Regulation (Revised Fixed Fuel Factor) (Details)	Nov. 23, 2010 PUCT Docket No. 38895	Jul. 15, 2011 PUCT Docket Number 39599	Apr. 12, 2012 Puct Docket Number 40302
Increase (Decrease) in Fuel Factor	(14.70%)	9.40%	(18.50%)