All prospective variable renewable energy (VRE) plants with at least 10 megawatts (MW) capacity must now integrate an energy storage system (ESS) under new rules from the Department of Energy (DOE).

The requirement follows Department Circular No. DC2026-02-0008, which updates the ESS policy framework.

“The updated framework advances the government’s commitment to a just energy transition by supporting ESS deployment and ensuring its systematic integration in both grid-connected and off-grid areas, enabling higher renewable energy penetration while preserving power quality and system reliability,” the DOE said in a news release Thursday.

The DOE added that ESS installations are encouraged “to include grid-support capabilities, including but not limited to grid-forming (GFM) inverters that help stabilize voltage and frequency.”

These capabilities, it said, “are intended to mitigate the inherent variability of renewable output, enable optimized dispatch, minimize generation losses, and strengthen the grid’s ability to maintain power quality, reliability, and overall system stability.”

“Energy storage is not only about storing surplus energy, it is about strengthening the grid’s capability to absorb more renewable while maintaining reliability,” Energy Secretary Sharon Garin said.

“This policy ensures that ESS integration becomes part of system planning and project development, supporting better outcomes for consumers,” she added. (PNA)