GreenRock Energy joins Long Duration Energy Storage Council

GreenRock Energy has joined the Long Duration Energy Storage Council as a start-up member, giving the Pittsburgh energy transition company a seat in a global group working to scale long duration storage across 20 countries. The move links GreenRock’s thermal storage platform and CHESS technology to policy, market research and industry collaboration around grid reliability and clean energy growth.

Why it matters: - GreenRock Energy gets access to a global network shaping policy, market design and deployment strategies for long duration energy storage. - The membership could widen visibility for CHESS, GreenRock's thermal storage platform that aims to support grid reliability, industrial decarbonization and renewable integration. - Long duration storage matters because utilities and developers need technologies that can shift energy for many hours, not just short periods.

What happened: - GreenRock Energy joined the Long Duration Energy Storage Council as a start-up member. - The announcement was made Aug. 5, 2026, from Pittsburgh. - The LDES Council connects organizations across 20 countries focused on accelerating long duration energy storage deployment. - GreenRock joined the same cohort as AirTrunk, which joined as an anchor member, and Sinergy Flow, a redox flow battery developer.

The details: - GreenRock describes its platform as technology-agnostic and built for industrial decarbonization, grid-scale storage, renewable infrastructure development and long-term energy resilience. - CHESS is GreenRock's thermal storage technology. - CHESS can discharge stored energy as electricity or industrial process heat. - The technology supports storage durations from 8 to more than 100 hours. - GreenRock applies the platform to solar and storage integration, grid firming, industrial decarbonization and waste heat recovery. - Membership in the council gives GreenRock access to policy advocacy, market research and cross-industry collaboration. - GreenRock said the membership extends its role in the conversation around thermal storage and grid reliability. - Matthew James, GreenRock co-founder and president, said the council will let the company work with leading organizations on scalable storage solutions that strengthen grid reliability and support clean energy growth. - The LDES Council said the new members strengthen the diverse ecosystem needed to accelerate deployment. - Julia Souder, the council's CEO, said rising electricity demand and more complex energy systems make collaboration across the value chain increasingly important. - Souder said the council looks forward to working with the new members to advance technologies, partnerships and market frameworks for global scale-up. - GreenRock also says it develops, acquires and operates renewable energy assets, including solar, waste heat recovery and long duration thermal energy storage. - The company says it has exclusive access to CHESS, which it describes as a solid-mass thermal storage technology designed for scalable, reliable and dispatchable energy on demand.

Between the lines: - The partnership places GreenRock in a policy and market forum that could help thermal storage compete for a bigger role in grid planning. - The council's emphasis on multiple technology types suggests long duration storage is becoming a broader category, not a single-solution market. - GreenRock's focus on industrial heat as well as electricity positions the company to serve sectors that batteries do not easily address.

What's next: - GreenRock is likely to use the council relationship to expand visibility with policymakers, utilities and industrial customers. - The LDES Council will continue working with members to shape the frameworks needed for wider deployment of long duration storage. - More collaboration among energy, data center and storage companies could follow as electricity demand rises and grid flexibility becomes more valuable.

The bottom line: - GreenRock's council membership connects a thermal storage developer to a global effort to make long duration energy storage a bigger part of the clean energy system. - More information: GreenRock Energy - More information: Long Duration Energy Storage Council