- Albion, City of (no website)
- Alder Mutual (no website)
- Ashland, City of
- Asotin County PUD #1
- Bandon, City of
- Benton REA
- Big Bend Elec Coop
- Blaine, City of
- Bonners Ferry, City of
- Blachly Lane Elec Coop
- Burley, City of
- Canby, City of
- Cascade Locks, City of
- Central Electric Cooperative
- Central Lincoln PUD
- Centralia, City of
- Cheney, City of
- Chewelah, City of
- Clallam County PUD #1,
- Clearwater Power
- Columbia Basin Electric Coop
- Columbia Power Coop (no website)
- Columbia REA
- Columbia River PUD
- Consolidated District #19
- Consumers Power
- Coos Curry Elec Coop
- Coulee Dam, City of
- Declo, City of (no website)
- Douglas Electric Cooperative
- Drain, City of
- East End Mutual Electric (no website)
- Eatonville, Town of
- Ellensburg, City of
- Elmhurst Mutual P & L
- Energy Northwest
- Fall River Elec Coop
- Farmers Elec Coop
- Ferry County PUD #1
- Flathead Elec Coop
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- Forest Grove, City of
- Glacier Elec Coop
- Grant County PUD #2
- Harney Elec Coop
- Hermiston, City of
- Heyburn, City of
- Hood River Elec Coop
- Idaho County L & P
- Inland P & L
- Jefferson County PUD #1
- Kittitas County PUD #1
- Kootenai Electric Coop
- Lakeview L & P
- Lane County Elec Coop
- Lincoln Electric Coop (MT)
- Lost River Electric Coop (no website)
- Lower Valley Energy
- Mason County PUD #1
- Mason County PUD #3
- McCleary, City of
- McMinnville, City of
- Midstate Elec Coop
- Milton, City of (no website)
- Milton-Freewater, City of
- Minidoka, City of
- Mission Valley
- Missoula Elec Coop
- Modern Elec Coop
- Monmouth, City of
- Nespelem Valley Elec Coop
- Northern Lights Coop
- Northern Wasco County PUD
- Ohop Mutual Light Company
- Okanogan County Elec Coop
- Orcas P & L
- Oregon trail Coop
- Parkland L & W
- Peninsula Light Company
- Plummer, City of
- Port Angeles, City of
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- Port of Seattle - SEATAC Int'l Airport
- Raft River Elec Coop
- Ravalli County Elec Coop
- Richland, City of
- Riverside Elec Coop (no website)
- Rupert, City of
- Salem Electric Coop
- Salmon River Elec Coop
- Skamania PUD #1
- Soda Springs, City of
- Southside Elec Lines (no website)
- Springfield Utility Board
- Steilacoom, Town of
- Sumas, City of
- Surprise Valley Elec Coop
- Tanner Elec Coop
- Tillamook PUD #1
- Troy, City of
- U.S. Airforce Base, Fairfield
- U.S. DOE Albany Research Center
- U.S. DOE Richland Operations Office
- U.S. Naval Base, Kitsap (Bremerton; Bangor)
- U.S. Naval Station, Everett (no website)
- U.S. Naval Submarine Base, Bangor (no website)
- Umatilla Elec Coop
- Umpqua Indian Utility Coop
- United Elec Coop
- USBIA Wapato
- Vera Water and Power
- Vigilante Elec Coop
- Wahkiakum County PUD #1
- Wasco Elec Coop
- Weiser, City of
- Wells Rural Elec Coop
- West Oregon Electric Coop
- WhatcomCounty PUD #1
- Yakama Power
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