Storworks FlexJoule stores energy in modular concrete blocks, delivering dispatchable steam or power at a fraction of lithium-ion’s cost.
More About the Technology
Storworks developed FlexJoule, a thermal energy storage system that stores heat in modular, high-temperature concrete blocks. FlexJoule unlocks untapped capacity within existing interconnections or process heat systems, delivering steam, electricity, or both on demand, and charging from steam or electricity when it’s not needed.
Manufactured using unconstrained supply chains with no critical minerals, cycling degradation, or thermal runaway risk, FlexJoule delivers speed-to-capacity at a fraction of the cost of lithium-ion storage.
Learn More About GridReady
GridReady, a first-of-its-kind partnership with Great River Energy, Minnesota Power, Xcel Energy, and Otter Tail Power to connect the nation's most promising energy startups with real-world utility pilot opportunities, with a focus on grid modernization and grid-enhancing technologies (GETs), electrification, and energy storage.
Utility Innovation Study
The GridReady program was developed as an outcome of our 2025 Utility Innovation Study completed with the University of Minnesota and funded by the IN2 Initiative (partnership between Wells Fargo and the National Lab of the Rockies). It explores the challenges and opportunities for startups and utilities to collaborate and bring more cutting-edge technologies to the energy transition.