Comparison shows Integrys' fixed rate for ComEd residential delivery classes without electric space heat for 12, 24, or 36 Billing Cycles or Ameren’s delivery classes without electric space heat for 12 Billing Cycles for October 2011 to May 2012 fixed rate as set forth on ICC's Plug In Illinois website. ComEd's rate includes ComEd's electric supply charge plus ComEd's transmission services charge and Ameren’s rate is for Rate Zone I, II, or III and includes Ameren's electric supply charge plus Ameren's transmission services charge. Neither the Integrys price nor the comparison prices include delivery charges or a "purchased electricity adjustment". ComEd's and Ameren’s rates will change each June and October. A 12, 24, or 36 month contract is required and there are fees for early termination. There is no guarantee of savings off of future ComEd or Ameren rates.