Area of Service Territory

No definition available.

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- Definition

Jointly Owned Non-Utility Plant Share

+ References

No definition available.

+ Details

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- Definition

Variable Interest Entity, Measure of Activity, Contracted Capacity

+ References

No definition available.

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- Definition

Variable Interest Entity, Payable

+ References

No definition available.

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- Definition

Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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- Definition

Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense.

+ References

No definition available.

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- 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.

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- Definition

The amount of expense between the reporting entity and the Variable Interest Entity (VIE).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 810
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
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-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481203/810-10-50-3

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 25
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481231/810-10-45-25

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- Details

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- Details

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- Details

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Summary of Consolidation and Significant Accounting Policy - Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2026 USD ($) mi² MW	Jun. 30, 2025 USD ($) MW	Dec. 31, 2025 USD ($)
Summary of Consolidation Policy
Area of Service Territory (in sqmi) \| mi²	6,000
Subsidiaries
Summary of Consolidation Policy
Area of Service Territory (in sqmi) \| mi²	6,000
Variable Interest Entity, Measure of Activity, Expense	$ 51.7	$ 45.7
Variable Interest Entity [Line Items]
Variable Interest Entity, Measure of Activity, Expense	$ 51.7	$ 45.7
Variable Interest Entity, Measure of Activity, capacity \| MW	813.8	723.8
Variable Interest Entity, Payable	$ 13.2		$ 14.5
Subsidiaries \| Natural Gas, US Regulated [Member] \| Tacoma LNG
Summary of Consolidation Policy
Construction in Progress, Gross	$ 220.4		223.2
Subsidiaries \| Tacoma LNG
Summary of Consolidation Policy
Jointly Owned Non-Utility Plant Share	43.00%
Puget LNG
Summary of Consolidation Policy
Jointly Owned Non-Utility Plant Share	57.00%
Puget LNG \| Natural Gas \| Tacoma LNG
Summary of Consolidation Policy
Construction in Progress, Gross	$ 226.7		$ 228.9
Operating Costs and Expenses	$ 11.7	$ 12.7