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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred Stock Not Subject to Mandatory Redemption | $ 155,568 | $ 155,569
Rate Reduction Bonds | 345,677 | 367,282
Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred Stock Not Subject to Mandatory Redemption | 155,600 | 155,600
Long-Term Debt | 27,164,300 | 24,413,500
Rate Reduction Bonds | 388,900 | 410,500
Fair Value | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred Stock Not Subject to Mandatory Redemption | 121,800 | 122,200
Long-Term Debt | 25,027,700 | 22,855,200
Rate Reduction Bonds | 368,800 | 395,000
CL&P |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred Stock Not Subject to Mandatory Redemption | 116,200 | 116,200
CL&P | Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred Stock Not Subject to Mandatory Redemption | 116,200 | 116,200
Long-Term Debt | 4,954,100 | 4,814,400
Rate Reduction Bonds | 0 | 0
CL&P | Fair Value | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred Stock Not Subject to Mandatory Redemption | 89,600 | 90,400
Long-Term Debt | 4,537,700 | 4,572,000
Rate Reduction Bonds | 0 | 0
NSTAR Electric |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred Stock Not Subject to Mandatory Redemption | 43,000 | 43,000
NSTAR Electric | Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred Stock Not Subject to Mandatory Redemption | 43,000 | 43,000
Long-Term Debt | 5,093,000 | 4,496,900
Rate Reduction Bonds | 0 | 0
NSTAR Electric | Fair Value | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred Stock Not Subject to Mandatory Redemption | 32,200 | 31,800
Long-Term Debt | 4,723,900 | 4,273,700
Rate Reduction Bonds | 0 | 0
PSNH |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Rate Reduction Bonds | 345,677 | 367,282
PSNH | Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred Stock Not Subject to Mandatory Redemption | 0 | 0
Long-Term Debt | 1,731,500 | 1,431,600
Rate Reduction Bonds | 388,900 | 410,500
PSNH | Fair Value | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Preferred Stock Not Subject to Mandatory Redemption | 0 | 0
Long-Term Debt | 1,527,200 | 1,292,600
Rate Reduction Bonds | $ 368,800 | $ 395,000

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