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ASSET RETIREMENT OBLIGATIONS (Tables)

12 Months Ended

Dec. 31, 2024

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Change in Asset Retirement Obligation

A reconciliation of the beginning and ending carrying amounts of ARO liabilities is as follows:

			As of December 31,
			2024																								2023
(Millions of Dollars)			Eversource						CL&P						NSTAR Electric						PSNH						Eversource						CL&P						NSTAR Electric						PSNH
Balance as of Beginning of Year			$	505.8					$	39.9					$	104.8					$	5.2					$	502.7					$	37.4					$	101.3					$	4.9
Liabilities Settled During the Year			(24.6)						—						—						—						(24.9)						—						—						—
Accretion			29.5						2.6						4.5						0.4						29.2						2.5						4.3						0.3
Revisions in Estimated Cash Flows			80.2						—						—						—						(1.2)						—						(0.8)						—
Balance as of End of Year			$	590.9					$	42.5					$	109.3					$	5.6					$	505.8					$	39.9					$	104.8					$	5.2

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- References

No definition available.

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- Definition

Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

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