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SEGMENTED REPORTING
 12 Months Ended
Dec. 31, 2025
Segment Reporting [Abstract]  
SEGMENTED REPORTING SEGMENTED REPORTING
The Company has three reportable segments: Transmission, Distribution, and Other. The composition of these segments is described in Note 1 to the consolidated financial statements.
The designation of segments has been based on a combination of regulatory status and the nature of the services provided. Operating segments of the Company are determined based on information used by the Chief Operating Decision Maker (CODM) in deciding how to allocate resources and evaluate the performance of each of the segments. Hydro One’s CODM consists of its Chief Executive Officer and certain members of the executive leadership team. The CODM evaluates segment performance based on income before financing charges, equity income, and income tax expense from continuing operations (excluding certain allocated corporate governance costs) (EBIT). The CODM considers the key components of EBIT to understand the variances to prior period on a quarterly basis and measures them against the Company’s budget and forecast across each of the three segments on a monthly basis in order to properly allocate resources between and within the operating segments.
Year ended December 31, 2025 (millions of dollars)
TransmissionDistributionOtherConsolidated
Revenues2,429 6,557 55 9,041 
Purchased power— 4,486 — 4,486 
Operation, maintenance and administration447 661 98 1,206 
Depreciation, amortization and asset removal costs570 529 12 1,111 
Income (loss) before financing charges, equity income and income tax expense1,412 881 (55)2,238 
Capital investments2,097 1,252 17 3,366 
Year ended December 31, 2024 (millions of dollars)
TransmissionDistributionOtherConsolidated
Revenues2,269 6,175 40 8,484 
Purchased power— 4,143 — 4,143 
Operation, maintenance and administration475 721 112 1,308 
Depreciation, amortization and asset removal costs554 502 10 1,066 
Income (loss) before financing charges, equity income and income tax expense1,240 809 (82)1,967 
Capital investments1,860 1,185 18 3,063 
Total Assets by Segment:
As at December 31 (millions of dollars)
20252024
Transmission23,630 21,630 
Distribution15,160 14,040 
Other881 1,012 
Total assets39,671 36,682 
Total Goodwill by Segment:
As at December 31 (millions of dollars)
20252024
Transmission157 157 
Distribution216 216 
Other5 — 
Total goodwill378 373 
All revenues, assets and substantially all costs, as the case may be, are earned, held or incurred in Canada.