CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Current Assets:
Cash and Cash Equivalents	$ 303,810,000	$ 38,165,000
Receivables, Net	1,086,282,000	925,083,000
Unbilled Revenues	164,082,000	201,361,000
Fuel, Materials, Supplies and Inventory	264,171,000	223,063,000
Regulatory Assets	683,211,000	741,868,000
Prepayments and Other Current Assets	210,534,000	138,009,000
Assets Held for Sale	59,346,000	219,550,000
Total Current Assets	2,771,436,000	2,487,099,000
Property, Plant and Equipment, Net	23,958,688,000	23,617,463,000
Deferred Debits and Other Assets:
Regulatory Assets	4,655,521,000	4,497,447,000
Goodwill	4,427,266,000	4,427,266,000
Marketable Securities	580,446,000	585,419,000
Other Long-Term Assets	646,626,000	605,692,000
Total Deferred Debits and Other Assets	10,309,859,000	10,115,824,000
Total Assets	37,039,983,000	36,220,386,000
Current Liabilities:
Notes Payable	1,049,305,000	1,088,087,000
Notes Payable to Eversource Parent	276,300,000	115,900,000
Long-Term Debt – Current Portion	1,097,288,000	549,631,000
Accounts Payable	984,343,000	1,085,034,000
Regulatory Liabilities	205,970,000	128,071,000
Other Current Liabilities	759,112,000	738,222,000
Total Current Liabilities	4,096,018,000	3,589,045,000
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	3,389,606,000	3,297,518,000
Regulatory Liabilities	3,703,735,000	3,637,273,000
Derivative Liabilities	415,402,000	377,257,000
Accrued Pension, SERP and PBOP	1,026,181,000	1,228,091,000
Other Long-Term Liabilities	1,053,765,000	1,073,501,000
Total Deferred Credits and Other Liabilities	9,588,689,000	9,613,640,000
Capitalization:
Long-Term Debt	12,015,992,000	11,775,889,000
Noncontrolling Interest – Preferred Stock of Subsidiaries	155,570,000	155,570,000
Common Shareholders' Equity:
Common Shares	1,669,392,000	1,669,392,000
Capital Surplus, Paid In	6,224,620,000	6,239,940,000
Retained Earnings	3,670,603,000	3,561,084,000
Accumulated Other Comprehensive Loss	(63,130,000)	(66,403,000)
Treasury Stock	(317,771,000)	(317,771,000)
Common Stockholder's Equity	11,183,714,000	11,086,242,000
Total Capitalization	23,355,276,000	23,017,701,000
Total Liabilities and Capitalization	37,039,983,000	36,220,386,000
The Connecticut Light And Power Company
Current Assets:
Cash and Cash Equivalents	240,217,000	6,028,000
Receivables, Net	411,437,000	370,676,000
Accounts Receivable from Affiliated Companies	29,122,000	28,181,000
Unbilled Revenues	48,763,000	54,154,000
Materials, Supplies and Inventory	53,637,000	48,438,000
Regulatory Assets	229,735,000	200,281,000
Prepayments and Other Current Assets	56,413,000	46,926,000
Total Current Assets	1,069,324,000	754,684,000
Property, Plant and Equipment, Net	8,406,595,000	8,271,030,000
Deferred Debits and Other Assets:
Regulatory Assets	1,499,588,000	1,444,935,000
Other Long-Term Assets	171,092,000	159,597,000
Total Deferred Debits and Other Assets	1,670,680,000	1,604,532,000
Total Assets	11,146,599,000	10,630,246,000
Current Liabilities:
Notes Payable to Eversource Parent	0	69,500,000
Long-Term Debt – Current Portion	550,000,000	300,000,000
Accounts Payable	346,676,000	367,605,000
Accounts Payable to Affiliated Companies	90,481,000	82,201,000
Regulatory Liabilities	66,949,000	38,967,000
Other Current Liabilities	264,064,000	234,486,000
Total Current Liabilities	1,318,170,000	1,092,759,000
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,133,045,000	1,103,367,000
Regulatory Liabilities	1,136,361,000	1,112,136,000
Derivative Liabilities	415,036,000	376,918,000
Accrued Pension, SERP and PBOP	266,824,000	354,469,000
Other Long-Term Liabilities	124,056,000	128,135,000
Total Deferred Credits and Other Liabilities	3,075,322,000	3,075,025,000
Capitalization:
Long-Term Debt	3,003,562,000	2,759,135,000
Noncontrolling Interest – Preferred Stock of Subsidiaries	116,200,000	116,200,000
Common Shareholders' Equity:
Common Shares	60,352,000	60,352,000
Capital Surplus, Paid In	2,119,765,000	2,110,765,000
Retained Earnings	1,452,919,000	1,415,741,000
Accumulated Other Comprehensive Loss	309,000	269,000
Common Stockholder's Equity	3,633,345,000	3,587,127,000
Total Capitalization	6,753,107,000	6,462,462,000
Total Liabilities and Capitalization	11,146,599,000	10,630,246,000
NSTAR Electric Company
Current Assets:
Cash and Cash Equivalents	9,471,000	1,763,000
Receivables, Net	406,599,000	341,341,000
Accounts Receivable from Affiliated Companies	26,335,000	40,723,000
Unbilled Revenues	41,213,000	49,865,000
Fuel, Materials, Supplies and Inventory	132,943,000	95,517,000
Regulatory Assets	276,962,000	333,882,000
Prepayments and Other Current Assets	42,250,000	24,499,000
Total Current Assets	935,773,000	887,590,000
Property, Plant and Equipment, Net	8,323,826,000	8,246,494,000
Deferred Debits and Other Assets:
Regulatory Assets	1,287,282,000	1,190,575,000
Prepaid PBOP	133,650,000	126,948,000
Other Long-Term Assets	86,898,000	84,766,000
Total Deferred Debits and Other Assets	1,507,830,000	1,402,289,000
Total Assets	10,767,429,000	10,536,373,000
Current Liabilities:
Notes Payable	367,000,000	234,000,000
Notes Payable to Eversource Parent		198,000,000
Accounts Payable	329,558,000	340,115,000
Accounts Payable to Affiliated Companies	137,132,000	91,260,000
Obligations to Third Party Suppliers	101,654,000	88,721,000
Renewable Portfolio Standards Compliance Obligations	139,174,000	111,524,000
Regulatory Liabilities	89,230,000	79,562,000
Other Current Liabilities	57,333,000	79,916,000
Total Current Liabilities	1,221,081,000	1,025,098,000
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,297,365,000	1,275,814,000
Regulatory Liabilities	1,530,103,000	1,514,451,000
Accrued Pension, SERP and PBOP	80,248,000	89,995,000
Other Long-Term Liabilities	197,371,000	198,176,000
Total Deferred Credits and Other Liabilities	3,105,087,000	3,078,436,000
Capitalization:
Long-Term Debt	2,943,915,000	2,943,759,000
Noncontrolling Interest – Preferred Stock of Subsidiaries	43,000,000	43,000,000
Common Shareholders' Equity:
Common Shares	0	0
Capital Surplus, Paid In	1,595,442,000	1,502,942,000
Retained Earnings	1,860,621,000	1,944,961,000
Accumulated Other Comprehensive Loss	(1,717,000)	(1,823,000)
Common Stockholder's Equity	3,454,346,000	3,446,080,000
Total Capitalization	6,441,261,000	6,432,839,000
Total Liabilities and Capitalization	10,767,429,000	10,536,373,000
Public Service Company Of New Hampshire
Current Assets:
Cash and Cash Equivalents	2,917,000	900,000
Receivables, Net	94,179,000	92,774,000
Accounts Receivable from Affiliated Companies	10,253,000	5,297,000
Unbilled Revenues	41,444,000	49,448,000
Taxes Receivable	34,871,000	5,838,000
Fuel, Materials, Supplies and Inventory	49,582,000	40,285,000
Regulatory Assets	122,481,000	130,134,000
Prepayments and Other Current Assets	15,918,000	23,093,000
Assets Held for Sale	59,346,000	219,550,000
Total Current Assets	430,991,000	567,319,000
Property, Plant and Equipment, Net	2,693,951,000	2,642,274,000
Deferred Debits and Other Assets:
Regulatory Assets	816,194,000	810,677,000
Other Long-Term Assets	53,656,000	42,391,000
Total Deferred Debits and Other Assets	869,850,000	853,068,000
Total Assets	3,994,792,000	4,062,661,000
Current Liabilities:
Notes Payable to Eversource Parent	271,300,000	262,900,000
Long-Term Debt – Current Portion	110,000,000	110,000,000
Accounts Payable	94,498,000	128,685,000
Accounts Payable to Affiliated Companies	33,828,000	24,676,000
Dividends Payable to Eversource Parent	0	150,000,000
Renewable Portfolio Standards Compliance Obligations	35,447,000	27,765,000
Regulatory Liabilities	15,607,000	6,251,000
Other Current Liabilities	59,876,000	40,159,000
Total Current Liabilities	620,556,000	750,436,000
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	490,487,000	443,468,000
Regulatory Liabilities	449,588,000	444,397,000
Accrued Pension, SERP and PBOP	121,414,000	124,639,000
Other Long-Term Liabilities	34,990,000	56,689,000
Total Deferred Credits and Other Liabilities	1,096,479,000	1,069,193,000
Capitalization:
Long-Term Debt	891,801,000	892,438,000
Common Shareholders' Equity:
Common Shares	0	0
Capital Surplus, Paid In	843,134,000	843,134,000
Retained Earnings	546,475,000	511,382,000
Accumulated Other Comprehensive Loss	(3,653,000)	(3,922,000)
Common Stockholder's Equity	1,385,956,000	1,350,594,000
Total Capitalization	2,277,757,000	2,243,032,000
Total Liabilities and Capitalization	$ 3,994,792,000	$ 4,062,661,000