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If it seems like energy storage is popping up more often as a power alternative, you’re not wrong. The U.S. Energy Storage Monitor report released last week by the American Clean Power Association (ACP) and Wood Mackenzie found that the 5.3 gigawatts (GW) installed in Q3 2025 (4.6 GW at utility scale) pushed the year-to-date total past the entire year’s installations in 2024.
“The residential storage market continued to expand for the sixth consecutive quarter, installing 647 megawatts (MW) in Q3, a 70% year-over-year increase,” ACP stated in a release. “California, Arizona, and Illinois led deployments as attachment rates reached new highs. Wood Mackenzie projects Q4 2025 will set a record for the residential sector as customers accelerate installations ahead of the federal Section 25D investment tax credit expiration as part of the One Big Beautiful Bill Act.” The Community, Commercial and Industrial (CCI) segment installed 33 MW in Q3, down 8% year-over-year. “California captured 54% of installations with 17.8 MW, while Illinois emerged as a key growth market alongside Massachusetts, driven by state rebate programs and community storage projects.”
“We’re seeing states step up with innovative programs, grids increasingly reliant on storage for reliability and costs at record lows,” said Allison Weis, global head of storage at Wood Mackenzie. “The industry’s ability to navigate these challenges and maintain a 15% increase in our five-year utility forecast since the passage of the OBBA demonstrates that storage has evolved from an emerging technology to an essential grid resource.”
Battery storage requires batteries of course. Its supply chain also extends to the manufacture of battery separators, which requires substantial plant investment. Site Selection recently has chronicled the location decisions of several battery separator plants: Microporous in Virginia, Asahi Kasei in Port Colborne, Ontario, and Entek in Indiana. Natrion makes them at its plant in Binghamton, New York. Despite concern over whether a U.S. Department of Energy grant would come through, officials say the Microporous project is moving forward at the Southern Virginia Megasite at Berry Hill, according to a report last month by Cardinal News. Meanwhile, Entek, which received its own federal loan in 2024, in September benefited from an $800 million acquisition of a majority equity interest in the company by Miami-based I Squared Capital that will help propel completion of the country’s first gigafactory for lithium-ion separators. — Adam Bruns
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