Contenido

La mayoría de los sistemas BESS están compuestos por paquetes de baterías sellados de forma segura, que se monitorean electrónicamente y se reemplazan una vez que su rendimiento cae por debajo de un umbral determinado. Las baterías sufren envejecimiento cíclico, o deterioro causado por los ciclos de carga y descarga. Este deterioro es generalmente mayor a tasas de carga elevadas y a mayor profundidad de descarga. Este envejecimiento provoca una pérdida de rendimiento (disminución de capacidad o voltaje), sobrecalentamiento y puede eventualmente provocar un fallo crítico (fugas de electrolito, incendio, explosión). A veces, las centrales eléctricas de almacenamiento de baterías se construyen con sistemas de almacenamiento de energía mediante volante de inercia para conservar la energía de la batería,

se utiliza el volante para suavizar el flujo de energía entre una fuente de potencia y su salida. Los volantes de inercia pueden manejar fluctuaciones rápidas mejor que las plantas de baterías más antiguas.

Las garantías BESS generalmente incluyen límites de por vida en el rendimiento energético, expresados como número de ciclos de carga y descarga. [12]​.

Lead-acid batteries

Lead acid batteries are first generation batteries and were generally used in older BESS systems. [13] An example is a battery of 1.6 MW peak and 1.0 MW continuous capacity that was put into service in 1997. Compared to modern rechargeable batteries, lead-acid batteries have a relatively low energy density. Despite this, they are capable of supplying high surge currents. However, unsealed lead-acid batteries produce hydrogen and oxygen from the aqueous electrolyte when overcharged. It is necessary to refill the water tank periodically to avoid damaging the battery and flammable gases must be evacuated to avoid risks of explosion. However, this maintenance has a cost, and recent batteries such as Li-ion do not have that problem.

Lithium-based batteries

Lithium-ion batteries are designed to have a long life without requiring maintenance. They generally have high energy density and low self-discharge.[15]​ Due to these properties, most modern BESSs are lithium-ion based batteries.[16]​.

A disadvantage of some types of lithium-ion batteries is fire safety, especially those containing cobalt.[17] The number of BESS incidents has remained around 10 to 20 per year (mainly during the first 2 to 3 years of age), despite the large increase in the number and size of BESS. Therefore the risk function has decreased. Failures occurred mostly in system checks and balances, while 11% occurred in cells.[18]​.

Examples of BESS fire accidents include individual modules at 23 battery parks in South Korea between 2017 and 2019, [19]​ a Tesla Megapack in Geelong, [20]​ [21]​ the fire and subsequent explosion of a battery module in Arizona, [22]​ and the Moss Landing LG battery fire and coolant short circuit incidents. [23]​ [24]​.

This has led to more research in recent years into mitigation measures for fire safety. [25]​.

In 2024, lithium-ferrophosphate (LFP) battery became another important type for large storages due to its high component availability, longer lifespan, and improved safety compared to nickel-based lithium-ion chemistries. of 2024, without any security incident. [27]​.

Sodium based batteries

Alternatively, sodium ion batteries are increasingly used in BESS. Compared to lithium-ion batteries, sodium-ion batteries have slightly lower cost, better safety features, and similar power delivery characteristics. However, it has a lower energy density compared to lithium-ion batteries.[28]​ Its operating principle and cell construction are similar to those of lithium-ion batteries (LIB), but lithium is replaced by sodium as the intercalating ion.[29]​ Some sodium-based batteries can also operate safely at high temperatures (sodium-sulfur battery). Some notable sodium battery producers are CATL, Faradion Limited, HiNa Battery Technology, Northvolt, Altris AB, and Tiamat.[30] Sodium-based batteries are not yet fully commercialized. The largest BESS using sodium ion technology began operations in 2024 in Hubei province and has a capacity of 50 MW/100 MWh. [31][32]​.

Because they have no mechanical parts, battery storage power plants offer extremely short control times and start-up times of as little as 10 ms.[33]​ Therefore, they can help dampen rapid oscillations that occur when electric power grids operate near their maximum capacity or when grids experience anomalies. These instabilities (fluctuations with periods of up to 30 seconds) can produce peak oscillations of such amplitude that they can cause regional blackouts. Some of the parameters are voltage, frequency and phase. An energy storage plant with appropriately sized batteries can efficiently counteract these oscillations; Therefore, applications are mainly found in those regions where electrical power systems operate at full capacity, creating a risk of instability. However, some batteries have insufficient control systems and fail during moderate outages that they should have tolerated.[34] Batteries are also commonly used to reduce consumption for periods of up to a few hours.[35] A more recent use is transmission strengthening, as long power lines can operate closer to capacity when batteries handle the local difference between supply and demand. [36]​.

Storage plants can also be used in combination with an intermittent renewable energy source in stand-alone power systems. [37]​.

While the grid battery market is small compared to the other main form of grid storage, pumped hydropower, it is growing very fast. For example, in the United States, the energy storage plant market in 2015 increased by 243% compared to 2014.[85]​ The price of a 60 MW/240 MWh (4 hour) battery installation in the United States in 2021 was US$379/usable kWh, or US$292/nominal kWh, a 13% drop from 2020. [86]​ [87]​.

In 2010, the United States had 59 MW of battery storage capacity at 7 battery power plants. This figure increased to 49 plants having 351 MW of capacity in 2015. In 2018, the capacity was 869 MW in 125 plants, capable of storing a maximum of 1,236 MWh of generated electricity. At the end of 2020, battery storage capacity reached 1,756 MW. [88] [89] By the end of 2021, capacity increased to 4,588 MW.

As of May 2021, there were 1.3 GW of battery storage in operation in the UK, with 16 GW of projects in the pipeline that could be deployed in the coming years. [93]​ In 2022, UK capacity grew by 800 MWh, ending at 2.4 GW/2.6 GWh. [94]​ In June 2024 the capacity was 4.6 GW of power and 5.9 GWh of energy.[95]​.

Europe added 1.9 GW in 2022, with several more projects in planning.[96]​.

Following the blackout on April 28, 2025, which disconnected the Iberian grid from the rest of Europe in just five seconds and caused losses of up to €4.5 billion, the importance of resilience in the electricity system has become increasingly evident in Spain, with battery energy storage systems (BESS) emerging as a cornerstone of the country's energy transition.[97] Companies such as Iberdrola and Solaria are actively developing hybrid projects. of solar energy and batteries to counteract the effects of photovoltaic overproduction and the consequent fall in market prices, with Solaria alone starting eight new BESS installations in Castilla y León and Castilla-La Mancha.[98]​.

By the end of 2024, China had 62 GW/141 GWh of battery-powered power plants.[99]​ In 2020, China added 1,557 MW to its battery storage capacity, while storage facilities for PV projects account for 27% of capacity,[100]​ bringing the total energy storage capacity to 3,269 MW. electrochemistry.[101]​.

The Japanese energy sector has seen a significant expansion in its renewable energy capacity, growing more than 30% in the last five years and increasing demand for battery energy storage systems (BESS). More than half of the 2.4 gigawatts of capacity awarded in recent long-term low-carbon energy auctions was allocated to foreign companies or consortia. Major projects approved for 2024 include more than 1.37 GW of new BESS capacity and more than 6.7 GWh of energy capacity.[102]​ The Japanese auction of long-term decarbonizing energy sources incentivizes the deployment of BESS by guaranteeing the recovery of fixed costs for 20 years. However, low price volatility and a floor price in the electricity market could limit returns for BESS operators, underscoring the need for further reforms.[103][104]​.

Some developers are building storage systems from old electric car batteries, the costs of which can probably be halved compared to the original price.[105]​ A 53 MWh storage project, made up of refurbished electric vehicle batteries from Element Energy, has been operating since May 2024.[106]​.

Battery storage power plants and uninterruptible power supplies (UPS) are comparable in technology and function. However, power plants that store batteries are larger.

For safety reasons, batteries are located in their own structures, such as warehouses or containers. As in a UPS, one concern is that electrochemical energy is stored or emitted in the form of direct current (DC), while electrical power networks typically run on alternating current (AC). For this reason, additional inverters "Inverter (electronics)") are needed to connect battery storage plants to the high-voltage grid. This type of power electronics includes gate turn-off thyristors, commonly used in high voltage direct current = HVDC transmission.

Various accumulator systems can be used depending on the power-energy ratio, expected useful life and costs. In the 1980s, lead-acid batteries were used in the first power plants with battery storage. Over the following decades, nickel-cadmium and sodium-sulfur batteries were increasingly used. [10]​ Since 2010, more and more large-scale battery storage plants rely on lithium-ion batteries, as a result of the rapid decline in the cost of this technology, driven by the electric automotive industry. Mainly lithium-ion batteries are used. A vanadium redox battery with 4-hour flow at 175 MW/700 MWh was inaugurated in 2024. [11] Lead-acid batteries are still used in low-budget applications.

Contenido

La mayoría de los sistemas BESS están compuestos por paquetes de baterías sellados de forma segura, que se monitorean electrónicamente y se reemplazan una vez que su rendimiento cae por debajo de un umbral determinado. Las baterías sufren envejecimiento cíclico, o deterioro causado por los ciclos de carga y descarga. Este deterioro es generalmente mayor a tasas de carga elevadas y a mayor profundidad de descarga. Este envejecimiento provoca una pérdida de rendimiento (disminución de capacidad o voltaje), sobrecalentamiento y puede eventualmente provocar un fallo crítico (fugas de electrolito, incendio, explosión). A veces, las centrales eléctricas de almacenamiento de baterías se construyen con sistemas de almacenamiento de energía mediante volante de inercia para conservar la energía de la batería,

se utiliza el volante para suavizar el flujo de energía entre una fuente de potencia y su salida. Los volantes de inercia pueden manejar fluctuaciones rápidas mejor que las plantas de baterías más antiguas.

Las garantías BESS generalmente incluyen límites de por vida en el rendimiento energético, expresados como número de ciclos de carga y descarga. [12]​.

Lead-acid batteries

Lead acid batteries are first generation batteries and were generally used in older BESS systems. [13] An example is a battery of 1.6 MW peak and 1.0 MW continuous capacity that was put into service in 1997. Compared to modern rechargeable batteries, lead-acid batteries have a relatively low energy density. Despite this, they are capable of supplying high surge currents. However, unsealed lead-acid batteries produce hydrogen and oxygen from the aqueous electrolyte when overcharged. It is necessary to refill the water tank periodically to avoid damaging the battery and flammable gases must be evacuated to avoid risks of explosion. However, this maintenance has a cost, and recent batteries such as Li-ion do not have that problem.

Lithium-based batteries

Lithium-ion batteries are designed to have a long life without requiring maintenance. They generally have high energy density and low self-discharge.[15]​ Due to these properties, most modern BESSs are lithium-ion based batteries.[16]​.

A disadvantage of some types of lithium-ion batteries is fire safety, especially those containing cobalt.[17] The number of BESS incidents has remained around 10 to 20 per year (mainly during the first 2 to 3 years of age), despite the large increase in the number and size of BESS. Therefore the risk function has decreased. Failures occurred mostly in system checks and balances, while 11% occurred in cells.[18]​.

Examples of BESS fire accidents include individual modules at 23 battery parks in South Korea between 2017 and 2019, [19]​ a Tesla Megapack in Geelong, [20]​ [21]​ the fire and subsequent explosion of a battery module in Arizona, [22]​ and the Moss Landing LG battery fire and coolant short circuit incidents. [23]​ [24]​.

This has led to more research in recent years into mitigation measures for fire safety. [25]​.

In 2024, lithium-ferrophosphate (LFP) battery became another important type for large storages due to its high component availability, longer lifespan, and improved safety compared to nickel-based lithium-ion chemistries. of 2024, without any security incident. [27]​.

Sodium based batteries

Alternatively, sodium ion batteries are increasingly used in BESS. Compared to lithium-ion batteries, sodium-ion batteries have slightly lower cost, better safety features, and similar power delivery characteristics. However, it has a lower energy density compared to lithium-ion batteries.[28]​ Its operating principle and cell construction are similar to those of lithium-ion batteries (LIB), but lithium is replaced by sodium as the intercalating ion.[29]​ Some sodium-based batteries can also operate safely at high temperatures (sodium-sulfur battery). Some notable sodium battery producers are CATL, Faradion Limited, HiNa Battery Technology, Northvolt, Altris AB, and Tiamat.[30] Sodium-based batteries are not yet fully commercialized. The largest BESS using sodium ion technology began operations in 2024 in Hubei province and has a capacity of 50 MW/100 MWh. [31][32]​.

Because they have no mechanical parts, battery storage power plants offer extremely short control times and start-up times of as little as 10 ms.[33]​ Therefore, they can help dampen rapid oscillations that occur when electric power grids operate near their maximum capacity or when grids experience anomalies. These instabilities (fluctuations with periods of up to 30 seconds) can produce peak oscillations of such amplitude that they can cause regional blackouts. Some of the parameters are voltage, frequency and phase. An energy storage plant with appropriately sized batteries can efficiently counteract these oscillations; Therefore, applications are mainly found in those regions where electrical power systems operate at full capacity, creating a risk of instability. However, some batteries have insufficient control systems and fail during moderate outages that they should have tolerated.[34] Batteries are also commonly used to reduce consumption for periods of up to a few hours.[35] A more recent use is transmission strengthening, as long power lines can operate closer to capacity when batteries handle the local difference between supply and demand. [36]​.

Storage plants can also be used in combination with an intermittent renewable energy source in stand-alone power systems. [37]​.

While the grid battery market is small compared to the other main form of grid storage, pumped hydropower, it is growing very fast. For example, in the United States, the energy storage plant market in 2015 increased by 243% compared to 2014.[85]​ The price of a 60 MW/240 MWh (4 hour) battery installation in the United States in 2021 was US$379/usable kWh, or US$292/nominal kWh, a 13% drop from 2020. [86]​ [87]​.

In 2010, the United States had 59 MW of battery storage capacity at 7 battery power plants. This figure increased to 49 plants having 351 MW of capacity in 2015. In 2018, the capacity was 869 MW in 125 plants, capable of storing a maximum of 1,236 MWh of generated electricity. At the end of 2020, battery storage capacity reached 1,756 MW. [88] [89] By the end of 2021, capacity increased to 4,588 MW.

As of May 2021, there were 1.3 GW of battery storage in operation in the UK, with 16 GW of projects in the pipeline that could be deployed in the coming years. [93]​ In 2022, UK capacity grew by 800 MWh, ending at 2.4 GW/2.6 GWh. [94]​ In June 2024 the capacity was 4.6 GW of power and 5.9 GWh of energy.[95]​.

Europe added 1.9 GW in 2022, with several more projects in planning.[96]​.

Following the blackout on April 28, 2025, which disconnected the Iberian grid from the rest of Europe in just five seconds and caused losses of up to €4.5 billion, the importance of resilience in the electricity system has become increasingly evident in Spain, with battery energy storage systems (BESS) emerging as a cornerstone of the country's energy transition.[97] Companies such as Iberdrola and Solaria are actively developing hybrid projects. of solar energy and batteries to counteract the effects of photovoltaic overproduction and the consequent fall in market prices, with Solaria alone starting eight new BESS installations in Castilla y León and Castilla-La Mancha.[98]​.

By the end of 2024, China had 62 GW/141 GWh of battery-powered power plants.[99]​ In 2020, China added 1,557 MW to its battery storage capacity, while storage facilities for PV projects account for 27% of capacity,[100]​ bringing the total energy storage capacity to 3,269 MW. electrochemistry.[101]​.

The Japanese energy sector has seen a significant expansion in its renewable energy capacity, growing more than 30% in the last five years and increasing demand for battery energy storage systems (BESS). More than half of the 2.4 gigawatts of capacity awarded in recent long-term low-carbon energy auctions was allocated to foreign companies or consortia. Major projects approved for 2024 include more than 1.37 GW of new BESS capacity and more than 6.7 GWh of energy capacity.[102]​ The Japanese auction of long-term decarbonizing energy sources incentivizes the deployment of BESS by guaranteeing the recovery of fixed costs for 20 years. However, low price volatility and a floor price in the electricity market could limit returns for BESS operators, underscoring the need for further reforms.[103][104]​.

Some developers are building storage systems from old electric car batteries, the costs of which can probably be halved compared to the original price.[105]​ A 53 MWh storage project, made up of refurbished electric vehicle batteries from Element Energy, has been operating since May 2024.[106]​.