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SEGMENT INFORMATION (Tables)
 3 Months Ended
Mar. 31, 2025
Segment Reporting [Abstract]  
Summary of Segment Information and Segmented Total Assets Eversource's segment information is as follows:
For the Three Months Ended March 31, 2025
Eversource
(Millions of Dollars)
Electric DistributionNatural Gas DistributionElectric TransmissionWater DistributionOtherEliminationsTotal
Operating Revenues$2,777.7 $1,141.4 $547.8 $50.3 $439.0 $(837.8)$4,118.4 
Depreciation and Amortization(564.7)(104.5)(106.8)(11.2)(50.6)2.8 (835.0)
Operations and Maintenance (1)
   Operations, Excluding Storm Costs(101.7)(46.2)(31.5)
   Corporate Shared Services(116.4)(30.3)(21.8)
   Storm Costs(19.9)— — 
   Employee Benefits(48.6)(18.6)(11.7)
   Uncollectible Expense(43.7)(30.0)— 
   Other(27.4)2.1 (10.9)
Total Operations and Maintenance(357.7)(123.0)(75.9)(22.8)(349.1)441.0 (487.5)
Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency (2)
(1,580.6)(605.2)(69.6)(6.8)(1.4)394.1 (1,869.5)
Operating Income274.7 308.7 295.5 9.5 37.9 0.1 926.4 
Interest Expense(91.1)(28.4)(38.6)(7.7)(178.4)43.4 (300.8)
Interest Income27.3 6.7 — — 43.4 (43.4)34.0 
Other Income, Net35.3 5.5 12.1 0.8 625.7 (621.1)58.3 
Income Tax (Expense)/Benefit(56.6)(74.1)(68.9)1.0 33.4 — (165.2)
Net Income189.6 218.4 200.1 3.6 562.0 (621.0)552.7 
Net Income Attributable to Noncontrolling Interests(1.2)— (0.7)— — — (1.9)
Net Income Attributable to Common Shareholders$188.4 $218.4 $199.4 $3.6 $562.0 $(621.0)$550.8 
Cash Flows Used for Investments in Plant$489.6 $193.9 $244.8 $28.5 $50.6 $— $1,007.4 
For the Three Months Ended March 31, 2024
Eversource
(Millions of Dollars)
Electric
Distribution		Natural Gas
Distribution		Electric
Transmission		Water DistributionOtherEliminationsTotal
Operating Revenues$2,261.7 $906.0 $507.8 $50.1 $443.6 $(836.6)$3,332.6 
Depreciation and Amortization(109.8)(83.0)(101.0)(0.6)(45.7)2.5 (337.6)
Operations and Maintenance (1)
   Operations, Excluding Storm Costs(111.7)(42.6)(33.0)
   Corporate Shared Services(112.5)(27.0)(19.5)
   Storm Costs(26.4)— — 
   Employee Benefits(44.9)(17.3)(12.2)
   Uncollectible Expense(35.4)(16.1)— 
   Other(17.2)(3.1)(15.7)
Total Operations and Maintenance(348.1)(106.1)(80.4)(25.5)(348.6)445.7 (463.0)
Purchased Power, Purchased Natural Gas and Transmission, Other Taxes and Energy Efficiency (2)
(1,557.0)(448.5)(61.5)(6.5)(0.9)388.4 (1,686.0)
Operating Income246.8 268.4 264.9 17.5 48.4 — 846.0 
Interest Expense(82.5)(24.5)(40.9)(11.4)(146.1)54.7 (250.7)
Interest Income24.5 5.4 0.1 — 54.7 (54.7)30.0 
Other Income, Net32.1 4.7 14.0 1.7 567.9 (559.4)61.0 
Income Tax (Expense)/Benefit(51.6)(63.4)(60.7)(2.4)15.5 — (162.6)
Net Income169.3 190.6 177.4 5.4 540.4 (559.4)523.7 
Net Income Attributable to Noncontrolling Interests(1.2)— (0.7)— — — (1.9)
Net Income Attributable to Common Shareholders$168.1 $190.6 $176.7 $5.4 $540.4 $(559.4)$521.8 
Cash Flows Used for Investments in Plant$471.3 $244.8 $358.4 $31.9 $43.0 $— $1,149.4 

(1)    The significant expense categories and amounts align with the segment-level information that is regularly provided to the chief operating decision maker. Costs of the operations organization include labor and overtime, outside services, vehicles, vegetation management, employee expenses, fees and payments, regulatory assessments, and materials, partially offset by reimbursements. Corporate shared services include corporate centralized functions. Costs within these corporate functions primarily include labor, services by vendors, fees and payments, insurance, and regulatory assessments. Other includes information technology system depreciation at Eversource Service charged to the operating businesses, as well as storm funding, capitalization and various other corporate costs. The segment-level operating expense for information technology system depreciation is eliminated and reflected in depreciation in Eversource’s consolidation.
For the water distribution segment, the chief operating decision maker is provided with total operations and maintenance expense information to manage its operations. Operations and maintenance expenses primarily include employee costs, benefits, and outside services.

(2)    Other segment line items for the electric distribution, electric transmission and natural gas distribution segments primarily include purchased power, purchased natural gas and transmission, taxes other than income taxes including property, payroll-related and Connecticut gross earnings taxes, and energy efficiency program expenses. Other segment line items for the water distribution business primarily include taxes other than income taxes.

The following table summarizes Eversource's segmented total assets:
Eversource
(Millions of Dollars)
Electric
Distribution		Natural Gas
Distribution		Electric
Transmission		Water DistributionOtherEliminationsTotal
As of March 31, 2025$32,280.6 $9,955.8 $16,205.6 $2,528.2 $28,824.6 $(29,600.1)$60,194.7 
As of December 31, 202432,031.9 9,786.7 16,070.9 2,515.8 29,041.1 (29,851.9)59,594.5