Arizona S.B. 1418, vetoed: corporation commission and small modular reactors

Arizona S.B. 1418 was vetoed on 19 June 2026. The Senate fact sheet describes a certificate exemption for a co-located small modular reactor and a definition whose printed nameplate phrase is not more 300 megawatts. The veto means that text is not law.

Category: Bills, proposed rules and consultations
Status: Failed
Instrument: bill · S.B. 1418, 57th Legislature, 2nd Regular Session (vetoed)
Issued by: Arizona State Senate
Jurisdiction: Arizona
Affects: Siting
Effective date: Not recorded
Expiry or completion: None recorded
Operative text: Arizona Senate fact sheet for S.B. 1418, marked vetoed (Vetoed amended fact sheet opened 4 October 2026)
Last checked · next review: 2026-10-04 · 2027-04-15

Legal and geographic scope

Senate fact sheet for an amended bill the governor vetoed. The sheet says the bill would have let a utility, after 30 days' written notice to the Arizona Corporation Commission, construct a small modular reactor co-located with an extra-high-load-factor customer without applying for a certificate of environmental compatibility. It also describes a change to the plant definition and a definition of small modular reactor. The veto means those changes are not law.

Not approved or still pending

The enrolled bill and the veto letter were not opened. Current A.R.S. sections 40-360 and 40-360.03 were opened: a plant includes a nuclear unit of 100 megawatts or more, with a pre-13 August 1971 commitment exception, and a utility must apply for a certificate before construction. Those pages print no enactment date, so they are not a separate record. This veto does not decide any project.

Dated lifecycle

19 Jun 2026 · actual · day · Failed — The fact sheet prints Vetoed by the Governor 6/19/26. Senate Research prepared the sheet on 25 June 2026. The governor's 19 June 2026 action page lists SB 1418 under Vetoed. (Arizona Senate fact sheet for S.B. 1418, marked vetoed)

Definitions in this instrument

Small modular reactor (S.B. 1418 fact sheet item 8): The fact sheet says the bill defines a small modular reactor as a generation III+ or generation IV nuclear generating unit with a nameplate rating of not more 300 megawatts. That phrasing is the fact sheet's. The enrolled bill was not opened, and the veto means this definition is not law.
Legal definition used by this instrument only; SMRMap's inclusion rule for SMRs is separate and unchanged.

Projects or designs named by the source

None. Location in this jurisdiction does not make a project eligible for, or approved under, this measure.

Sources

Arizona Senate fact sheet for S.B. 1418, marked vetoed (government_primary, accessed 2026-10-04)
Governor Katie Hobbs legislative action update, 19 June 2026 (government_primary, accessed 2026-10-04)