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RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES- Rate Reduction Bonds, Principal and Interest Payments (Details) - PSNH $ in Millions	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
2025	$ 43.2
2026	43.2
2027	43.2
2028	43.2
2029	43.2
Thereafter	151.3
Total	$ 367.3

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