Snohomish PUD prepares to open first battery storage site in Arlington

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Washington’s first battery energy storage facility is set to open this fall in Arlington.

The facility will store up to 25 megawatts of energy when it is abundant and discharge it to the grid during peak times each month to help reduce costs, said Snohomish County Public Utility District spokesperson Erica Keene in an email. PUD purchases the majority of Snohomish County’s energy from the Bonneville Power Administration, a federal agency that primarily produces hydroelectric power.

“The PUD’s peak hour each month drives a significant part of the energy bill we pay,” Keene said. “Discharging a battery against these peaks can reduce our demand charges on a monthly basis.”

The facility won’t be fully energized until the fall, but 29 large Tesla batteries are already visible on PUD’s clean energy campus in Arlington. The facility is quite small — covering 1.4 acres — compared to other battery energy storage facilities in the works in Washington.

https://www.heraldnet.com/2026/07/10/snohomish-pud-prepares-to-open-first-battery-storage-site-in-arlington/

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1. Everybody needs to have these. Free energy (other than the hardware and/or infrastructure to store the energy

and/or route) is always good and saves wear and tear on our planet, burns no fossil energy that contributes to pollution, etc. I'll have to check if we have such a storage thing in MO. Ameren in MO has a huge solar farm in northern MO, and I am wondering how they store/distribute the power.