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Sodium-Sulfur (NaS) Batteries: High-Temperature Contenders Sodium-sulfur batteries are high-temperature batteries that deliver large amounts of energy for longer durations. Utilities have used them for grid support and load leveling. Pros: Cons: Best for utility-scale BESS applications where space and temperature control are manageable.
Sodium also has high natural abundance and a respectable electrochemical reduction potential (−2.71 V vs. standard hydrogen electrode). Combining these two abundant elements as raw materials in an energy storage context leads to the sodium–sulfur battery (NaS).
Sodium–sulfur batteries offer long battery lifetime (up to 15 years) and a claimed response time of 1 ms, which turn them into an attractive candidate for short-term grid-supportive services (Vassallo, 2015; Breeze, 2018).
However, sodium–sulfur batteries have to be kept at high temperatures above 300 °C to keep the reactants liquid, which entails additional effort for heating and thermal insulation, while relatively low round-trip efficiency and further safety concerns over its explosiveness have constrained its wide-scale implementation.
The Delhi government is building India's first large-scale battery energy storage system (BESS) at the BSES power grid in Kilokri, South Delhi. This system will store electricity in batteries and supply power during peak hours or emergencies. With a 20 MW/40 MWh capacity, it will provide four hours of daily power to about one lakh residents.
The system is also India's "first commercially approved" utility-scale energy storage system that will ensure improved power supply in different south Delhi areas, covering a population of over one lakh people, according to a statement from power discom BRPL (BSES Rajdhani Power Limited).
Situated in South Delhi's Kilokri, the battery system will operate with a capacity of 20 MW/40 MWh. The minister visited the site on Wednesday, and “This is like a huge inverter. It stores electricity and can be used during emergencies or power cuts”.
AmpereHour Energy, a full-stack energy storage solutions provider, in consortium with Indigrid, has commissioned BSES Rajdhani Power Ltd's (BRPL) 20 MW/40 MWh battery energy storage system (BESS) project at the BSES Rajdhani Kilokari Substation in Delhi.
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