 32 (2020) 101806
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interests or personal relationships that could have appeared to influ-
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