SUPPLEMENTARY INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Depreciation and Amortization
Property, plant and equipment depreciation	$ 30,870	$ 28,648	$ 89,788	$ 83,143
Amortization of nuclear plant regulatory assets	16,782	14,272	39,935	35,433
Amortization of other regulatory assets	3,105	3,346	16,785	17,272
Other amortization	4	13	29	38
Total Amortization	19,891	17,631	56,749	52,743
Total Depreciation and Amortization	50,761	46,279	146,537	135,886
Taxes - Other than Income Taxes
Connecticut gross earnings	17,780	16,438	54,873	48,290
Local real estate and personal property	12,417	10,866	34,416	29,630
Payroll taxes	2,069	1,117	6,584	4,747
Other	123	81	462	257
Total Taxes - Other than Income Taxes	32,389	28,502	96,335	82,924
Other Income and (Deductions), net
Interest income	243	645	1,449	1,720
Allowance for funds used during construction - equity	2,751	1,589	8,085	5,473
Allowance for funds used during construction - debt	1,533	1,427	5,869	5,231
Weather Insurance	0	0	0	3,488
TSO Incentives	0	2,745	0	2,745
Miscellaneous other income and (deductions) - net	626	1,010	315	2,548
Total Other Income and (Deductions), net	$ 5,153	$ 7,416	$ 15,718	$ 21,205