MIAMI–(BUSINESS WIRE)–Spearmint Energy (“Spearmint” or the “Company”), a next-generation energy company bringing stable, secure and cost-effective energy solutions to the power grid with large-scale battery storage, has successfully closed an equity investment in Tierra Seca and Seven Flags, two 100 MW / 200 MWh Battery Energy Storage Systems (“BESS”) located in Del Rio and Laredo, respectively. The investment, which will support the addition of 400 MWh of energy storage capacity to ERCOT, wa