Primergy, Gridstor, Sunraycer and Plus Power progress large-scale US BESS projects

September 11, 2025
LinkedIn
Twitter
Reddit
Facebook
Email

A flurry of large-scale BESS project news from four major developer-operators across the US, coinciding with the country’s largest clean energy trade show RE+.

Plus Power’s completes New England’s largest BESS

Developer-operator has put New England’s largest battery energy storage system (BESS) into commercial operations.

The Cranberry Point Energy Storage project in Carver, Massachusetts, is a 150MW/300MWh system comprised of 82 Tesla Megapack 2XL units.

Cranberry Point was one of the first BESS facilities to secure a Capacity Supply Obligation with the Independent System Operator of New England (ISO-NE), in 2021, and it moves Massachusetts materially on its way to reaching its goal of 1,000MWh online by the end of this year.

This article requires Premium SubscriptionBasic (FREE) Subscription

Enjoy 12 months of exclusive analysis

Not ready to commit yet?
  • Regular insight and analysis of the industry’s biggest developments
  • In-depth interviews with the industry’s leading figures
  • Annual digital subscription to the PV Tech Power journal
  • Discounts on Solar Media’s portfolio of events, in-person and virtual

Or continue reading this article for free

Plus Power provided engineering, procurement, and construction on the project, on which Plus Power secured financing in July 2024. Last year also saw it finance an Arizona BESS and commission one in Hawaii, but the firm is active across the US.

Primergy gets approval for solar-plus-storage in Minnesota

Moving into the Midwest US, developer-operator Primegy has received unanimous state permit approval from Minnesota regulators for its Northern Crescent Solar + Storage project.

The project will pair up to 150MW of solar and 50MW of BESS capacity and is located in Faribault County.

Primergy will now find a suitable offtaker for the project’s power and set up the next steps for project delivery, targeting a connection to the grid in 2028 or sooner.

Minnesota is within the region of the Midcontinent Independent System Operator (MISO).

The company is known for the Gemini solar-plus-storage project in Nevada, one of the largest of its kind pairing 690MWac/966MWdc of solar PV with a 380MW/1,400MWh BESS. Read an ESN Premium interview with CEO Ty Daul about it here, from January.

Sunraycer Renewables and Engie land credit swap deal

Down in Texas, Sunraycer Renewables has reached a revenue swap agreement with international utility and power firm Engie for two solar-plus-storage projects.

A revenue swap is effectively a form of toll agreement, whereby an offtaker pays a project owner a fixed sum for the rights to the revenues of the project, taking on risk from the owner. Engie is the swap provider via its subsidiary Engie Energy Marketing North America (EEMNA).

The projects are the 50MW solar, 100MWh BESS Midpoint project in Blum, and the 75MW/150MWh Gaia project in Kerens. The revenue swap agreement will facilitate construction and operation of the two projects, for which Sunraycer announced financing in April this year.

Gridstor receives letter of credit from NORD/LB for pipeline

Lastly, GridStor has closed a US$50 million letter of credit with bank NORD/LB in support of its development pipeline.

It said the facility will support its projects which total 3GW of BESS capacity across the Western and Central US in later stage development or under construction.

The firm is backed by Goldman Sachs Asset Management and put its first project into commercial operation in California in late 2023. Since then, it has launched construction and acquired projects in Texas, and also acquired ones in Oklahoma and Arizona earlier this year.

CFO Frank Burkhartsmeyer discussed tax credits and transferability for storage with us for an ESN Premium article last year.

Read Next

October 22, 2025
It has become harder to finance BESS projects in the US, according to Ronak Maheshwari, a director at CRC-IB.
October 22, 2025
Recurrent Energy has closed a construction financing for an energy storage project in Arizona. Meanwhile, Cypress Creek Renewables has reached financial close for its solar-plus-storage project in Colorado.
Premium
October 22, 2025
John Zahurancik, Americas president at Fluence, discussed industry trends and policy directions with ESN Premium at this year’s RE+.
October 21, 2025
Ameresco has put Arizona’s largest behind-the-meter battery energy storage system (BESS) into operation, meanwhile Alliant Energy has begun operating Wisconsin’s largest BESS to-date.
October 21, 2025
Despite lowering its forecasts due to US-led tariff and policy disruptions, BNEF says 2025 will be a record-breaking year for energy storage.

Most Popular

Email Newsletter