Malta is a privately held company that was spun out from X (Alphabet’s “Moonshot Factory,” formerly known as Google X) in 2018 and offers a long-duration pumped heat energy storage (PHES) system, providing synchronous energy storage capacity from 8 hours to 8 days or longer. Malta’s PHES system consists of commercially-available and proven technologies and equipment, with the innovation coming from the integration of these components to offer a immediately scalable, low-risk, and flexibly sitable LDES solution.