Case Study: Ameresco achieves solar-plus-storage renewable integration and peak-cost savings for electric cooperatives with Stem

Customizing Clean Energy Solutions for Electric Cooperatives

Ameresco, Inc., a cleantech integrator and renewable energy developer, needed a proven energy storage partner to design a customized solar-plus-storage solution for Holy Cross Energy and Colorado Mountain College. As a certified partner in Stem’s Partner Program, Ameresco selected Stem for its system design expertise and Athena® software to integrate and optimize the 5MW solar PV project paired with a 15MWh battery system.

Stem provided system design support and deployed its Athena platform to enable peak dispatch, monitoring, and optimization while Ameresco will build, operate, and maintain the facilities. The 5MW/15MWh system (plus 5MW PV) is expected to cut roughly 7,000 metric tons CO2e annually, help HCE meet its “100×30” goal, deliver direct bill savings to co‑op members, and supply renewable energy credits to Colorado Mountain College — demonstrating Stem’s measurable impact on cost, emissions, and renewable integration.

Ameresco

Louis Maltezos

Executive Vice President