Stem and Arizona Electric Power Cooperative (AEPCO) in partnership with Prometheus Power (Prometheus) announced the successful deployment of a co-located storage and solar project to help deliver clean, reliable power to its distribution co-ops and public power members. The project for Sulphur Springs Valley Electric Co-op (SSVEC), an AEPCO member co-op, includes a 40-megawatt hour (MWh) energy storage system and an existing 20-megawatt (MW) photovoltaic (PV) system that will integrate Athena®?, Stem's award-winning AI-driven clean energy software, to continuously operate and monitor the storage system for maximized performance on a single, unified platform. The SSVEC project is the first of three similar sized deployments that Stem will collaborate on with Prometheus to provide Stem's services for AEPCO's other managing co-ops.

All three projects are expected to come online by the end of the year. These follow Stem's recent co-op project wins, including a 23 MW solar plus 60 MWh storage project for Mohave Electric Cooperative (MEC), an AEPCO distribution co-op, and a 313 MWh standalone energy storage project with Prometheus for a major co-op customer. Stem has booked more than $1 billion of contracts associated with the growing municipal and co-op utility market segment.

Most immediately, AEPCO will be hosting a ribbon cutting ceremony in Sahuarita, Arizona on June 13, 2024.