DERIVATIVE INSTRUMENTS 4 (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Interest Rate Contracts [Abstract]
Losses recognized in OCI on effective portion	$ 0		$ 0		$ 0		$ (752,000)
Losses reclassified from accumulated OCI into income	(112,000)	[1]	(112,000)	[1]	(336,000)	[1]	(482,000)	[1]
Gains or (losses) recognized in income on ineffective portion	0	[1]	0	[1]	0	[1]	0	[1]
Gain (loss) on energy related derivative instruments not designated as hedging instruments	(537,000)	[2]	(3,614,000)	[2]	(24,308,000)	[2]	6,665,000	[2]
Gain (loss) on interest rate derivative instruments not designated as hedging instruments	390,000	[1]	53,000	[1]	2,165,000	[1]	273,000	[1]
Derivative instruments not designated as hedging instruments, gain (loss), net	(147,000)		(3,561,000)		(22,143,000)		6,938,000
Realized losses, derivative instruments on energy-related contracts	400,000		3,000,000		600,000		13,700,000
Fair value derivative instruments with credit-risk-related features	31,500,000				31,500,000
Additional collateral, aggregate fair value	$ 27,900,000				$ 27,900,000

[1] Included in Interest Charges

[2] Included in Operating Revenues - Non Utility