SUPPLEMENTARY INFORMATION (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Electric Distribution and Transmission:
Retail	$ 160,526	$ 174,307	$ 330,059	$ 361,127
Wholesale	113	61	191	61
Other operating revenue	22,797	32,745	51,412	66,201
Total Electric Distribution and Transmission Revenue	183,436	207,113	381,662	427,389
Gas Distribution:
Retail	112,049	0	430,468	0
Wholesale	15,680	0	37,512	0
Other operating revenue	2,880	0	25,453	0
Total Gas Distribution Revenue	130,609	0	493,433	0
Non-utility revenues:
Other	4	3	7	7
Total Operating Revenues	314,049	207,116	875,102	427,396
Depreciation and Amortization
Property, plant and equipment depreciation	23,793	13,191	47,438	26,146
Amortization of nuclear plant regulatory assets	10,176	10,485	20,924	22,529
Amortization of intangibles	11	13	23	23
Amortization of other regulatory assets	488	3,349	2,188	5,591
Total Amortization	10,675	13,847	23,135	28,143
Total Depreciation and Amortization	34,468	27,038	70,573	54,289
Operating:
Connecticut gross earnings	15,531	10,868	39,797	21,952
Local real estate and personal property	8,047	4,485	16,470	9,032
Payroll taxes	2,324	1,239	5,362	3,312
Other	(2)	0	(222)	0
Total Taxes - Other than Income Taxes	25,900	16,592	61,407	34,296
Other Income and (Deductions), net
Interest income	1,072	1,068	1,794	2,063
Allowance for funds used during construction - equity	2,672	1,697	5,317	2,716
Allowance for funds used during construction - debt	2,261	1,044	4,276	1,976
Conservation and Load Management incentive	271	361	542	645
Energy generation and load curtailment incentives	20	863	40	882
ISO load response, net	(251)	545	(92)	1,052
Miscellaneous other income and (deductions) - net	(441)	(674)	(1,608)	(374)
Total Other Income and (Deductions), net	5,604	4,904	10,269	8,960
Other Interest, net
Notes Payable	30	38	129	64
Other	392	100	1,600	355
Total Other Interest, net	$ 422	$ 138	$ 1,729	$ 419