ESS Completes Grid Connection of First Energy Center Project 

March 27, 2025

By Kelly Goodman, Interim CEO

This week, ESS’ Energy Center™ product line surpassed another major milestone with the commissioning of the first Energy Center™ project following the previously announced construction and initial testing. 

Initial testing included verification of the controls interface, operational readiness, and performance. Commissioning, completed this week, means that the Energy Center units are fully connected to the grid, providing valuable long-duration energy storage (LDES) and ancillary services. The commissioning process verified integration with utility control systems and ability to remotely monitor and control the Energy Center systems through various operational modes.   

The ESS Energy Center™ product represents a significant advancement in ESS’ safe and sustainable iron flow technology. Advancements include a 20% increase in electrolyte energy density, improved energy storage capacity and reduced auxiliary energy requirements. Taken together, these improvements reduce costs and increase value for ESS’ customers in comparison to earlier generation ESS products.    

The length and complexity of commissioning for new energy infrastructure projects depends on many factors. At ESS, we have designed the Energy Center for rapid, turnkey deployment at customer sites worldwide. Our products meet or exceed key industry standards for safety and interoperability, enabling expeditious permitting and interconnection.  

This is critical for ESS customers, as rapidly growing electricity demand from AI data centers and broader trends towards electrification place new stresses on the grid which LDES addresses. 

With commissioning complete, we look forward to demonstrating the unique capabilities of ESS’ iron flow technology as the first grid-connected Energy Center™ project delivers long-duration energy storage and ancillary services to support a cleaner, more resilient grid.   

Looking ahead, installation of our larger Energy Center deployment in Florida will begin in Q2 of this year and we look forward to delivering our first large-scale Energy Base projects in 2026.  

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