Commitments Disclosure [Line Items]

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Number of Lawsuits

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Number of Lawsuits Filed by Groups of Individual Plaintiffs

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Number of Lawsuits Filed by Insurance Companies

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- Definition

Wind Power Capacity

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- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

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Amount of contractual obligation to be paid after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of contractual obligation to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of contractual obligation to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of contractual obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of contractual obligation to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of contractual obligation to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Commitments and contingencies - Estimates of Future Commitments (Detail) $ in Thousands	Aug. 06, 2021 MWac	Mar. 03, 2022 lawsuit	Dec. 31, 2021 USD ($)
Commitments Disclosure [Line Items]
Year 1			$ 327,438
Year 2			181,692
Year 3			154,481
Year 4			146,458
Year 5			102,903
Thereafter			1,150,942
Total			2,063,914
Power purchase
Commitments Disclosure [Line Items]
Year 1			62,759
Year 2			33,521
Year 3			33,585
Year 4			33,821
Year 5			12,274
Thereafter			155,106
Total			331,066
Gas supply and service agreements
Commitments Disclosure [Line Items]
Year 1			101,406
Year 2			75,482
Year 3			49,328
Year 4			44,286
Year 5			26,887
Thereafter			176,535
Total			473,924
Service agreements
Commitments Disclosure [Line Items]
Year 1			65,230
Year 2			59,641
Year 3			58,356
Year 4			54,953
Year 5			50,181
Thereafter			347,546
Total			635,907
Capital projects
Commitments Disclosure [Line Items]
Year 1			85,130
Year 2			0
Year 3			0
Year 4			0
Year 5			0
Thereafter			0
Total			85,130
Land easements
Commitments Disclosure [Line Items]
Year 1			12,913
Year 2			13,048
Year 3			13,212
Year 4			13,398
Year 5			13,561
Thereafter			471,755
Total			$ 537,887
Gaia Power Inc. vs APUC \| Amherst Island Wind Facility
Commitments Disclosure [Line Items]
Wind power capacity (megawatt AC) \| MWac	74
Gaia Power Inc. vs APUC \| Blue Hill Wind Project
Commitments Disclosure [Line Items]
Wind power capacity (megawatt AC) \| MWac	175
Mountain View Fire \| Subsequent Event
Commitments Disclosure [Line Items]
Number of active lawsuits \| lawsuit		8
Number of lawsuits filed by groups of individual plaintiffs \| lawsuit		4
Number of lawsuits filed by insurance companies \| lawsuit		3