RISK MANAGEMENT AND DERIVATIVE FINANCIAL INSTRUMENTS (Details 2) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Electric
Gain / (Loss) on derivatives
Unrealized net losses applicable to financial instruments which will settle in next twelve months	$ 6,500,000		$ 6,500,000
Period within which financial instruments will settle	12 months
Amount of Gain/(Loss) Recognized on Balance Sheet	(1,435,000)	2,387,000	2,357,000	1,594,000
Amount of Gain / (Loss) Recognized in Income on Derivative	2,017,000	1,554,000	9,909,000	(975,000)
Gas
Gain / (Loss) on derivatives
Amount of Gain/(Loss) Recognized on Balance Sheet	(17,000)	82,000	(478,000)	24,000
Commodity contracts | Electric
Gain / (Loss) on derivatives
Amount of Gain/(Loss) Recognized on Balance Sheet	(2,540,000)	1,758,000	(11,077,000)	(1,002,000)
Amount of Gain / (Loss) Recognized in Income on Derivative	(1,421,000)	754,000	(3,834,000)	(1,856,000)
Commodity contracts | Gas
Gain / (Loss) on derivatives
Amount of Gain/(Loss) Recognized on Balance Sheet	(17,000)	82,000	(478,000)	24,000
Transmission congestion rights (TCR) | Electric
Gain / (Loss) on derivatives
Amount of Gain/(Loss) Recognized on Balance Sheet	1,105,000	629,000	13,434,000	2,596,000
Amount of Gain / (Loss) Recognized in Income on Derivative	$ 3,438,000	$ 800,000	$ 13,743,000	$ 881,000