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Commitments and contingencies - Estimates of Future Commitments (Details) $ in Thousands	Jun. 30, 2024 USD ($)
Commitments Disclosure [Line Items]
Year 1	$ 254,615
Year 2	179,081
Year 3	136,121
Year 4	131,911
Year 5	124,868
Thereafter	1,167,858
Total	1,994,454
Power purchase
Commitments Disclosure [Line Items]
Year 1	60,458
Year 2	25,890
Year 3	12,434
Year 4	12,680
Year 5	12,894
Thereafter	123,350
Total	247,706
Natural gas supply and service agreements
Commitments Disclosure [Line Items]
Year 1	97,983
Year 2	71,485
Year 3	51,892
Year 4	45,828
Year 5	40,147
Thereafter	198,234
Total	505,569
Service agreements
Commitments Disclosure [Line Items]
Year 1	75,445
Year 2	64,981
Year 3	54,811
Year 4	56,233
Year 5	54,407
Thereafter	248,746
Total	554,623
Capital projects
Commitments Disclosure [Line Items]
Year 1	4,399
Year 2	0
Year 3	0
Year 4	0
Year 5	0
Thereafter	0
Total	4,399
Land easements and other
Commitments Disclosure [Line Items]
Year 1	16,330
Year 2	16,725
Year 3	16,984
Year 4	17,170
Year 5	17,420
Thereafter	597,528
Total	$ 682,157

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

+ Details

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X

- Definition

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).

+ References

No definition available.

+ Details

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- Definition

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).

+ References

No definition available.

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- Definition

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

No definition available.

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- Definition

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).

+ References

No definition available.

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- Definition

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

No definition available.

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- Definition

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).

+ References

No definition available.

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