NWPPA Bulletin, Feb. 2017, by Neil Neroutsos. -- scroll to page 26 of the .pdf.
https://www.nwppa.org/wp-content/uploads/Bulletin_Feb_2017_WEB.pdf

"Later this winter, Snohomish County Public Utility District will bring online its second energy storage system at a substation in Everett, Wash. The battery storage systems aim to transform the marketplace and how utilities manage grid operations. They also are designed to improve reliability and the integration of renewable energy sources, which are rapidly growing in the Pacific Northwest. The projects were made possible in part by a $7.3 million investment from the Washington State Clean Energy Fund."