RATES AND REGULATORY ACTIONS (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended
	Jun. 30, 2013	May 31, 2013	Feb. 28, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012
Public Utilities, General Disclosures [Abstract]
Cost requested to be recovered through EEP I, approved additional investment				$ 2.5
Cost requested to be recovered through EEP, revenue increase	24.0
BGSS refunds made to customers				9.4
Investment requested to be recovered through CIRT III, term of AIRP			4 years			5 years
Investment requested to be recovered through CIRT III, amount of AIRP			141.2			250.0
Investment requested to be recovered through CIRT III, annual amount of AIRP			35.3			50.0
Petition to adjust BGSS and CIP, revenue decrease		17.9
Investment requested to be recovered through CIRT, revenue increase		15.5			13.2
Investment requested to be recovered through CIRT, investments to be rolled into base rate		6.9			110.6
CIRT investments		117.5
Costs requested for deferral, storm related	$ 0.7