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Stem completes solar and storage project for Arizona utility

The Sulphur Springs project is one of three similarly sized projects that Stem and Prometheus are building for AEPCO's utilities in Arizona, all of which are expected to be online by year's end.

Stem is using its Athena energy management system (EMS) software platform to operate and monitor the project. A photo included in the announcement (above) shows that the BESS units used for the project were Stack750e, which are part of system integrator Powin's Centipede grid-wide BESS platform.

Stem Inc. operates in the cooperative utility segment, which, according to the company's CEO, John Carrington, represents a significant share of the grid-scale energy storage market in the United States.

“More than 900 electric cooperatives in 48 states make up the largest electric grid in the United States. This segment is forecast to be one of the fastest growing segments of the front-of-the-meter (FTM) market by the end of this decade and is expected to account for over 20% of all future storage deployments,” Carrington said.

Stem Inc. announced in May that the company expects to be EBITDA positive in 2024, despite a decline in revenue and orders in the first quarter of the year that was also seen at other U.S.-focused systems integrators.

Arizona, meanwhile, continues to grow as one of the most important energy storage markets in the U.S., and is among the most active after leading markets California and Texas. In recent months, Leeward signed a cross-border PPA for a 450 MWh BESS, Plus Power secured $82 million in tax equity for a BESS project, while SRP and NextEra brought the largest in the state online.

Anna Harden

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