RATES AND REGULATORY ACTIONS (Details) (USD $)	1 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	May 31, 2013	Feb. 28, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012
Public Utilities, General Disclosures [Abstract]
BGSS refunds made to customers					$ 9,400,000
Cost requested to be recovered through EEP I, approved additional investment					2,500,000.0
Cost requested to be recovered through EEP, revenue increase		24,000,000
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				141,200,000			250,000,000.0
Investment requested to be recovered through CIRT III, annual amount of AIRP				35,300,000			50,000,000.0
Petition to adjust BGSS and CIP, revenue decrease			17,900,000
Costs requested for deferral, storm related		700,000
Investment requested to be recovered through CIRT, revenue increase			15,500,000.0			13,200,000
Investment requested to be recovered through CIRT, investments to be rolled into base rate			6,900,000			110,600,000
CIRT investments			117,500,000
Investment requested to be recovered through SHARP	$ 280,000,000
Investment requested to be recovered through SHARP, Term	7 years