ESS Tech has commissioned its iron‑flow battery system at the Turlock Irrigation District’s Project Nexus, a 1.6‑MW solar‑over‑canal array that feeds a 200‑MWh battery with a 10‑hour duration—equivalent to a 20‑MW power rating. This marks the first operational deployment of ESS’s Energy Base platform at a public‑utility solar project.
The commissioning confirms ESS’s claim of unlimited cycling and zero capacity degradation over a 25‑year design life, a key differentiator in the long‑duration storage market. The battery’s 200‑MWh capacity, combined with the 10‑hour duration, provides load‑shifting and grid‑stabilization services for the district’s irrigation operations.
Project Nexus integrates solar panels over irrigation canals, reducing water evaporation while generating renewable energy. The dual‑purpose design aligns with growing demand for water‑energy co‑generation solutions and positions ESS as a leader in sustainable, long‑duration storage.
CEO Drew Buckley said, “The successful commissioning of this project is an important milestone for ESS and a strong demonstration of our iron flow battery technology in a real‑world infrastructure application.” He added, “We are proud to support Turlock Irrigation District on this innovative project and believe it highlights the potential for long‑duration energy storage to play a valuable role in helping customers manage renewable energy, strengthen resilience and support broader resource conservation goals.”
The deployment validates ESS’s commercial readiness and expands its customer base beyond pilot projects. By demonstrating the Energy Base platform at a utility‑scale site, ESS can accelerate future sales, support its revenue‑recognition strategy, and enhance credibility with large‑scale buyers such as utilities and hyperscalers.
The milestone also underscores the importance of long‑duration energy storage for grid stability and renewable integration. ESS’s use of earth‑abundant materials—iron, salt, and water—offers a safe, non‑toxic alternative to lithium‑ion batteries, further strengthening its competitive position in the growing LDES market.
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