NREL’s Sand-based 100-hour long-duration thermal energy storage technology moves to demonstration phase at 10 hours Four years ago, researchers at the National Renewable Energy Laboratory (NREL) won Department of Energy (DOE) ARPA-E funding to invent a new long-duration thermal energy storage technology able to discharge heat or power for 100 hours. The goal was to … Continue reading Long-duration thermal energy storage in sand begins NREL demo