1 | HHHX | Xcel Energy | added 1/2006 | | NAKINA |
2 | HHHX | Public Service Co. of Colorado | added 10/2000; eliminated 10/2002; 7/2005 (not listed) | | NAKINA |
3 | HHHX | Public Service Co. of Colorado | added 10/2000 | | NRHS |
4 | HHHX | XCEL ENERGY [PUBLIC SERVICE CO. OF COLORADO] | | | PWRC |
5 | HHHX | Public Service of Colorado | | | RSRV |
6 | HHHX | XCEL ENERGY | | | SCAC4 |