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Commitments and contingencies - Schedule of Estimates of Future Commitments (Details) $ in Thousands	Dec. 31, 2024 USD ($)
Commitments Disclosure [Line Items]
Year 1	$ 170,671
Year 2	97,433
Year 3	76,663
Year 4	71,281
Year 5	67,828
Thereafter	361,458
Total	845,334
Power purchase
Commitments Disclosure [Line Items]
Year 1	47,201
Year 2	12,311
Year 3	12,557
Year 4	12,805
Year 5	13,022
Thereafter	116,796
Total	214,692
Natural gas supply and service agreements
Commitments Disclosure [Line Items]
Year 1	101,486
Year 2	73,766
Year 3	55,802
Year 4	54,066
Year 5	51,379
Thereafter	166,938
Total	503,437
Service agreements
Commitments Disclosure [Line Items]
Year 1	17,658
Year 2	8,118
Year 3	5,004
Year 4	1,047
Year 5	0
Thereafter	0
Total	31,827
Capital projects
Commitments Disclosure [Line Items]
Year 1	1,100
Year 2	0
Year 3	0
Year 4	0
Year 5	0
Thereafter	0
Total	1,100
Land easements and other
Commitments Disclosure [Line Items]
Year 1	3,226
Year 2	3,238
Year 3	3,300
Year 4	3,363
Year 5	3,427
Thereafter	77,724
Total	$ 94,278

X

- Definition

Commitments Disclosure [Line Items]

+ References

No definition available.

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3

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- Definition

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+ References

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+ References

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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).

+ References

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+ References

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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).

+ References

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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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