Regulation (Revised Fixed Fuel Factor) (Details)	Sep. 30, 2011	Nov. 23, 2010 PUCT Docket No. 38895 [Member]	Jul. 15, 2011 PUCT Docket Number 39599 [Member]
Date Filed		November 23, 2010	July 15, 2011
Date Approved		January 6, 2011	August 30, 2011
Increase (Decrease) in Fuel Factor	11.00%	(14.70%)	9.40%
Effective Billing Month		January 2011	August 2011