SHORT TERM AND LONG TERM DEBT	3 Months Ended
Mar. 31, 2015
Notes To Consolidated Financial Statements [Abstract]
Debt Disclosure	6. SHORT-TERM AND LONG-TERM DEBT Credit Agreements and Commercial Paper Programs: ES parent, CL&P, PSNH, WMECO, NSTAR Gas and Yankee Gas are parties to a five-year $1.45 billion revolving credit facility that expires September 6, 2019. The revolving credit facility is used primarily to backstop ES parent's $1.45 billion commercial paper program. The commercial paper program allows ES parent to issue commercial paper as a form of short-term debt. As of March 31, 2015 and December 31, 2014, ES parent had $788 million and approximately $1.1 billion, respectively, in short-term borrowings outstanding under the ES parent commercial paper program, leaving $662 million and $348.9 million of available borrowing capacity as of March 31, 2015 and December 31, 2014, respectively. The weighted-average interest rate on these borrowings as of March 31, 2015 and December 31, 2014 was 0.53 percent and 0.43 percent, respectively, which is generally based on A2/P2 rated commercial paper. As of March 31, 2015, there were intercompany loans from ES parent of $190.1 million to CL&P, $82 million to PSNH and $70.5 million to WMECO. As of December 31, 2014, there were intercompany loans from ES parent of $133.4 million to CL&P, $90.5 million to PSNH and $21.4 million to WMECO. NSTAR Electric has a five-year $450 million revolving credit facility that expires September 6, 2019. This facility serves to backstop NSTAR Electric's existing $450 million commercial paper program. As of March 31, 2015 and December 31, 2014, NSTAR Electric had $215.5 million and $302 million, respectively, in short-term borrowings outstanding under its commercial paper program, leaving $234.5 million and $148 million of available borrowing capacity as of March 31, 2015 and December 31, 2014, respectively. The weighted-average interest rate on these borrowings as of March 31, 2015 and December 31, 2014 was 0.35 percent and 0.27 percent, respectively, which is generally based on A2/P1 rated commercial paper. Except as described below, amounts outstanding under the commercial paper programs are included in Notes Payable for Eversource and NSTAR Electric and classified in current liabilities on the balance sheets as all borrowings are outstanding for no more than 364 days at one time. Intercompany loans from ES parent to CL&P, PSNH and WMECO are included in Notes Payable to ES Parent and classified in current liabilities on the balance sheets. Intercompany loans from ES parent to CL&P, PSNH and WMECO are eliminated in consolidation in Eversource's balance sheets. Long-Term Debt: On January 15, 2015, ES parent issued $150 million of 1.60 percent Series G Senior Notes, due to mature in 2018 and $300 million of 3.15 percent Series H Senior Notes, due to mature in 2025. The proceeds, net of issuance costs, were used to repay short-term borrowings outstanding under the ES parent commercial paper program. As the debt issuances refinanced short-term debt, the short-term debt was classified as Long-Term Debt as of December 31, 2014. On April 1, 2015, CL&P repaid at maturity the $100 million 5.00 percent 2005 Series A First and Refunding Mortgage Bonds using short-term borrowings. On April 1, 2015, CL&P also redeemed the $62 million 1996A Series 1.55 percent PCRBs that were subject to mandatory tender, using short term borrowings. Long-Term Debt Issuance Authorization: On April 3, 2015, the DPU authorized NSTAR Gas to issue up to $100 million in long-term debt for the period through December 31, 2015.

SHORT TERM AND LONG TERM DEBT

3 Months Ended

Mar. 31, 2015

Notes To Consolidated Financial Statements [Abstract]

6. SHORT-TERM AND LONG-TERM DEBT

Credit Agreements and Commercial Paper Programs: ES parent, CL&P, PSNH, WMECO, NSTAR Gas and Yankee Gas are parties to a five-year $1.45 billion revolving credit facility that expires September 6, 2019. The revolving credit facility is used primarily to backstop ES parent's $1.45 billion commercial paper program. The commercial paper program allows ES parent to issue commercial paper as a form of short-term debt. As of March 31, 2015 and December 31, 2014, ES parent had $788 million and approximately $1.1 billion, respectively, in short-term borrowings outstanding under the ES parent commercial paper program, leaving $662 million and $348.9 million of available borrowing capacity as of March 31, 2015 and December 31, 2014, respectively. The weighted-average interest rate on these borrowings as of March 31, 2015 and December 31, 2014 was 0.53 percent and 0.43 percent, respectively, which is generally based on A2/P2 rated commercial paper. As of March 31, 2015, there were intercompany loans from ES parent of $190.1 million to CL&P, $82 million to PSNH and $70.5 million to WMECO. As of December 31, 2014, there were intercompany loans from ES parent of $133.4 million to CL&P, $90.5 million to PSNH and $21.4 million to WMECO.

NSTAR Electric has a five-year $450 million revolving credit facility that expires September 6, 2019. This facility serves to backstop NSTAR Electric's existing $450 million commercial paper program. As of March 31, 2015 and December 31, 2014, NSTAR Electric had $215.5 million and $302 million, respectively, in short-term borrowings outstanding under its commercial paper program, leaving $234.5 million and $148 million of available borrowing capacity as of March 31, 2015 and December 31, 2014, respectively. The weighted-average interest rate on these borrowings as of March 31, 2015 and December 31, 2014 was 0.35 percent and 0.27 percent, respectively, which is generally based on A2/P1 rated commercial paper.

Except as described below, amounts outstanding under the commercial paper programs are included in Notes Payable for Eversource and NSTAR Electric and classified in current liabilities on the balance sheets as all borrowings are outstanding for no more than 364 days at one time. Intercompany loans from ES parent to CL&P, PSNH and WMECO are included in Notes Payable to ES Parent and classified in current liabilities on the balance sheets. Intercompany loans from ES parent to CL&P, PSNH and WMECO are eliminated in consolidation in Eversource's balance sheets.

Long-Term Debt: On January 15, 2015, ES parent issued $150 million of 1.60 percent Series G Senior Notes, due to mature in 2018 and $300 million of 3.15 percent Series H Senior Notes, due to mature in 2025. The proceeds, net of issuance costs, were used to repay short-term borrowings outstanding under the ES parent commercial paper program. As the debt issuances refinanced short-term debt, the short-term debt was classified as Long-Term Debt as of December 31, 2014.

On April 1, 2015, CL&P repaid at maturity the $100 million 5.00 percent 2005 Series A First and Refunding Mortgage Bonds using short-term borrowings. On April 1, 2015, CL&P also redeemed the $62 million 1996A Series 1.55 percent PCRBs that were subject to mandatory tender, using short term borrowings.

Long-Term Debt Issuance Authorization: On April 3, 2015, the DPU authorized NSTAR Gas to issue up to $100 million in long-term debt for the period through December 31, 2015.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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