Aug. 5, 2026 — Ørsted has announced that Old 300 Storage, a 250 MW/500 MWh battery energy storage system in Needville, Texas, has reached commercial operations and is now fully integrated into the ERCOT grid.
The project marks Ørsted’s 12th project in Texas and expands the company’s battery energy storage presence in the United States. It also adds to Ørsted’s 6 GW portfolio of operating U.S. onshore energy projects.
Melissa Peterson, president of Ørsted Americas Onshore, said battery energy storage has played an important role in providing power to ERCOT during periods of tight supply and demand. She said Old 300 Storage would strengthen grid reliability by giving Texas grid operators additional resources and supporting more diverse and localized energy options as electricity demand grows.
Old 300 Storage is co-located with the 430 MW Old 300 Solar project but operates independently. The storage system is designed to help improve grid stability by supplying power when it is needed most. Old 300 Solar has supplied electricity to about 80,000 homes and businesses in Texas since 2024 and was among the largest solar projects to come online in the United States that year.
Together, the solar and storage projects are expected to generate approximately $110 million in property tax revenue to support local infrastructure, schools and emergency services.
Ørsted procured the battery energy storage system from Tesla. The Megapacks used at the project were manufactured at Tesla’s Megafactory in Lathrop, California, the largest industrial energy storage manufacturing facility in the United States. Ørsted and Tesla also worked with the Needville Fire Department to provide education on product technology and safety response protocols.
Ørsted said the project demonstrates how energy storage and solar can work together to help meet rising electricity demand and support a stable, reliable grid. The company’s Americas Onshore business includes more than 6 GW of wind, solar and battery storage capacity in operation across eight states.
