Brad Kell, UniEnergy Technologies vice president of Deployment and Field Service, explains how a flow-battery system works to two guests before a dedication ceremony for Snohomish Public Utility District’s second energy storage system Tuesday in Mukilteo. The system is the largest containerized vanadium flow battery in the world by capacity. The project is part of the PUD’s efforts to shape the energy storage market. This system was paid for in part with money from the Washington State Clean Energy Fund. (Andy Bronson / The Herald)

Mukilteo firm’s huge batteries at forefront of clean energy

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