Ameresco signs deal with Snohomish County Public Utility District for energy storage system

Ameresco, Inc. has inked a deal with Snohomish County Public Utility District to construct a battery energy storage system (BESS).

The storage system features a 20-year guaranteed capacity of 25 megawatts (MW) and 100 megawatt-hours (MWh).

This would be the largest standalone battery project to date in the Pacific Northwest. The 25-year tolling agreement keeps Ameresco as the asset owner and Snohomish PUD as the exclusive customer of the project.

The BESS will provide the district with enhanced electrical system reliability and flexibility while reducing exposure to energy price volatility.

“This project represents a paradigm shift in the Pacific Northwest energy industry,” Nicole Bulgarino, executive vice president at Ameresco, said. “By collaborating with Snohomish PUD, we are pioneering a unique model where the owner and the customer are distinct entities, showcasing the versatility and scalability of utility-scale storage solutions.”

Ameresco is a leading cleantech integrator and renewable energy asset developer, owner and operator. Construction is expected to begin in late 2024 and the facility will be operational in late 2025. The long-term arrangement underscores both organizations’ commitments to driving innovation and sustainability within the region.

“We’re excited to work with Ameresco on making this new battery energy storage project a reality,” John Haarlow, Snohomish PUD CEO/general manager, said. “Energy storage is a critical component to helping us keep the grid reliable and affordable while also meeting our clean energy goals.”

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