| Alamon, Inc. | Kalispell, MT | V |
| Basin Tree Service & Pest Control, Inc. | Ephrata, WA | T, U |
| Batchelor Excavation, LLC | Manson, WA | Cc, Fa, U |
| Burke Electric LLC | Bellevue, WA | Ab, Ac, Ca, Cd, Fa |
| Cascade Cable Constructors, Inc. | Spokane, WA | Ab, Ac, Ea, Eb, Fa |
| Davey Tree Surgery Company | Livermore, CA | T, U, V |
| Electrical Utility Services LLC | Davenport, WA | Aa, Ab, Ac, Ca, Cb, Cc, Cf, Da, Ea, Eb, Fa |
| Henkels & McCoy | Portland, OR | Aa, Ab, Ba, Bb, Bc, Ca, Cb, Cc, Cd, Ce, Ea, Eb, Fa |
| Hurst Construction LLC | Wenatchee, WA | Cc, Ce, Fa, U |
| Intec Services, Inc. | Fort Collins, CO | V |
| KP2 LLC,Dba Pennington Construction | Wenatchee , WA | Cc, Ce, Fa |
| Magnum Power, LLC | Castle Rock, WA | Aa, Ab, Ac, Ba, Bb, Bc, Ca, Cb, Cc, Cd, Ce, Cf, Cg, Da, Ea, Eb, Fa, U, V |
| MI-TECH SERVICES, INC. | Fond du Lac, WI | V |
| Michels Corporation | Neenah, WI | Aa, Ab, Ac, Ba, Bb, Bc, Ca, Cb, Cc, Cd, Ce, Cf, Cg, Da, Ea, Eb, Fa |
| North American Substation Services, LLC | Altamonte Springs, Fl | Cf |
| Osmose Utilities Services, Inc. | Peachtree City, GA | V |
| Palouse Power, LLC | Quincy, WA | Aa, Ab, Ac, Ba, Bb, Bc, Ca, Cb, Cc, Cd, Ce, Cf, Cg, Da, Ea, Eb, Fa, V |
| PAR Electrical Contractors Inc | Hubbard, OR | Aa, Ab, Ac, Ba, Bb, Bc, Ca, Cb, Cc, Cd, Ce, Cf, Cg, Da, Ea, Eb, Fa |
| Paramount Communications Inc. | Richland, WA | Ea, Eb, Fa |
| Pipkin Inc. dba Pipkin Construction | Wenatchee, WA | Cc, Ce, Da, Fa, U |
| Potelco, Inc. | Sumner, WA | Aa, Ab, Ba, Bb, Bc, Ca, Cb, Cc, Cd, Ce, Cf, Cg, Da, Ea, Eb, Fa |
| POWER CITY ELECTRIC INC | Spokane, WA | Aa, Ab, Ac, Ca, Cb, Cc, Cd, Ce, Da |
| Rayfield Brothers Excavation, Inc. | Leavenworth, Wa | Ac, Cc, Fa |
| Sturgeon Electric Company | Troutdale, OR | Aa, Ab, Ac, Ba, Bb, Bc, Ca, Cb, Cc, Cd, Ce, Cf, Cg, Da, Ea, Eb, Fa, U, V |
| TICE ELECTRIC COMPANY | Portland, OR | Ab, Ac, Ca, Cb, Cc, Cd, Ce, Cf, Cg, Da, Ea, Eb, Fa |
| Titan Electric | Tumwater, WA | Ab, Ac, Ca, Cb, Cc, Cd, Ce, Cf, Cg, Da, Ea, Eb, Fa |
| Titan Electric Inc dba FB Titan | Casper, WY | Aa, Ab, Ac, Ba, Bb, Bc, Ca, Cb, Cc, Cd, Ce, Cf, Cg, Da, Ea, Eb, Fa, U |
| Wasatch Electric, A Division of Dynalectric Co. | Salt Lake City, UT | Aa, Ab, Ac, Ba, Bb, Bc, Ca, Cb, Cc, Cd, Ce, Cf, Cg, Ea, Eb, Fa |
| Whitefish Energy Holdings, LLC | Whitefish, MT | Aa, Ac, Ba, Bc, Cc, Cd, Cf, Cg, Ea |
| Wilson Construction Co | Canby, OR | Aa, Ab, Ac, Ba, Bb, Bc, Ca, Cb, Cc, Cd, Ce, Cf, Cg, Da, Ea, Eb, Fa, U, V |