CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current Assets:
Cash	$ 71,027us-gaap_Cash	$ 38,703us-gaap_Cash
Receivables, Net	1,131,434us-gaap_AccountsReceivableNetCurrent	856,346us-gaap_AccountsReceivableNetCurrent
Unbilled Revenues	229,760	211,758
Taxes Receivable	99,680us-gaap_IncomeTaxesReceivable	337,307us-gaap_IncomeTaxesReceivable
Fuel, Materials and Supplies	281,492us-gaap_EnergyRelatedInventory	349,664us-gaap_EnergyRelatedInventory
Regulatory Assets Current	747,349us-gaap_RegulatoryAssetsCurrent	672,493us-gaap_RegulatoryAssetsCurrent
Prepayments and Other Current Assets	231,949us-gaap_OtherAssetsCurrent	226,194us-gaap_OtherAssetsCurrent
Total Current Assets	2,792,691us-gaap_AssetsCurrent	2,692,465us-gaap_AssetsCurrent
Property, Plant and Equipment, Net	18,810,708	18,647,041
Deferred Debits and Other Assets:
Regulatory Assets Long Term	3,981,507us-gaap_RegulatoryAssetsNoncurrent	4,054,086us-gaap_RegulatoryAssetsNoncurrent
Goodwill	3,519,401us-gaap_Goodwill	3,519,401us-gaap_Goodwill
Marketable Securities	518,065us-gaap_MarketableSecuritiesNoncurrent	515,025us-gaap_MarketableSecuritiesNoncurrent
Other Long-Term Assets	329,393us-gaap_OtherAssetsNoncurrent	349,957us-gaap_OtherAssetsNoncurrent
Total Deferred Debits and Other Assets	8,348,366us-gaap_AssetsNoncurrent	8,438,469us-gaap_AssetsNoncurrent
Total Assets	29,951,765us-gaap_Assets	29,777,975us-gaap_Assets
Current Liabilities:
Notes Payable	1,003,500us-gaap_NotesPayable	956,825us-gaap_NotesPayable
Long-Term Debt - Current Portion	245,583us-gaap_LongTermDebtCurrent	245,583us-gaap_LongTermDebtCurrent
Accounts Payable - Current	739,324us-gaap_AccountsPayableCurrent	868,231us-gaap_AccountsPayableCurrent
Obligations to Third Party Suppliers	157,143us-gaap_AccountsPayableOtherCurrent	115,632us-gaap_AccountsPayableOtherCurrent
Deferred Tax Liabilities Current	218,582us-gaap_DeferredTaxLiabilitiesCurrent	160,288us-gaap_DeferredTaxLiabilitiesCurrent
Regulatory Liability Current	201,180us-gaap_RegulatoryLiabilityCurrent	235,022us-gaap_RegulatoryLiabilityCurrent
Other Liabilities - Current	546,470us-gaap_OtherLiabilitiesCurrent	552,800us-gaap_OtherLiabilitiesCurrent
Total Current Liabilities	3,111,782us-gaap_LiabilitiesCurrent	3,134,381us-gaap_LiabilitiesCurrent
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	4,574,630	4,467,473
Regulatory Liabilities Long-Term	524,940us-gaap_RegulatoryLiabilityNoncurrent	515,144us-gaap_RegulatoryLiabilityNoncurrent
Long-Term Derivative Liabilities	396,617us-gaap_DerivativeLiabilitiesNoncurrent	409,632us-gaap_DerivativeLiabilitiesNoncurrent
Accrued Pension, PBOP and SERP	1,605,339	1,638,558
Other Long-Term Liabilities	870,417us-gaap_OtherLiabilitiesNoncurrent	874,387us-gaap_OtherLiabilitiesNoncurrent
Total Deferred Credits and Other Liabilities	7,971,943us-gaap_LiabilitiesNoncurrent	7,905,194us-gaap_LiabilitiesNoncurrent
Capitalization:
Long-Term Debt	8,602,067us-gaap_LongTermDebtNoncurrent	8,606,017us-gaap_LongTermDebtNoncurrent
Noncontrolling Interest in Consolidated Subsidiary:
Temporary Equity, Carrying Amount, Attributable to Noncontrolling Interest	155,568	155,568
Common Shareholders' Equity:
Common Stock	1,668,039us-gaap_CommonStockValue	1,666,796us-gaap_CommonStockValue
Capital Surplus, Paid In	6,241,417us-gaap_AdditionalPaidInCapital	6,235,834us-gaap_AdditionalPaidInCapital
Retained Earnings	2,569,482	2,448,661
Accumulated Other Comprehensive Loss	(72,414)	(74,009)
Treasury Stock	(296,119)us-gaap_TreasuryStockValue	(300,467)us-gaap_TreasuryStockValue
Common Shareholders' Equity	10,110,405us-gaap_StockholdersEquity	9,976,815us-gaap_StockholdersEquity
Total Capitalization	18,868,040	18,738,400
Total Liabilities and Capitalization	29,951,765	29,777,975
The Connecticut Light And Power Company [Member]
Current Assets:
Cash	16,818	2,356
Receivables, Net	449,506	355,140
Accounts Receivable from Affiliated Companies	27,618	16,757
Unbilled Revenues	113,498	102,137
Taxes Receivable	0	116,148
Regulatory Assets Current	209,628	220,344
Materials and Supplies	48,135	46,664
Prepayments and Other Current Assets	51,074	37,822
Total Current Assets	916,277	897,368
Property, Plant and Equipment, Net	6,874,891	6,809,664
Deferred Debits and Other Assets:
Regulatory Assets Long Term	1,454,150	1,475,508
Other Long-Term Assets	171,085	177,568
Total Deferred Debits and Other Assets	1,625,235	1,653,076
Total Assets	9,416,403	9,360,108
Current Liabilities:
Notes Payable To Affiliated Companies	190,100	133,400
Long-Term Debt - Current Portion	162,000	162,000
Accounts Payable - Current	230,175	272,971
Accounts Payable to Affiliated Companies	67,063	65,594
Obligations to Third Party Suppliers	81,820	73,624
Regulatory Liability Current	84,127	124,722
Derivative Liabilities - Current	88,218	88,459
Other Liabilities - Current	207,843	153,420
Total Current Liabilities	1,111,346	1,074,190
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,652,415	1,642,805
Regulatory Liabilities Long-Term	82,110	81,298
Long-Term Derivative Liabilities	395,038	406,199
Accrued Pension, PBOP and SERP	272,292	273,854
Other Long-Term Liabilities	150,396	148,844
Total Deferred Credits and Other Liabilities	2,552,251	2,553,000
Capitalization:
Long-Term Debt	2,680,123	2,679,951
Noncontrolling Interest in Consolidated Subsidiary:
Temporary Equity, Carrying Amount, Attributable to Noncontrolling Interest	116,200	116,200
Common Shareholders' Equity:
Common Stock	60,352	60,352
Capital Surplus, Paid In	1,805,626	1,804,869
Retained Earnings	1,091,321	1,072,477
Accumulated Other Comprehensive Loss	(816)	(931)
Common Shareholders' Equity	2,956,483	2,936,767
Total Capitalization	5,752,806	5,732,918
Total Liabilities and Capitalization	9,416,403	9,360,108
NSTAR Electric Company [Member]
Current Assets:
Cash	17,897	12,773
Receivables, Net	317,410	234,481
Accounts Receivable from Affiliated Companies	8,372	40,353
Unbilled Revenues	29,228	29,741
Taxes Receivable	63,652	144,601
Fuel, Materials and Supplies	87,683	74,179
Regulatory Assets Current	309,547	198,710
Prepayments and Other Current Assets	7,885	10,815
Total Current Assets	841,674	745,653
Property, Plant and Equipment, Net	5,364,311	5,335,436
Deferred Debits and Other Assets:
Regulatory Assets Long Term	1,178,738	1,179,100
Other Long-Term Assets	55,839	73,051
Total Deferred Debits and Other Assets	1,234,577	1,252,151
Total Assets	7,440,562	7,333,240
Current Liabilities:
Notes Payable	215,500	302,000
Long-Term Debt - Current Portion	4,700	4,700
Accounts Payable - Current	233,852	217,311
Accounts Payable to Affiliated Companies	127,904	63,517
Obligations to Third Party Suppliers	63,336	34,824
Renewable Portfolio Standards Compliance Obligation	55,853	35,698
Deferred Tax Liabilities Current	111,288	55,136
Regulatory Liability Current	24,605	49,611
Other Liabilities - Current	116,128	115,991
Total Current Liabilities	953,166	878,788
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,530,972	1,527,667
Regulatory Liabilities Long-Term	268,122	262,738
Accrued Pension, PBOP and SERP	228,411	235,529
Other Long-Term Liabilities	126,006	129,279
Total Deferred Credits and Other Liabilities	2,153,511	2,155,213
Capitalization:
Long-Term Debt	1,792,717	1,792,712
Noncontrolling Interest in Consolidated Subsidiary:
Temporary Equity, Carrying Amount, Attributable to Noncontrolling Interest	43,000	43,000
Common Shareholders' Equity:
Common Stock	0	0
Capital Surplus, Paid In	995,378	994,130
Retained Earnings	1,502,528	1,468,955
Accumulated Other Comprehensive Loss	262	442
Common Shareholders' Equity	2,498,168	2,463,527
Total Capitalization	4,333,885	4,299,239
Total Liabilities and Capitalization	7,440,562	7,333,240
Public Service Company Of New Hampshire [Member]
Current Assets:
Cash	5,149	489
Receivables, Net	99,748	80,151
Accounts Receivable from Affiliated Companies	9,917	3,194
Unbilled Revenues	43,359	40,181
Taxes Receivable	31,147	14,571
Fuel, Materials and Supplies	113,566	148,139
Regulatory Assets Current	99,994	111,705
Prepayments and Other Current Assets	13,520	27,821
Total Current Assets	416,400	426,251
Property, Plant and Equipment, Net	2,666,312	2,635,844
Deferred Debits and Other Assets:
Regulatory Assets Long Term	287,203	293,115
Other Long-Term Assets	33,517	39,228
Total Deferred Debits and Other Assets	320,720	332,343
Total Assets	3,403,432	3,394,438
Current Liabilities:
Notes Payable To Affiliated Companies	82,000	90,500
Accounts Payable - Current	62,513	93,349
Accounts Payable to Affiliated Companies	42,670	33,734
Deferred Tax Liabilities Current	34,217	36,164
Regulatory Liability Current	16,102	16,044
Other Liabilities - Current	39,777	38,969
Total Current Liabilities	277,279	308,760
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	627,450	587,292
Regulatory Liabilities Long-Term	51,897	51,372
Accrued Pension, PBOP and SERP	91,847	93,243
Other Long-Term Liabilities	45,088	50,155
Total Deferred Credits and Other Liabilities	816,282	782,062
Capitalization:
Long-Term Debt	1,076,303	1,076,286
Common Shareholders' Equity:
Common Stock	0	0
Capital Surplus, Paid In	748,634	748,240
Retained Earnings	492,004	486,459
Accumulated Other Comprehensive Loss	(7,070)	(7,369)
Common Shareholders' Equity	1,233,568	1,227,330
Total Capitalization	2,309,871	2,303,616
Total Liabilities and Capitalization	3,403,432	3,394,438
Western Massachusetts Electric Company [Member]
Current Assets:
Cash	2,045	0
Receivables, Net	72,366	51,066
Accounts Receivable from Affiliated Companies	8,726	7,851
Unbilled Revenues	18,186	15,146
Taxes Receivable	18,062	18,126
Regulatory Assets Current	66,706	51,923
Marketable Securities - Current	33,183	28,658
Prepayments and Other Current Assets	6,431	7,607
Total Current Assets	225,705	180,377
Property, Plant and Equipment, Net	1,483,895	1,461,321
Deferred Debits and Other Assets:
Regulatory Assets Long Term	137,894	146,307
Marketable Securities	25,027	29,452
Other Long-Term Assets	22,726	22,018
Total Deferred Debits and Other Assets	185,647	197,777
Total Assets	1,895,247	1,839,475
Current Liabilities:
Notes Payable To Affiliated Companies	70,500	21,400
Long-Term Debt - Current Portion	50,000	50,000
Accounts Payable - Current	40,665	53,732
Accounts Payable to Affiliated Companies	21,634	14,328
Deferred Tax Liabilities Current	24,607	18,089
Regulatory Liability Current	22,289	22,486
Other Liabilities - Current	22,958	24,080
Total Current Liabilities	252,653	204,115
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	419,043	416,822
Regulatory Liabilities Long-Term	12,673	10,835
Accrued Pension, PBOP and SERP	16,505	17,705
Other Long-Term Liabilities	34,182	33,747
Total Deferred Credits and Other Liabilities	482,403	479,109
Capitalization:
Long-Term Debt	578,239	578,471
Common Shareholders' Equity:
Common Stock	10,866	10,866
Capital Surplus, Paid In	391,398	391,256
Retained Earnings	182,778	178,834
Accumulated Other Comprehensive Loss	(3,090)	(3,176)
Common Shareholders' Equity	581,952	577,780
Total Capitalization	1,160,191	1,156,251
Total Liabilities and Capitalization	$ 1,895,247	$ 1,839,475

The current obligation PSNH has in order to meet renewable compliance standards.

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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred and payable, which are not elsewhere specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Period end amount of total net PPE.

+ References

No definition available.

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As of the reporting date, the carrying amount of noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. The noncontrolling interest holder's ownership (or holders' ownership) may be in the form of preferred shares (regardless of class), preferred partnership units (regardless of class), preferential membership interests, or any other form of preferred equity regardless of investee entity legal form.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 480

-SubTopic 10

-Section S99

-Paragraph 3A

-Subparagraph 14

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-Name Accounting Standards Codification

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-Subparagraph (16)(c)

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-Name Accounting Standards Codification

-Topic 480

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-Paragraph 3A

-Subparagraph 15

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-Name Accounting Standards Codification

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-SubTopic 10

-Section S99

-Paragraph 3A

-Subparagraph (12)(c)

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 980

-SubTopic 340

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

+ References

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The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 980

-SubTopic 405

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394

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The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period.

+ References

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- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

-Article 5

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.31(a)(3))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

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-Subparagraph (SAB TOPIC 4.E)

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-Name Staff Accounting Bulletin (SAB)

-Number Topic 4

-Section E

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-Name Accounting Standards Codification

-Topic 210

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29-31)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30, 31

-Article 5

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- Definition

The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656

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