Does Arizona have a law requiring carbon-free electricity?

There is no binding statewide mandate. The commission drafted one between about 2018 and 2022 but voted it down in 2022. The older renewable standard, roughly 15 percent by 2025, still applies to the regulated utilities.

Will my APS or SRP power get cleaner anyway?

Likely yes, but on each utility's own schedule rather than a state deadline. APS has a voluntary goal of 100 percent clean power by about 2050, and SRP sets its own targets. Neither is locked in by state rule.

Why did the commission reject its own rules?

The 2022 vote split the commissioners, whose makeup shifts with elections. The reasons given ranged from cost concerns to disagreement over how far the commission's authority reaches. The docket is the place to read their actual positions.

What is the difference between carbon-free and renewable?

Renewable usually means solar, wind, and similar sources. Carbon-free is broader and also counts nuclear, which matters here because the Palo Verde plant west of Phoenix is a large zero-emission source. The rejected rules used the broader term.

Where can I read the rulemaking myself?

The commission's eDocket holds the filings, public comments, and the final vote. Open meeting agendas and records are posted on the commission's main site. Both are public and free to search.

The clean energy rules Arizona wrote, then voted down

Start with your bill

Your electric bill this month came from either APS or SRP, depending on which side of a service boundary you happen to live on, a line that has nothing to do with the energy transition and everything to do with history. If you assumed Arizona already has a law on the books requiring your utility to go carbon-free, it is worth knowing that the state came close to writing one, then voted it down.

Between roughly 2018 and 2022, the Arizona Corporation Commission, the elected five-member body that regulates the investor-owned utilities, worked on a package of energy rules that would have pushed those companies toward 100 percent carbon-free electricity by about midcentury. After years of workshops and redrafts, the commission rejected the final package in 2022.

So the state is left with a patchwork. An older renewable standard still stands, the utilities carry their own voluntary targets, and SRP, which powers much of the East Valley, was never under these rules at all. Here is how that happened and what it means for your meter.

What the commission drafted, then rejected

The rules grew out of the commission's own energy modernization effort, a multi-year docket (the public case file where every filing, comment, and vote is recorded). Draft versions would have set interim clean energy benchmarks and moved the regulated utilities toward 100 percent carbon-free power by about 2050. Carbon-free, not only renewable: the language would have counted nuclear and other zero-emission sources, not just solar and wind.

After several redrafts and rounds of public comment, the package reached a final vote in early 2022, by which point the commission's makeup had shifted through elections. The commissioners declined to adopt it, splitting over cost and over how far the commission's authority should reach. No binding statewide carbon-free mandate took its place.

The standard that is still on the books

What remains is the Renewable Energy Standard and Tariff, usually shortened to REST, which the commission adopted back in 2006. It asks regulated utilities to draw roughly 15 percent of their power from renewable sources by 2025, with a slice set aside for distributed generation like rooftop solar. Measured against the rejected rules, 15 percent is a modest floor.

The honest math on top of that floor is voluntary. APS has said publicly it aims for 100 percent clean electricity by about 2050, with a large share clean by 2030 and an exit from coal within a few years. That is the company's own commitment, not a state requirement, which means a future board or a future commission could revisit it. A promise a utility makes to itself is easier to move than a rule written into the state code.

Who it would have bound, and who it never did

The commission regulates the investor-owned utilities: APS, which serves much of metro Phoenix and long stretches of the state, and Tucson Electric Power to the south. These are the companies the rejected rules would have covered. If your bill says APS, this is your utility's regulator, and its open meetings are where decisions about your rates and power mix are made.

SRP sits outside that structure. Salt River Project is a public power utility run by its own elected board rather than the corporation commission, so the drafted rules would not have applied to it regardless of the vote. SRP serves Tempe, Mesa, and large parts of the East Valley, and it sets its own sustainability goals on its own timeline. Two neighbors on opposite sides of a service line can live under very different rules shaping the same desert grid.

Worth watching this month

1. Watch the commission's open meeting agendas on azcc.gov for any item that reopens the energy rules docket, which has resurfaced from time to time but is routine housekeeping more often than it is real movement.

2. APS files an integrated resource plan (its long-range supply roadmap) with the commission on a multi-year cycle, and the next one is where any genuine change in clean-energy pace would show up first.

3. Keep an eye on SRP board meeting materials for updates to its own carbon targets, since SRP moves independently of the state process and on its own schedule.

4. Track the commission's eDocket for fresh comments in any clean-energy proceeding, a good early signal that something is actually advancing rather than merely scheduled.

5. The REST 15 percent target was due in 2025, so the utilities' compliance filings showing whether they met it should be on the docket around now, though those filings tend to be routine rather than dramatic.