| 1 | VALX | Sierra Pacific Power Co. | added 1/1981; eliminated 4/1981 | | NAKINA |
| 2 | VALX | Sierra Pacific Power Co./Idaho Power Co. | added 4/1981; 1/1994-7/2000; eliminated 7/2004; 7/2005 (not listed) | | NAKINA |
| 3 | VALX | Sierra Pacific Power Co. | added 1/81; eliminated 4/81 | | NRHS |
| 4 | VALX | Sierra Pacific Power Co./Idaho Power Co. | added 4/81; 1/94-7/2000 | | NRHS |
| 5 | VALX | SIERRA PACIFIC POWER CO. / IDAHO POWER CO. | | | PWRC |
| 6 | VALX | Sierra Pacific Power (Idaho Power) | | | RSRV |
| 7 | VALX | SIERRA PACIFIC POWER CO./IDAHO POWE | | | SCAC4 |