Energy storage is not a new concept; it has always been an integral part of energy supply systems. From hydroelectric storage and fossil fuel depots, such as underground gas and liquefied natural gas (LNG), to thermal energy storage and modern batteries, the various storage technologies play a vital role in demand management and the optimization of energy resources.
The need for energy storage systems (ESS) at different scales, durations and applications is increasingly fundamental for a cleaner, more efficient and sustainable energy future, and its importance has been accentuated by the growing penetration of renewable energies in the global energy mix.
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Short-life energy storage systems (ESS) , such as lithium-ion batteries and supercapacitors, are ideal for applications requiring rapid energy release , such as renewable energy production stabilization, grid frequency and voltage regulation, and congestion management. Long-life ESS, on the other hand, such as pumped hydro storage, molten salt systems, and flow batteries, are capable of storing large amounts of energy for extended periods and can be a reliable energy source during periods of low renewable energy production.
Electric vehicles (EVs) , whose adoption is rapidly increasing, are essentially also mobile energy storage units that can, in addition to consuming energy, return it to the grid (V2G), thus providing flexibility services.
In this article, we will explore how modern energy storage systems are revolutionizing energy markets. We will analyze the main storage technologies available, their applications and benefits, as well as the challenges they face in integrating them into energy systems, and the strategies needed to overcome these obstacles.
Types and Characteristics of Modern ESS
A widely used approach to classifying ESS systems is according to the form of energy they use. These systems are thus classified into five main groups: mechanical, electrochemical, chemical, electrical, and thermal storage.
1. Mechanical Storage
The most common mechanical storage systems are reservoir hydroelectric power plants (HS) and pumped hydro storage (PHS), compressed air energy storage (CAES) and flywheel energy storage (FES).
- Hydropower and Pumped Hydro: These systems store energy in the form of water (potential energy), releasing it when needed to generate electricity. It is a mature and proven gravitational energy storage technology, but it requires specific geographic locations.
- Compressed air: This system stores energy by compressing air in a tank. It is a relatively new technology that is gaining popularity due to its low cost and scalability, but it is still under development.
- Flywheel: Flywheels store kinetic energy in a rotating rotor. They are suitable for applications requiring rapid energy discharges, such as voltage support in the grid. It is a mature and reliable technology for short-duration applications, but with lower storage capacity than other technologies.
- High Blocks: This is a method for storing potential energy by lifting a heavy object to a great height and then releasing that potential energy when needed. The potential energy is converted into kinetic energy as the object descends and can be used to generate electricity or perform other work.
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2. Electrochemical Storage
Electrochemical energy storage encompasses a wide range of technologies that enable the conversion of electrical energy into chemical reactions and vice versa. Some examples include:
- Lithium-Ion Batteries: Lithium-ion batteries are one of the most common and widely used modern energy storage technologies in portable, automotive, and stationary applications. They offer high energy density, long cycle life, and fast charging times, making them ideal for a variety of short-term applications, from electronic devices to electric vehicles and residential energy storage systems.
- Solid-State Batteries: This is a promising advancement in battery technology that replaces the liquid electrolytes of conventional lithium-ion batteries with solid materials. They can operate at higher temperatures and offer greater safety, improved energy density, and faster charging times compared to traditional batteries. Although still in the development and commercialization stages, solid-state batteries are expected to play a crucial role in the future of short-duration energy storage.
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- Flow Batteries: These batteries store energy in chemical solutions held in separate tanks. Energy is generated through chemical reactions between the electrolytes when connected to a load. They are highly scalable and suitable for large-scale, long-duration stationary energy storage applications, such as grid stabilization and renewable energy backup.
- Metal-air batteries: These batteries use a metal as the anode and oxygen from the air as the cathode to generate electricity. They are known for their high energy density and potential for electric vehicle applications and large-scale energy storage. However, they face challenges in terms of durability and efficiency, especially in humid or corrosive environments.
3. Chemical Storage
Chemical energy storage refers to the technology that allows energy to be stored in the form of chemical bonds between molecules. This energy can come from various sources, such as electricity or heat, and can be released later to generate electricity, heat, or power vehicles. Chemical energy storage is the only technology that allows large amounts of energy to be stored, up to the TWh range, and for extended periods, even as seasonal storage. Here are some notable examples:
- Synthetic Natural Gas (SNG): Energy storage in the form of synthetic natural gas is a technology that allows electrical energy to be stored as a gas , using a process called methanation . This process combines hydrogen and carbon dioxide to produce SNG, which can be stored and transported similarly to conventional natural gas.
- Hydrogen: Energy storage in the form of hydrogen involves producing hydrogen through methods such as water electrolysis or natural gas reforming, which can then be stored and/or used in fuel cells to generate electricity when needed. Although hydrogen storage faces challenges in terms of efficiency and infrastructure costs, it is considered a promising option for large-scale storage and transportation of renewable energy.
Hydrogen and natural gas products (NGPs) have great potential to transform the global energy system. Their versatility and ability to decarbonize multiple sectors make them key technologies for achieving climate neutrality. However, current challenges must be overcome to achieve large-scale adoption.
4. Electrical Storage
Electrical energy storage refers to technologies that store energy in the form of electricity and release it when needed. These technologies are typically for short-term applications. Some of the most prominent technologies in this field include:
- Supercapacitors: These devices store energy in an electric field and are capable of rapid charging and discharging. They are ideal for applications requiring short but intense bursts of energy, such as kinetic energy recovery in electric vehicles or compensating for load fluctuations in the electrical grid.
- Double-layer capacitors: Also known as electrochemical capacitors, these store energy at the interface between a solid and a liquid or between two polarized liquids. They are highly efficient in terms of charging and discharging, but have a relatively low storage capacity compared to other electrical energy storage technologies.
- Supercapacitors: These devices combine characteristics of batteries and capacitors, offering high energy density along with fast charge and discharge capabilities. They are suitable for applications requiring intermediate energy storage and extended lifecycles, such as backup power systems and small-scale renewable energy storage.
5. Thermal Storage
Thermal energy storage involves converting electrical or mechanical energy into heat, which is then stored and can be used to generate electricity or for heating and cooling applications. These technologies are generally well-suited for long-term applications. Some prominent technologies in this field include:
- Hot Water Tanks: This is a simple and economical method of storing thermal energy, where heat is stored in large, insulated water tanks. It is commonly used in solar heating systems and as a supplement to intermittent renewable energy systems.
- Molten Salts: Molten salts are used in concentrated thermal storage systems, where heat is stored as latent thermal energy. They are capable of retaining high temperatures for extended periods, making them suitable for concentrated solar power generation and large-scale energy storage systems.
- Phase Change Materials (PCMs): These materials store and release thermal energy during phase transitions, such as solidification or melting. They are especially useful in applications requiring precise temperature control, such as building climate control systems and the food and beverage industry.
Energy Storage Applications
ESS applications span a wide range of sectors, from industry to transportation and power generation. Some of the main applications of this technology are explored below:
1. Integration of Renewable Energies
One of the most significant applications of energy storage is its ability to facilitate the integration of renewable energy sources, such as solar and wind, into the electrical grid. These sources are intermittent, meaning their availability varies in real time depending on the resource’s behavior. Energy storage allows for the modulation of renewable production, making it easier to forecast, and also captures excess energy during periods of high generation for use when demand is higher or production is low, thus ensuring a stable and reliable supply of clean energy.
2. Auxiliary Services
Energy storage systems (ESS) also play a crucial role in providing ancillary services to the electricity grid. These services include frequency and voltage regulation, as well as operating reserve, which are essential for maintaining the stability and reliability of the electrical system. Storing energy and releasing it quickly according to grid needs helps maintain a balance between electricity supply and demand.
3. Quality of Service and Energy Backup
ESSs offer a fast and reliable solution to ensure the quality and continuity of services by acting as a dependable backup power source similar to UPSs (Uninterruptible Power Supplies). By providing an uninterrupted power supply, ESSs are vital for sectors such as healthcare, communications, and security, where power availability is essential.
4. Demand Management and Demand Response
Energy storage allows for managing electricity demand by storing energy during periods of low demand and releasing it when demand is high. This demand responsiveness helps balance the load on the electrical grid in real time, which can reduce the need to build new generation and/or transmission infrastructure to meet temporary demand peaks. Furthermore, it contributes to energy efficiency and the optimization of resource use. For example, energy storage systems (ESS) installed at nodes near consumption centers can control energy flow and mitigate congestion, making them a cost-effective alternative to building new transmission and distribution networks. Their implementation time and space requirements are significantly lower than those of developing new networks.
5. Market Share
Energy service providers (ESS) have the capacity to participate in modern electricity markets as a new market participant, buying and selling electricity according to market conditions. This flexibility allows them to capitalize on fluctuations in electricity prices and maximize their market value. Furthermore, they contribute to price stabilization and the optimization of available energy resource use.
6. Vehicle-to-grid (V2G)
This application is a classic example of mobile and distributed ESS. With a sufficient fleet of EVs connected to the grid, these can function identically to stationary ESS, but with the following advantages:
- Simple Grid Connection : Electric vehicles connect to the distributed grid without the need to go through long and tedious administrative processes, making their integration and deployment easier compared to traditional stationary ESS.
- Battery Revolving Fund : With a large number of individually owned batteries, EVs can act as a perpetual revolving fund. This means the batteries are constantly recharged as they are used, ensuring a continuous source of energy storage.
- Rapid Response to Network Failures : Electric vehicles connected to the grid can provide a rapid response in the event of power outages or problems on the local network. This immediate response capability is crucial for the stability of the electricity supply in emergency situations.
- Generating Value for Idle Fleets : EVs that are in daily or seasonal stoppages, such as school bus fleets, can generate additional cash flow by selling stored energy back to the grid during these periods of inactivity. This not only improves the economic efficiency of the vehicles but also supports the stability of the electricity grid.
Challenges for ESS integration
The effective integration of modern energy service systems (ESS) into electricity markets presents a series of complex challenges, ranging from technical and operational aspects to regulatory and financing issues. The main challenges these systems currently face are detailed below:
1. Regulation and Policies
- Inadequate Regulatory Framework : Current regulatory frameworks in many countries are not adapted to integrate energy and service providers (ESS) into electricity markets. In many cases, regulations do not fully recognize the value that ESS can bring, such as their ability to operate as a multi-service resource , providing ancillary services, flexibility services, demand management services, grid stability, and more.
- Administrative Barriers : The administrative and bureaucratic processes for connecting and operating ESS on the grid can be lengthy and complex, discouraging their deployment. The lack of specific regulations for grid connection, operation, and compensation for services provided by ESS creates an uncertain environment that limits the growth of these technologies.
2. Network Integration
- Energy Management and Cybersecurity : Large-scale integration of energy storage systems (ESS) increases the complexity of energy management within the grid, requiring advanced energy management systems to optimize ESS usage in real time. Furthermore, cybersecurity becomes crucial to protect storage systems and prevent disruptions or malicious manipulation.
- Network Capacity : The capacity of the current network infrastructure to handle the massive integration of energy storage systems (ESS) is another critical challenge. The necessary upgrades to the transmission and distribution infrastructure to support bidirectional energy flow, especially in vehicle-to-grid (V2G) applications, may require significant additional investment. Examples of this include Japan and Australia, where the integration of large amounts of energy storage into the grid has necessitated upgrades to transmission and distribution infrastructures, presenting them with considerable economic and technical challenges.
3. Costs and Financing
- High Investment and O&M Costs : Despite technological improvements and cost reductions in some areas, ESS implementation still represents a significant investment. The costs associated with manufacturing, installing, operating, and maintaining ESS can be high, especially for large-scale or long-life storage technologies, which limits their widespread adoption.
- Business Models and Financing : The lack of clear and sustainable business models for ESS can hinder access to financing. Investors and funders typically require a clear and predictable return on investment (ROI), which can be challenging given the variable nature of revenues that can be generated from ESS, such as those derived from participation in ancillary services markets, demand management, or energy arbitrage.
4. Markets and Participation
- Market Limitations : Energy Service Companies (ESS) often face barriers to full participation in electricity markets. The lack of market mechanisms that recognize and value all the benefits ESS can offer, such as improved efficiency, faster response times, enhanced stability, and reduced network costs, limits their development and integration.
- Price Volatility and Financial Risks : The participation of energy service providers (ESS) in energy and ancillary services markets is often subject to the volatility of electricity prices. This volatility introduces financial risks that increase the difficulty of planning and operating ESS.
5. Technological Development and Life Cycle
- Innovation and Technological Development : While energy storage technologies have advanced significantly, many are still in early stages of development or require improvements in efficiency, durability, and cost. Continued research and development are necessary to overcome current technical limitations and make ESS more competitive.
- Environmental Impact and Life Cycle : While energy storage systems (ESS) are essential for a sustainable energy transition, their environmental impact and management throughout their life cycle also present challenges. This includes the extraction of raw materials, production, and eventual recycling or disposal of storage components, such as batteries. Minimizing environmental impact and maximizing sustainability throughout the entire life cycle of ESS are crucial for their responsible adoption in any energy system. This is an aspect that is often overlooked when designing regulatory frameworks and policies to facilitate their adoption.
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6. Interoperability and Technical Standards
- Lack of Uniform Standards : Interoperability between different types of energy storage systems (ESS) and with other components of the electrical grid requires the development of uniform technical standards. Without these standards, the integration of different storage technologies and their joint operation may be compromised in the medium and long term, potentially affecting the stability and security of the energy system.
- Safety and Reliability : Energy storage, especially in emerging technologies such as solid-state batteries or hydrogen, can pose safety challenges. It is essential that rigorous standards be established to ensure that these types of ESS operate safely and reliably, minimizing the risks of technical failures, fires, or explosions.
Strategies for Effective Integration
To achieve effective integration of energy and social economy (ESS) systems into energy markets, well-defined strategies are needed to address technical, regulatory, financial, and market challenges. Below are some of the main strategies that can facilitate this process:
1. Modernization and Flexibility of Regulation
Modernizing and streamlining regulations is essential for effectively integrating energy and social economy (ESS) into energy markets. This includes updating regulatory frameworks to recognize the value of ESS, using regulatory sandboxes , and adopting flexible regulations that adapt to rapid technological evolution.
- Regulatory Framework Review : It is crucial to update regulatory frameworks to recognize the multifaceted value of energy and social service (ESS), enabling their full participation in energy markets. Regulations should facilitate grid connection, simplify administrative processes, and ensure fair compensation for the services ESS provide.
- Agnostic and Dynamic Regulation : The new regulations must be agnostic and flexible to adapt to the rapid evolution of storage technologies, allowing market forces to dictate the specific technologies adopted. The new regulations must also allow for rapid adjustments in the future to address new challenges and opportunities that may arise as the sector develops.
- Regulatory Sandboxes . In the context of energy and social economy (ESS), regulatory sandboxes can be vital for exploring how these technologies interact with electricity grids and energy markets before final regulations are implemented. This facilitates the early identification and resolution of regulatory and technical barriers, fostering a smoother integration of ESS into the market.
Regulatory sandboxes are controlled environments where companies can test innovations under real-world conditions, within a flexible and temporary regulatory framework. These spaces allow regulators and companies to experiment with new technologies and business models without being subject to all the usual regulations.
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2. Support and Incentive Policies
One of the key factors in promoting the adoption of energy storage systems (ESS) is the implementation of policies that provide direct and indirect support and incentives. By guaranteeing remuneration for the technology or reducing initial investment and operating costs, storage projects become more attractive to both public and private investors.
- Market mechanisms: It is crucial to develop mechanisms in energy markets that recognize and reward energy service providers (ESS) for their multiple services, enabling these technologies to integrate competitively. These mechanisms may include participation in active energy markets, ancillary services, flexibility, and capacity.
- Direct and Indirect Incentives: In addition to market mechanisms, governments can implement a variety of direct and indirect incentives to encourage the adoption of social and solidarity economy (SSE) schemes, such as:
or Subsidies: Reduction of initial investment costs.
or Tax credits: Tax incentives to reduce O&M costs.
or Financing programs: Financing facilities at preferential rates.
Regulatory requirements : Utility companies are obligated to include a certain amount of storage in their portfolios. For example, in some markets, companies developing large-scale solar or wind projects must include a certain amount of energy storage capacity to connect to the electricity grid.
The cost per kWh of these systems, although it has decreased, remains a determining factor in investment decisions . For example, a modest-sized 5 MW/20 MWh (4-hour) commercial-scale lithium-ion battery energy storage system (BESS) requires a capital investment of approximately $5.5 million at the current price of ~$275/kW. Given the high capital intensity of these technologies, the ability to successfully finance projects is one of the key factors determining whether they can be built.
3. Infrastructure Development and Technical Standards:
The electricity transmission and distribution infrastructure must be prepared to handle the integration of ESS, which requires technological upgrades, expansions and the development of standards.
- Network Infrastructure Upgrade : Investing in the modernization of transmission and distribution infrastructure is essential to efficiently manage the bidirectional energy flow required by energy service solutions (ESS) and applications such as V2G. This includes installing advanced energy management systems and improving cybersecurity.
- Establishing Uniform Standards : Develop and adopt technical standards that ensure interoperability between different ESS technologies and other components of the electrical grid. These standards should include aspects of safety, reliability, and operational efficiency to ensure the safe and effective integration of ESS into the energy system.
4. Collaboration and Sectoral Alliances
The effective integration of energy storage systems (ESS) requires close collaboration among the various stakeholders in the energy sector, including regulators, grid operators, technology companies, investors, and governments. These partnerships can help share knowledge, reduce costs, and ensure that storage technologies are deployed efficiently and in a coordinated manner.
- Public-Private Partnerships (PPPs) : Promoting collaborations between the public and private sectors can accelerate the development of critical infrastructure for integrating social and solidarity economy (SSE) systems. These partnerships can facilitate financing, knowledge sharing, and the implementation of large-scale pilot projects.
- International Cooperation : Participate in international alliances and consortia to share best practices, standards, and emerging technologies. This not only drives the adoption of ESS but also harmonizes regulations and facilitates interoperability globally.
5. Market Education and Awareness
A key aspect for the successful adoption of this technology is raising awareness about the benefits of energy-efficient systems (ESS) and their market potential. This can be achieved through awareness campaigns and training programs for industry professionals and the general public, which will accelerate the adoption of these technologies.
- Training and Capacity Building : Invest in training engineers, technicians, and network operators in new ESS technologies and their effective management. Proper training is crucial to maximizing efficiency and minimizing the risks associated with operating these systems.
- Public and Business Awareness : Fostering a greater understanding of the benefits of ESS among consumers, investors, and businesses. Increased awareness can drive demand and support the widespread adoption of these technologies in the market.
6. Investment in Research and Development (R&D)
Technological advancement is essential to overcoming current challenges in terms of cost, efficiency, and lifespan of energy-efficient systems (ESS). Investment in R&D allows for the optimization of emerging technologies, making them more accessible and competitive in the long term.
- Promoting Innovation : It is vital to continue investing in research and development of new energy storage technologies that are more efficient, durable, and lower cost. This includes everything from improvements to solid-state batteries to the optimization of systems such as hydrogen storage and the use of supercapacitors.
- Pilot Projects and Field Tests : Supporting and funding pilot projects allows for the testing of new technologies under real-world conditions, facilitating the identification of practical obstacles and the adjustment of technologies before large-scale implementation.
Case Study: ESS Remuneration in CAISO
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The development of energy storage systems (ESS) in California has been driven by the need to support the high penetration of variable renewable energy generation in its market. ESS projects in California can be grouped into two categories, depending on how they are considered by the California Independent System Operator (CAISO) for operation and remuneration purposes:
- Market resources that provide a local reserve of capacity, known as resource adequacy (RA), to ensure the safe and reliable operation of the system by the CAISO.
- A transmission asset , approved through the CAISO transmission plan
1. Market Resources (Energy Storage & Distributed Resources – ESDER)
In this case, projects are approved through procurement processes by the California Public Utilities Commission (CPUC) or other regulatory entities. In this regard, development targets for storage projects were set for the three main investor-owned transmission and distribution (T&D) companies, also known as investor-owned utilities (IOUs). The remuneration for availability (RA) consists of a fixed payment, which the CPUC recognizes and approves for the IOUs based on agreements reached during these bidding processes. Participants in the processes suggest a project ownership structure, with two possible options:
- Utility – owned: The bidder builds the project, but ownership and management of it is the responsibility of the IOU.
- Third-party owned: The bidder builds, operates, and maintains the project for a defined contractual period. Ownership of the energy service (ESS) is transferred to the successful bidder, who, in addition to receiving the fixed RA payment, typically enters into a power purchase agreement (PPA) with the IOU for a fixed capacity to offload during peak demand hours. Alternatively, the ESS owner can participate in the short-term market to conduct energy arbitrage without signing bilateral contracts.
For ESSs participating in markets, an opportunity has been identified to additionally participate in RSF or AGC markets, although this is not the primary application. CAISO remunerates the RSF service as the sum of three components (Byrne et al., 2018):
- Capacity dispatched for RSF, at the marginal RSF market price
- Energy supplied by the activation of RSF service, at the market price.
- Performance (response to CAISO AGC signal)
2. Storage as Transmission Asset (SATA)
Since 2014, CAISO has established a methodology for considering the use of wireless and distributed generation alternatives to address transmission needs. In the annual transmission planning process, Energy Support Services (ESS) projects are proposed as alternatives to the construction or upgrading of transmission and distribution (T&D) networks to alleviate congestion and overloads, and to generally improve the reliability of T&D systems. Approved projects are considered transmission assets, and their remuneration consists of a regulated revenue based on cost recovery. These ESS are dedicated to transmission support services, and their operation is managed by CAISO; therefore, they are not eligible for applications in energy markets or ancillary services. Mechanisms are currently being explored to allow these ESS to participate in market services. The objective is to reduce taxpayer contributions to the regulated cost remuneration of the projects.
Future Perspective of the ESS
Modern energy storage systems (ESS) will play an increasingly central role in the transformation of energy systems. The convergence of technologies such as batteries, green hydrogen, natural gas turbines (NGTs), molten salts, and pumped hydro storage systems will enable the creation of more efficient and flexible storage solutions. Furthermore, digitalization and artificial intelligence will optimize the management of ESS and their integration into smart grids.
Innovative business models, such as demand aggregators and peer-to-peer energy trading platforms, will facilitate the participation of energy service providers (ESS) in energy markets and generate new revenue streams. ESS will also play a key role in building local energy communities and improving the resilience of electricity grids.
Long-term energy storage will be essential to achieving high levels of renewable energy penetration. Without adequate anticipation, increased installation of renewable energy sources could lead to a shortage of thermal generators for power control, causing short-term system instability. This will necessitate the large-scale implementation of energy storage systems (ESS) to maintain grid stability and reliability.
In the future, energy social enterprises (ESS) will transform the energy sector by enabling broader integration of renewable energy, improving grid flexibility, and fostering greater consumer participation in the energy market. Furthermore, they will facilitate the transition to a more sustainable and resilient energy system, capable of adapting to changing demands and the challenges of climate change.
Conclusions
In today’s world, the efficiency and sustainability of electrical systems increasingly depend on modern energy storage systems. These systems are crucial for managing the intermittency of renewable energy sources and reducing the use of fossil fuels. Furthermore, they offer value-added services that strengthen the smart grid of the future, which demands advanced technologies capable of managing complex, bidirectional energy flows. Distributed energy storage systems in businesses, homes, and buildings are actively participating in modifying energy consumption patterns by monitoring their consumption in real time.
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Energy storage (ESS) technology is evolving rapidly. Advances in research and development are leading to more efficient, cost-effective, and durable systems, which will continue to open new opportunities for integrating renewable energy, improving grid reliability, and reducing carbon emissions.
However, to fully realize the potential of energy sustainability initiatives (ESS), it will be necessary to address all the challenges associated with their adoption. Collaboration among stakeholders, the establishment of appropriate regulations and public policies, and continued investment in research and development will be fundamental to accelerating the adoption of these technologies and building a more sustainable and equitable energy future.
References
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The state of battery storage (BESS) in Latin America: A sleeping giant wakes up. https://americasmi.com/insights/opportunities-battery-storage-bess-latin-america/
Overview of Energy Storage Technologies Besides Batteries https://link.springer.com/chapter/10.1007/978-3-031-48359-2_4
Emerging Battery Technologies to Boost the Clean Energy Transition https://link.springer.com/book/10.1007/978-3-031-48359-2
Integration of energy storage into electrical systems: international experiences in regulatory models – November 2023 https://publications.iadb.org/es/incorporacion-de-almacenamiento-de-energia-en-los-sistemas-electricos-experiencias-internacionales