PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION (Tables)

12 Months Ended

Dec. 31, 2025

Property, Plant and Equipment [Abstract]

Schedule of Utility Property, Plant and Equipment

The following tables summarize property, plant and equipment by asset category:

Eversource	As of December 31,
(Millions of Dollars)	2025		2024
Distribution - Electric	$	22,695.3	$	21,144.1
Distribution - Natural Gas	9,888.0		8,922.2
Transmission - Electric	17,082.4		16,130.9
Distribution - Water (1)	2,577.3		—
Solar	206.8		201.0
Utility	52,449.8		46,398.2
Other (2)	2,476.3		2,254.1
Property, Plant and Equipment, Gross	54,926.1		48,652.3
Less:  Accumulated Depreciation
Utility	(10,911.7)		(9,636.5)
Other	(1,246.1)		(1,044.1)
Total Accumulated Depreciation	(12,157.8)		(10,680.6)
Property, Plant and Equipment, Net	42,768.3		37,971.7
Construction Work in Progress	3,162.7		3,014.9
Total Property, Plant and Equipment, Net	$	45,931.0	$	40,986.6

	As of December 31,
	2025						2024
(Millions of Dollars)	CL&P		NSTAR Electric		PSNH		CL&P		NSTAR Electric		PSNH
Distribution - Electric	$	8,906.0	$	10,635.7	$	3,193.8	$	8,437.9	$	9,782.3	$	2,964.2
Transmission - Electric	7,222.5		6,722.9		3,138.7		6,937.7		6,375.2		2,819.6
Solar	—		206.8		—		—		201.0		—
Property, Plant and Equipment, Gross	16,128.5		17,565.4		6,332.5		15,375.6		16,358.5		5,783.8
Less:  Accumulated Depreciation	(3,081.3)		(4,014.2)		(1,085.4)		(2,928.0)		(3,782.0)		(1,032.3)
Property, Plant and Equipment, Net	13,047.2		13,551.2		5,247.1		12,447.6		12,576.5		4,751.5
Construction Work in Progress	576.1		1,757.7		260.6		554.6		1,461.3		338.4
Total Property, Plant and Equipment, Net	$	13,623.3	$	15,308.9	$	5,507.7	$	13,002.2	$	14,037.8	$	5,089.9

(1)As of December 31, 2024, the property, plant and equipment balance, net of accumulated depreciation, attributable to the Aquarion water distribution business was classified to Assets Held for Sale on the Eversource balance sheet. As of December 31, 2025, these assets were reclassified as Property, Plant and Equipment, Net on the Eversource balance sheet. For further information, see Note 24, “Assets Held for Sale.

(2)These assets are primarily comprised of computer software, hardware and equipment at Eversource Service and buildings at The Rocky River Realty Company.

The depreciation rates for the various classes of utility property, plant and equipment aggregate to composite rates as follows:

(Percent)	2025		2024		2023
Eversource	3.3	%	3.2	%	3.1	%
CL&P	2.9	%	2.9	%	2.8	%
NSTAR Electric	2.8	%	2.8	%	2.7	%
PSNH	3.0	%	3.0	%	3.0	%

The following table summarizes average remaining useful lives of depreciable assets:

	As of December 31, 2025
(Years)	Eversource	CL&P	NSTAR Electric	PSNH
Distribution - Electric	33.0	34.7	32.5	30.4
Distribution - Natural Gas	32.8	—	—	—
Transmission - Electric	39.2	35.4	44.1	39.6
Distribution - Water	43.9	—	—	—
Solar	21.8	—	21.8	—
Other (1)	9.9	—	—	—

(1)The estimated useful life of computer software, hardware and equipment primarily ranges from 5 to 15 years and of buildings is 40 years.