Overview
- The Brunsbüttel installation is slated to begin operations by the end of 2026 at Covestro’s chemical site in northern Germany.
- Once operating, it is expected to supply about 10% of the site’s steam demand and reduce up to 13,000 metric tons of CO2 annually.
- The brick-based store heats ceramic blocks above 1,000°C, charges during surplus renewable power—typically 6–8 hours daily—and drives a conventional boiler to deliver emission-free steam.
- At 100 MWh, it will match Rondo’s California unit as the largest industrial heat battery, with financing support reported from Breakthrough Energy Catalyst and the European Investment Bank.
- The project extends a growing portfolio that includes a 100 MWh agreement with Heineken in Portugal and a 32 MWh system now serving a cement plant in Thailand.