What the court did
The court held Initiative 2066 unconstitutional under Washington’s single-subject rule because it combined multiple distinct subjects and could not be severed.
Washington Supreme Court
Washington Supreme Court Invalidates Natural-Gas Initiative
Washington’s Supreme Court invalidated Initiative 2066 under the single-subject rule, changing the regulatory baseline for gas, building-code, and heat-pump planning.
Case record
Authority before analysis.
- Court
- Washington Supreme Court
- Docket
- No. 104240-0
- Decision
- September 17, 2026
- Posture
- Published merits opinion affirming the superior court on the single-subject issue.
- Status
- Published, precedential state supreme court decision.
Why operators should care
The decision changes the regulatory baseline for gas access, building-code planning, utilities, HVAC, boilers, and heat-pump projects in Washington.
What remains unresolved
The opinion does not resolve every future gas, building-code, utility, or decarbonization dispute. Further review or rehearing may also be sought.
Primary record
Read the opinion.
This update identifies the court, posture, holding, and unresolved questions. The linked opinion remains the controlling source.
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