GridStor, a developer and operator of utility-scale battery energy storage projects, announced the acquisition of the 100 MW/400 MWh White Tank battery storage project in Arizona from Strata Clean Energy, a vertically integrated solar and storage project developer.
The project is located in Maricopa County and is expected to reach commercial operation in the first half of 2027. It will be operated via a 20-year tolling agreement with Arizona Public Service, the state’s electric utility.
Strata Clean Energy will continue to serve in a consultative role for the project until it reaches commercial operations.
This deal marks GridStor’s fourth acquisition within the last twelve months and its second in Arizona. The company expects to continue acquisitions of advanced-stage projects in regions with rapidly growing energy demand.
The company, backed by Goldman Sachs Asset Management, has a project pipeline of over 5 GW of battery storage projects in later-stage development or under construction across the western and central U.S.
“Strata is proud to play a foundational role in advancing Arizona’s clean energy infrastructure,” said Markus Wilhelm, Chief Executive Officer of Strata Clean Energy. “The White Tank project reflects our commitment to delivering grid-scale solutions that support utility partners like APS in meeting rising demand with reliability and resilience.”
In February, GridStor announced the acquisition of a 150 MW/300 MWh battery energy storage project in Texas from Balanced Rock Power, a U.S.-based developer of solar and energy storage projects. The project in Hidalgo County, Texas, is expected to reach commercial operation by the summer of 2026.
According to Mercom’s 1H and Q2 2025 Funding and M&A Report for Energy Storage report, announced Energy Storage project financing increased 168% year-over-year in 2025.
In August, Zenobē, a U.K.-based owner and operator of grid-scale battery storage, announced the acquisition of a 400 MW ready-to-build battery energy storage system in Low Harker, Cumbria, from Innova, a U.K.-based renewable energy project developer.
