| 1 | WISX | Wisconsin Power and Light Co. | added 7/1969; 4/1970-1/1980; eliminated 1/1990; 1/1994 (not listed) | | NAKINA |
| 2 | WISX | Alliant Energy | added 4/2000; 7/2000-7/2005 | | NAKINA |
| 3 | WISX | Wisconsin Power and Light Co. | added 7/69; 4/70-1/80; eliminated 1/90; 1/94 | | NRHS |
| 4 | WISX | Alliant Energy | added 4/2000; 7/2000 | | NRHS |
| 5 | WISX | ALLIANT ENERGY [WISCONSIN POWER & LIGHT COMPANY] | | | PWRC |
| 6 | WISX | Wisconsin Power and Light | | | RSRV |
| 7 | WISX | ALLIANT ENERGY | | | SCAC4 |
