In this US news roundup, battery energy storage system (BESS) project updates from Spearmint Energy in Texas, Polaris Renewable Energy in Puerto Rico, and Clearway Energy Group in Utah.
Battery storage developer and operator Spearmint Energy has achieved commercial operation on two battery energy storage systems (BESS) in Texas.
Announced 12 May, the 100MW/200MWh Tierra Seca and 100MW/200MWh Seven Flags BESS projects, located in Del Rio and Laredo, respectively, began operation in late December 2025, and have completed nearly six months of operations.
Construction of the projects was led by engineering, procurement, and construction (EPC) firm Mortenson. They both use PV inverter and BESS company Sungrow’s PowerTitan 2.0 energy storage platform.
PowerTitan 2.0 integrates a 5MWh battery with a 2.5MW power conversion system (PCS) into a standard 20-foot container. In June 2025, the company launched its PowerTitan 3.0 system, and claimed the 30-foot product as the world’s largest BESS in terms of capacity and energy density.
