The U.S. Department of Energy (DOE) has finalized a $489.4 million loan to Amanecer Puerto Rico LLC, a subsidiary of Pattern Energy, to support battery energy storage projects aimed at improving grid reliability and lowering electricity costs across Puerto Rico. The financing will fund the deployment of 220 MW of battery energy storage systems (BESS) in Arecibo and Santa Isabel. DOE said the financing package was restructured following a federal review to align with current priorities related to grid reliability, energy affordability and domestic manufacturing. In addition to supporting energy storage, DOE said the financing establishes a framework for potential future development of dispatchable natural gas-fired generation to enhance grid stability and improve the island's long-term energy security. DOE said the financing is intended to accelerate private-sector investment in projects that strengthen grid reliability, modernize energy infrastructure and improve system resilience.