Committee advances bill requiring replacement firm generation before plant retirements

House Bill 25‑27, advanced by the Senate Committee on Natural Resources on a 5‑3 vote, would prohibit the Arizona Corporation Commission from authorizing the retirement of an electric generation facility in a rate case, integrated resource plan or similar filing unless a new, equal‑or‑greater firm power source that is presently available on the grid already exists.

Supporters said the bill is aimed at preserving dispatchable, baseload capacity to prevent outages as overall electricity demand grows. “If there is going to be a shutting down of a base load power plant … you need base load power already in place so that when you shut that down, you’re not going to put the grid at risk,” said James Taylor, president of the Heartland Institute.

Opponents — including renewable industry and clean‑energy advocates — said the bill would unduly favor traditional fossil generation and could discourage replacement projects that pair renewable generation with storage. “This restriction is unnecessary and may in fact harm Arizona’s ability to have safe and reliable power across the state,” said Jane Anderson, Arizona state director for Mormon Women for Ethical Government.

Solar industry representatives and environmental groups urged the committee not to limit utility planning options. Michael Gardner of the Arizona Solar and Industry Association said the bill’s definitions are unclear and could effectively restrict replacement options to gas‑fired generation. Sandy Barr of the Sierra Club’s Grand Canyon chapter warned the measure may be unconstitutional and would raise costs for ratepayers by constraining the Arizona Corporation Commission’s options.

Committee members discussed differing priorities: several members framed the bill as protecting consumers and grid reliability in the face of rising demand (testimony cited projections of significantly increased electricity use), while others argued the authority to decide resource portfolios should remain with regulators and utilities and should not be legislatively constrained. Some senators said their votes reflected local experience with planned plant retirements and the pace of replacement planning.

The committee approved the measure on a vote of 5 ayes and 3 nays and sent the bill forward with a due‑pass recommendation.

Votes at the committee level do not finalize policy; if the bill advances it will return to other committees and then to the floor for additional debate and a final legislative vote.

Why it matters: The bill attempts to address how Arizona manages the retirement of dispatchable power amid rapid changes in both demand and the makeup of the generation fleet. Proponents say it preserves reliability; opponents say it risks locking the state into more expensive or higher‑emitting generation and constraining deployment of renewables with storage.

What’s next: The bill moves to subsequent legislative steps where additional stakeholders and utilities will have opportunity to testify and where sponsors may revise definitions and applicability.