REGULATORY ACCOUNTING (Tables)

12 Months Ended

Dec. 31, 2025

Regulated Operations [Abstract]

Schedule of Components of Regulatory Assets

The components of regulatory assets were as follows:

	As of December 31,
	2025								2024
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Storm Costs, Net	$	1,959.3	$	991.3	$	499.6	$	468.4	$	2,039.4	$	971.1	$	609.8	$	458.5
Regulatory Tracking Mechanisms	1,573.8		206.5		705.6		93.2		1,781.6		507.7		650.0		162.8
Income Taxes, Net	1,044.5		546.1		161.5		23.3		968.4		521.0		145.4		20.7
Benefit Costs	992.8		173.7		300.0		61.7		967.4		168.8		293.6		65.6
Derivative Contracts	753.2		0.1		753.1		—		57.2		57.2		—		—
Securitized Stranded Costs	306.1		—		—		306.1		349.3		—		—		349.3
Cost of Removal	262.5		—		8.1		—		198.4		—		8.5		—
Goodwill-related	230.4		—		197.8		—		247.2		—		212.3		—
Asset Retirement Obligations	162.8		44.2		84.6		5.4		150.2		41.2		78.3		5.1
Environmental Remediation Costs	136.1		—		—		—		116.2		—		—		—
EGMA Acquisition and Integration Costs	82.3		—		—		—		—		—		—		—
Other Regulatory Assets	189.9		19.5		92.0		3.0		195.4		58.5		109.2		3.7
Total Regulatory Assets	7,693.7		1,981.4		2,802.3		961.1		7,070.7		2,325.5		2,107.1		1,065.7
Less:  Current Portion	1,975.1		265.2		978.8		119.9		2,189.7		638.5		902.8		173.3
Total Long-Term Regulatory Assets	$	5,718.6	$	1,716.2	$	1,823.5	$	841.2	$	4,881.0	$	1,687.0	$	1,204.3	$	892.4

Schedule of Components of Regulatory Liabilities

The components of regulatory liabilities were as follows:

	As of December 31,
	2025								2024
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
EDIT due to Tax Cuts and Jobs Act of 2017	$	2,423.4	$	933.3	$	847.9	$	319.8	$	2,442.7	$	956.6	$	877.6	$	330.6
Regulatory Tracking Mechanisms	1,186.6		457.3		535.2		111.2		702.4		180.3		413.6		114.4
Cost of Removal	867.1		275.1		479.4		45.5		684.1		212.8		451.3		20.1
Deferred Portion of Non-Service Income    Components of Pension, SERP and PBOP	509.4		72.8		252.5		48.5		427.1		61.6		211.6		42.6
AFUDC - Transmission	179.4		72.0		107.4		—		154.8		65.1		89.7		—
Derivative Contract	91.0		—		91.0		—		—		—		—		—
Benefit Costs	80.4		8.8		24.5		6.8		69.3		4.5		21.4		3.9
Other Regulatory Liabilities	200.8		43.3		15.0		4.0		184.5		39.1		14.2		4.5
Total Regulatory Liabilities	5,538.1		1,862.6		2,352.9		535.8		4,664.9		1,520.0		2,079.4		516.1
Less:  Current Portion	1,264.6		417.5		650.8		118.4		632.3		124.1		436.3		121.1
Total Long-Term Regulatory Liabilities	$	4,273.5	$	1,445.1	$	1,702.1	$	417.4	$	4,032.6	$	1,395.9	$	1,643.1	$	395.0