SUPPLEMENTARY INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Depreciation and Amortization
Property, plant and equipment depreciation	$ 32,860	$ 30,870	$ 97,208	$ 89,788
Amortization of regulatory assets	2,718	19,891	15,200	56,749
Total Depreciation and Amortization	35,578	50,761	112,408	146,537
Taxes - Other than Income Taxes - Operating:
Connecticut gross earnings	16,199	17,780	54,671	54,873
Local real estate and personal property	13,310	12,417	37,399	34,416
Payroll taxes	3,046	2,069	9,877	6,584
Other	342	123	1,027	462
Total Taxes - Other than Income Taxes	32,897	32,389	102,974	96,335
Other Income and (Deductions)
Interest income	666	243	1,731	1,449
Allowance for funds used during construction - equity	1,949	2,751	6,869	8,085
Allowance for funds used during construction - debt	1,201	1,533	4,032	5,869
Weather insurance	0	0	(2,437)	0
Other	520	626	2,627	315
Total Other Income and (Deductions)	$ 4,336	$ 5,153	$ 12,822	$ 15,718