VIEs - PPAs (Details)	Dec. 31, 2024 MW
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Purchased Power Agreements [Abstract]
Generating capacity (in MW)	3,751

Generating capacity under long-term purchased power agreements.

No definition available.

Name:	xel_GeneratingCapacityUnderLongTermPurchasedPowerAgreements
Namespace Prefix:	xel_
Data Type:	dtr-types1:powerItemType
Balance Type:	na
Period Type:	instant