September 30, 2021: ESS Tech, the iron flow battery manufacturer, announced today that it had entered into a framework agreement with SB Energy, a wholly owned subsidiary of SoftBank Group, to deploy 2GWh of ESS batteries through 2026.
The first ESS system has already been delivered to an SB Energy location in Davis, California, and will be commissioned in the month ahead. SB Energy plans to install additional ESS flow battery systems to complement its expanding portfolio of solar power projects in Texas and California, two of the fastest-growing markets for long-duration storage in the US.
The announcement of this framework agreement will enhance the attractiveness of ESS ahead of its Nasdaq listing as a public company through a merger with a special purpose acquisition company, ACON S2 Acquisition Corp. SB Energy is already a major investor in ESS.
ESS’s iron flow batteries are manufactured using commonly available ingredients of iron, salt, and water.
Separately, on September 23 ESS announced that it had closed an order with Enel Green Power España to deliver 17 ESS Energy Warehouse iron flow battery systems. The ESS systems will have a combined capacity of 8.5MWh.
The long-duration batteries will be used to support a solar farm in Spain as a part of a broader EU-wide engagement, providing resilience for the local power grid.
Pasquale Salza, head of long-duration storage and hybrid systems for Enel Green Power, said the project aimed to “assess and validate the ESS flow batteries, which we selected due to their combination of long-duration capacity, long-life performance, environmental sustainability and safe operation”.
Eric Dresselhuys, CEO of ESS, said the firm’s systems had already passed a six-month technology and company readiness assessment, “meeting Enel’s stringent performance, durability and cost requirements to become an officially qualified global vendor”.
“Another key factor in Enel’s decision is that our batteries are covered by a comprehensive insurance plan underwritten by Munich Re, the world’s largest reinsurance company,” he said.
ESS says it is working with several key partners on this project, including Loccioni, a global systems integrator with projects in more than 45 countries, and Enertis, an international consulting and engineering firm headquartered in Spain.