Energy storage systems (ESS) are helping Singapore store solar energy for later use, as the country works towards expanding its renewable energy sources.
Energy storage systems (ESS), essentially giant batteries, are crucial for storing excess solar energy generated during sunny days. This stored electricity can be used later, at night or during peak demand, providing backup during power outages. The Energy Market Authority (EMA) has awarded $7.8 million in grants to two companies to enhance ESS technology, such as installing systems underground and exploring new battery types.
Currently, Singapore uses lithium-ion ESS, with some systems storing energy to meet the needs of thousands of homes. One of the largest ESS installations is in Jurong Island, with a capacity of 285MWh, capable of powering around 24,000 four-room HDB households for a day. EMA and Sembcorp are working on expanding this system with higher capacity units.
VFlowTech, another company awarded grants, is using vanadium flow batteries, which are safer and less prone to fires compared to lithium-ion batteries. The company’s system on Pulau Ubin has reduced the island’s reliance on diesel by almost 100,000 litres annually. VFlowTech is also collaborating with Advario Asia Pacific and JTC Corporation to scale up its systems, using repurposed oil tanks for vanadium-ion liquid storage.
The next frontier is exploring the potential for underground ESS, which could save valuable land space. VFlowTech is conducting feasibility studies, focusing on fire safety and spill control, to ensure the safety of underground systems.
Additionally, Posh Electric is working on sodium-ion batteries, an alternative to lithium-ion batteries. Sodium is more abundant and potentially cheaper, though these batteries have a smaller storage capacity. Posh Electric is testing a 1MWh system in Singapore to evaluate its effectiveness in the tropical climate.
The development of ESS technologies is essential for Singapore’s goal of enhancing its renewable energy capabilities and reducing its reliance on fossil fuels.
