Using proven subsystems, a locally sourced supply chain, and abundantly available materials like salt, the system delivers economical, clean energy with a flexible power and heat delivery mix—available around the clock and without geological constraints. Malta's utility-scale, long-duration energy storage system uses steam-based heat pump technology to deliver dispatchable, cost-effective energy. Hear directly from the voices working alongside us to advance reliable. Malta's Pumped Heat Energy Storage (PHES) technology is based on a high-temperature heat-pump electricity storage system for large-scale long-duration energy storage (LDES). This technology is well-suited to the changing energy landscape, with the potential for discharge duration capabilities of. Malta is a long-duration energy storage company that builds grid-scale energy storage solutions to convert variable renewable energy into on-demand, around-the-clock, reliable power. is backed by blue-chip investors and strategic partners Malta Inc.