| Basin Tree Service & Pest Control, Inc. | Ephrata, WA | T, U |
| Batchelor Excavation, LLC | Manson, WA | Cc, Fa, U |
| Cascade Cable Constructors, Inc. | Spokane, WA | Ab, Ac, Bb, Ea, Eb, Fa |
| Davey Tree Surgery Company | Livermore, CA | T, U, V |
| Electrical Utility Services LLC | Davenport, WA | Aa, Ab, Ac, Ca, Cb, Cc, Cd, Ce, Cf, Da, Ea, Eb, Fa |
| Hurst Construction LLC | Wenatchee, WA | Cc, Ce, Fa, U |
| Intec Services, Inc. | Fort Collins, CO | V |
| Kemp West, Inc. | Snohomish, WA | T, U |
| Magnum Power, LLC | Castle Rock, WA | Aa, Ab, Ac, Ba, Bb, Bc, Ca, Cb, Cc, Cd, Ce, Cf, Cg, Da, Ea, Eb, Fa, T, 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 | Ca, Cb, Cf |
| 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 |
| Pennington Construction | Wenatchee , WA | Cc, Ce, Fa |
| Pipkin Inc. dba Pipkin Construction | Wenatchee, WA | Ab, Ac, 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 |
| Selland Construction, Inc | Wenatchee, WA | Fa |
| Smith Excavation | Cashmere, WA | 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 |
| Summit Line Construction | Heber City, UT | Aa, Ab, Ac, Ba, Bb, Bc, Ca, Cb, Cc, Cd, Ce, Cf, Cg, Ea, Eb, Fa |
| TICE ELECTRIC COMPANY | Portland, OR | Ab, Ac, Ca, Cb, Cc, Cd, Ce, Cf, Cg, Da, Ea, Eb, Fa |
| Titan Electric Inc | Casper, WY | Aa, Ab, Ac, Ba, Bb, Bc, Ca, Cb, Cc, Cd, Ce, Cf, Cg, Da, Ea, Eb, Fa, U |
| VECA Electric & Technologies | Seattle, WA | Ab, Ac, Ca, Cb, Cc, Cd, Ce |
| 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, Ab, Ac, Ba, Bc, Ca, Cb, Cc, Cd, Cf, Cg, Da, 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 |