Energy Cost Adjustment
The ECA applies to all electric rate schedules and is in addition to charges itemized in the Master Tariff. (W System ECA effective November 2004)
| Billing Month | M System | W System |
| July 2009 | ($0.003240) | ($0.005610) |
| June 2009 | ($0.000030) | ($0.005380) |
| May 2009 | ($0.002300) | ($0.009210) |
| April 2009 | ($0.002150) | ($0.007280) |
| March 2009 | ($0.005230) | ($0.010020) |
| February 2009 | ($0.005040) | ($0.007730) |
| January 2009 | ($0.003460) | ($0.004020) |
| December 2008 | ($0.002590) | ($0.004640) |
| November 2008 | ($0.002040) | ($0.006000) |
| October 2008 | $0.000740 | ($0.004540) |
| September 2008 | $0.020260 | $0.009780 |
| September 2008 | $0.027080 | $0.024650 |
| August 2008 | $0.020750 | $0.022960 |
| July 2008 | $0.014200 | $0.017550 |
| June 2008 | $0.018950 | $0.017120 |
| May 2008 | $0.009400 | $0.010040 |
| April 2008 | $0.001910 | $0.006870 |
| March 2008 | $0.004850 | $0.013390 |
| February 2008 | $0.004070 | $0.010850 |
| January 2008 | $0.004210 | $0.005760 |
| December 2007 | $0.007920 | $0.014460 |
| November 2007 | $0.007480 | $0.011350 |
| October 2007 | $0.012820 | $0.017290 |
| September 2007 | $0.007180 | $0.008590 |
| August 2007 | $0.002160 | $0.008480 |
| July 2007 | $0.010580 | $0.016030 |
| June 2007 | $0.007230 | $0.007070 |
| May 2007 | $0.001350 | $0.004210 |
| April 2007 | $0.008490 | $0.009680 |
| March 2007 | ($0.002270) | $0.001000 |
| February 2007 | ($0.001950) | $0.001000 |
| January 2007 | $0.001580 | $0.006380 |
| December 2006 | $0.008140 | $0.008500 |
| November 2006 | $0.004320 | $0.005530 |
| October 2006 | $0.012860 | $0.022000 |
| September 2006 | $0.012430 | $0.020650 |
| August 2006 | $0.006130 | $0.015140 |
| July 2006 | $0.014460 | $0.004070 |
| June 2006 | $0.015410 | $0.010340 |
| May 2006 | $0.008260 | $0.004750 |
| April 2006 | $0.000900 | ($0.000170) |
| March 2006 | $0.000660 | ($0.000980) |
| February 2006 | ($0.003050) | $0.008960 |
| January 2006 | $0.002650 | ($0.000450) |
| December 2005 | ($0.000020) | $0.004120 |
| November 2005 | $0.001060 | $0.007760 |
| October 2005 | $0.004750 | $0.014390 |
| September 2005 | $0.004330 | $0.012390 |
| August 2005 | $0.005710 | $0.013550 |
| July 2005 | $0.004150 | $0.005110 |
| June 2005 | $0.003460 | $0.001900 |
| May 2005 | $0.000390 | $0.002320 |
| April 2005 | $0.000880 | $0.003480 |
| March 2005 | ($0.002950) | ($0.002090) |
| February 2005 | ($0.001470) | ($0.002100) |
| January 2005 | ($0.000220) | ($0.000210) |
| December 2004 | $0.004020 | $0.003790 |
| November 2004 | $0.007130 | $0.000000 |
| October 2004 | ($0.000200) | $0.000000 |
| September 2004 | $0.000940 | $0.000000 |
| August 2004 | $0.002420 | $0.000000 |
| July 2004 | $0.002960 | $0.000000 |
| June 2004 | $0.008020 | $0.000000 |
| May 2004 | $0.010470 | $0.000000 |
| April 2004 | $0.006610 | $0.000000 |
| March 2004 | $0.002340 | $0.000000 |
| February 2004 | $0.003320 | $0.000000 |
| January 2004 | $0.000040 | $0.000000 |
| December 2003 | ($0.001100) | $0.000000 |
| November 2003 | $0.000220 | $0.000000 |
| October 2003 | ($0.001150) | $0.000000 |
| September 2003 | ($0.000870) | $0.000000 |
| August 2003 | $0.000840 | $0.000000 |
| July 2003 | $0.002700 | $0.000000 |
| June 2003 | $0.005870 | $0.000000 |
| May 2003 | $0.005070 | $0.000000 |
| April 2003 | $0.004330 | $0.000000 |
| March 2003 | $0.001440 | $0.000000 |
| March 2003 | $0.007030 | $0.000000 |
| February 2003 | $0.007712 | $0.000000 |
| January 2003 | $0.008146 | $0.000000 |
| December 2002 | $0.008029 | $0.000000 |
| November 2002 | $0.005982 | $0.000000 |
| October 2002 | $0.003061 | $0.000000 |
| September 2002 | $0.001326 | $0.000000 |
| August 2002 | $0.004317 | $0.000000 |
| July 2002 | $0.005991 | $0.000000 |
| June 2002 | $0.008502 | $0.000000 |
| May 2002 | $0.007708 | $0.000000 |
| April 2002 | $0.008246 | $0.000000 |
| March 2002 | $0.005389 | $0.000000 |
| February 2002 | $0.006837 | $0.000000 |
| January 2002 | $0.008942 | $0.000000 |
| December 2001 | $0.007340 | $0.000000 |
| November 2001 | $0.005352 | $0.000000 |
| October 2001 | $0.002413 | $0.000000 |
| September 2001 | $0.004039 | $0.000000 |
| August 2001 | $0.004875 | $0.000000 |
| July 2001 | $0.003168 | $0.000000 |
| June 2001 | $0.006844 | $0.000000 |
| May 2001 | $0.007686 | $0.000000 |
| April 2001 | $0.004348 | $0.000000 |
| March 2001 | $0.000580 | $0.000000 |
| February 2001 | $0.004843 | $0.000000 |
| January 2001 | $0.010497 | $0.000000 |
| December 2000 | $0.001132 | $0.000000 |
| November 2000 | $0.004055 | $0.000000 |
| October 2000 | $0.000491 | $0.000000 |
| September 2000 | ($0.006500) | $0.000000 |
| August 2000 | $0.003830 | $0.000000 |
| July 2000 | $0.004623 | $0.000000 |
| June 2000 | $0.006676 | $0.000000 |
| May 2000 | $0.003306 | $0.000000 |
| April 2000 | $0.003406 | $0.000000 |