Long-duration iron flow battery manufacturer ESS Inc announced a new contract with Chilean utility, Edelaysen, a GRUPO SAESA company, to provide a flow battery system to support a renewable energy-based microgrid in Chile.

Edelaysen will deploy ESS Inc.’s 300-kW/2-MWh Energy Warehouse, integrated with renewable resources in a microgrid system in the environmentally pristine Patagonia area of Chile. The company said the microgrid will displace three-fourths of diesel generator use in the region.

Edelaysen is expected to save approximately $3 million in diesel fuel and maintenance over the system’s 25-year life. In addition, the equivalent of 12 years of diesel emissions (8.8 GWh) will be avoided.

“ESS Inc.’s long-duration iron flow battery will greatly reduce the need to run generators to meet demand,” said Marcelo Bobadilla of SAESA. “We also highly value that the system is safe, earth-friendly, and will operate at full capacity for at least 20 years without replacement – these were critical decision factors.”

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Edelaysen’s grid is served by run-of-river hydropower that varies daily and seasonally, which means the company operates supplemental diesel generators throughout to meet customer demand when it exceeds hydro output. With Chile implementing cleaner forms of generation and aiming to reduce CO2 emissions across the country, a sustainable alternative to continuous diesel dependence in their operating area was essential.

“Our analysis showed that if they used lithium-ion batteries, Edelaysen could only shut down their diesel gensets for about three months per year,” said Eric Dresselhuys, ESS CEO. “Instead, our long-duration iron flow storage system will reduce the need to run them by three times as much – the equivalent of nine months a year. That’s

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