PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION (Tables)

12 Months Ended

Dec. 31, 2024

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)	2024		2023
Distribution - Electric	$	21,144.1	$	19,656.5
Distribution - Natural Gas	8,922.2		8,155.3
Transmission - Electric	16,130.9		14,666.8
Distribution - Water (1)	—		2,280.1
Solar	201.0		201.1
Utility	46,398.2		44,959.8
Other (2)	2,254.1		2,006.8
Property, Plant and Equipment, Gross	48,652.3		46,966.6
Less: Accumulated Depreciation
Utility	(9,636.5)		(9,670.1)
Other	(1,044.1)		(869.6)
Total Accumulated Depreciation	(10,680.6)		(10,539.7)
Property, Plant and Equipment, Net	37,971.7		36,426.9
Construction Work in Progress	3,014.9		3,071.7
Total Property, Plant and Equipment, Net	$	40,986.6	$	39,498.6


	As of December 31,
	2024						2023
(Millions of Dollars)	CL&P		NSTAR Electric		PSNH		CL&P		NSTAR Electric		PSNH
Distribution - Electric	$	8,437.9	$	9,782.3	$	2,964.2	$	7,897.1	$	9,000.5	$	2,799.2
Transmission - Electric	6,937.7		6,375.2		2,819.6		6,548.2		5,630.8		2,489.5
Solar	—		201.0		—		—		201.1		—
Property, Plant and Equipment, Gross	15,375.6		16,358.5		5,783.8		14,445.3		14,832.4		5,288.7
Less: Accumulated Depreciation	(2,928.0)		(3,782.0)		(1,032.3)		(2,670.5)		(3,585.9)		(984.0)
Property, Plant and Equipment, Net	12,447.6		12,576.5		4,751.5		11,774.8		11,246.5		4,304.7
Construction Work in Progress	554.6		1,461.3		338.4		565.4		1,507.3		270.0
Total Property, Plant and Equipment, Net	$	13,002.2	$	14,037.8	$	5,089.9	$	12,340.2	$	12,753.8	$	4,574.7

(1)As of December 31, 2024, the property, plant and equipment balance, net of accumulated depreciation, attributable to the Aquarion water distribution business has been reclassified to Assets Held for Sale on the Eversource balance sheet. As of December 31, 2023, this balance was recorded within 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)	2024		2023		2022
Eversource	3.2	%	3.1	%	3.0	%
CL&P	2.9	%	2.8	%	2.8	%
NSTAR Electric	2.8	%	2.7	%	2.7	%
PSNH	3.0	%	3.0	%	3.0	%

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


	As of December 31, 2024
(Years)	Eversource	CL&P	NSTAR Electric	PSNH
Distribution - Electric	33.4	34.7	33.4	29.9
Distribution - Natural Gas	34.7	—	—	—
Transmission - Electric	39.7	35.8	45.1	39.8
Distribution - Water	45.2	—	—	—
Solar	22.8	—	22.8	—
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.