Antora Energy has commissioned a 50 MW / 5 GWh thermal energy storage system at biofuels producer POET’s Big Stone City bioprocessing facility in South Dakota. Backed by project-level financing from Grok Ventures, the installation is designed to deliver round-the-clock energy under a long-term heat offtake agreement and ranks among the world’s largest thermal energy storage projects.
Antora Energy has commissioned its 5 GWh thermal energy storage system at US biofuels giant POET’s Big Stone City bioprocessing facility in South Dakota, US.
The 50 MW / 5 GWh facility some 180 miles / 300 kilometers west of Minneapolis, Minnesota, was constructed in around a year, and serves as one of the largest energy storage installations globally.
Australian private investment and venture capital firm founded by Atlassian co-founder Mike Cannon-Brookes, Grok Ventures provided project-level financing as the sole external investor the thermal energy storage system (TES). Grok’s investment enabled the project to reach financial close and be commissioned.
The system will provide POET with 50 MW of competively priced, around-the-clock energy under a long term heat offtake agreement, enabling the plant to increase its bioethanol production.
The project is designed to charge rapidly during periods of excess local electricity generation, helping optimize the use of existing grid infrastructure. The deployment demonstrates how integrated thermal energy storage systems can support industrial operations with reliable, cost-effective clean energy while improving grid efficiency.
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