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Significant accounting policies - Schedule of Estimated And Weighted Average Useful Lives of Depreciable Assets (Details)	Dec. 31, 2024	Dec. 31, 2023
Utility plant | Minimum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful lives	1 year	1 year
Utility plant | Maximum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful lives	100 years	100 years
Utility plant | Weighted average useful lives
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful lives	41 years	40 years
Hydro: generation facilities and other | Minimum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years	5 years
Hydro: generation facilities and other | Maximum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful lives	60 years	60 years
Hydro: generation facilities and other | Weighted average useful lives
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful lives	35 years	35 years

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Details

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X

- Details

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X

- Details

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Balance Type:
Period Type:

X

- Details

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X

- Details

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Period Type: