Number of Consumers by Consumer Class
| Year | Total | Residential | Commercial | Industrial |
| 2007 | 1,196,149 | 1,101,863 | 93,015 | 1,271 |
| 2006 | 1,178,246 | 1,085,509 | 91,481 | 1,256 |
| 2005 | 1,158,281 | 1,066,302 | 90,577 | 1,402 |
| 2004 | 1,118,525 | 1,029,389 | 87,919 | 1,217 |
| 2003 | 1,085,283 | 996,564 | 87,202 | 1,517 |
| 2002 | 1,070,375 | 982,521 | 86,328 | 1,517 |
| 2001 | 1,027,682 | 941,582 | 84,839 | 1,261 |
| 2000 | 995,262 | 907,855 | 84,646 | 2,761 |
| 1999 | 977,373 | 893,887 | 80,500 | 2,986 |
| 1998 | 927,627 | 847,938 | 77,220 | 2,469 |
| 1997 | 894,243 | 812,866 | 78,986 | 2,391 |
| 1996 | 870,091 | 789,985 | 77,284 | 2,822 |
| 1995 | 830,505 | 753,003 | 74,690 | 2,812 |
| 1994 | 796,423 | 721,495 | 72,188 | 2,740 |
| 1993 | 762,928 | 690,061 | 70,161 | 2,706 |
| 1992 | 735,230 | 664,500 | 69,629 | 1,101 |
| 1991 | 720,356 | 651,203 | 67,997 | 1,156 |
| 1990 | 687,563 | 622,883 | 63,751 | 929 |