en.Wedoany.com Reported - U.S. renewable energy company Spearmint Energy has achieved commercial operation of two standalone battery energy storage systems (BESS) in Texas, adding a combined 200 MW/400 MWh of capacity to the ERCOT power market.

The two projects, named Tierra Seca and Seven Flags, each configured with 100 MW/200 MWh of batteries, are located in Del Rio and Laredo. Spearmint Energy confirmed that both projects began operations in late December 2025 and are approaching six months of successful operation.

Mortenson was responsible for the engineering, procurement, and construction (EPC) of the projects, with both sites utilizing Sungrow's PowerTitan 2.0 energy storage platform.

Spearmint Founder, President, and CEO Andrew Waranch stated that this milestone was achieved with the support of Mortenson. Waranch said, "We are thrilled that Tierra Seca and Seven Flags have achieved commercial operation. Amidst continued rapid growth in electricity demand, this milestone represents a critical step in expanding reliable, secure, and cost-effective energy supply within ERCOT. We appreciate our partnership with construction partner Mortenson, whose team worked closely with us during development and construction to bring this storage capacity online for the region."

Kevin Boyce, Vice President and General Manager of Mortenson's Energy Storage business, said, "Mortenson is honored to partner with Spearmint Energy and witness Tierra Seca and Seven Flags achieve commercial operation. These projects add flexible capacity, support ERCOT reliability, and demonstrate how strong collaboration can safely and on-time bring complex energy infrastructure into operation."

Spearmint Energy currently operates 350 MW/700 MWh of capacity within ERCOT and has over 20 projects under development across five regions and 13 states in the U.S., totaling more than 15 GWh of capacity. Spearmint Energy previously secured equity investment for the Tierra Seca and Seven Flags projects from Kyuden International Corporation, in addition to obtaining over $250 million in construction financing in the second quarter of 2025 from Manulife, East West Bank, Investec, and Sugar Creek Capital.

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