Tucson Electric Power customers could be paying more for electricity as soon as next month, with Arizona utility regulators set to vote Tuesday on whether to approve a rate increase that TEP says is needed to cover grid upgrades and inflation. The utility is asking for a 9.8% hike that would add about $13.50 to the average residential customer's monthly bill. If the Arizona Corporation Commission signs off, the new rates would take effect Dec. 1.
According to AZPM, the commission's administrative law judge, Julia Matter, has already weighed in with her own recommendation, backing a smaller rate increase than TEP's latest ask. TEP spokesman JD Wallace said Matter's recommendation translates to an overall bill increase of about 9.4%, with the average household using 805 kilowatt-hours a month seeing bills rise by $12.93, to $150.52, as reported by AZPM. TEP has since filed an amendment seeking the slightly higher 9.8% figure instead, according to Tucson.com.
Not every outlet is describing Matter's recommendation the same way. AZ Luminaria reported that the judge's recommended rate structure would raise average residential bills by 11.2%, a notably higher figure than the 9.4% AZPM and Tucson.com attributed to TEP's own characterization of Matter's order. The discrepancy between those reported impacts has not been reconciled in public reporting so far.
Who's Fighting The Increase
The rate case has drawn pushback from a wide range of interests. The city of Tucson, Pima County, the Department of Defense, Walmart and Kroger have all intervened against the proposed hike, per Tucson.com's reporting. TEP maintains the increase is necessary to make up for expensive investments in the grid and to offset the effects of inflation, the same report notes.
The case has been winding through regulatory review for more than a year. TEP originally requested a 14% rate increase when the case was first filed in May 2025, according to Tucson.com, though AZ Luminaria's account put that initial 2025 request at 13%. The utility later lowered its ask to a little more than 12.5% before requesting an 11.2% bill increase in July, per AZPM's reporting, and has since settled on the 9.8% figure now before regulators.
A Contested Mechanism For Future Rate Changes
Beyond the headline percentage, the case also involves a structural change to how TEP rates could be adjusted going forward. Matter is supporting the utility's request for an Annual Rate Adjustment Mechanism, or ARAM, which would update rates every year, AZPM reports. The Residential Utility Consumer Office, known as RUCO, is challenging those recommendations, according to comments it filed in the case.
Other parties have floated very different numbers for what a fair increase should look like. The Arizona Attorney General's office recommended a far smaller 4% rate hike as an alternative, according to AZ Luminaria. RUCO, for its part, recommended a return on equity of 9.2%, or 9.0% if the ARAM is authorized — a separate financial metric from the overall bill-increase percentages, per AZPM's reporting.
How To Watch Or Weigh In
The Arizona Corporation Commission will vote on TEP's request at its meeting in Phoenix, which begins at 9 a.m. on Nov. 17. Commissioners may approve or reject the judge's recommendation outright. The meeting can be attended in person at 1200 W. Washington St., Hearing Room One, in Phoenix, by telephone at 1-877-309-3457 using passcode 801972877##, or via Webex video or internet conferencing, and it will also be livestreamed at azcc.gov/live.
Telephone meeting lines open up to 30 minutes before the open meeting begins. Anyone who wants to speak during the meeting must complete a request process through the ACC's e-filing website, and public comment is limited to three minutes per speaker. ACC Consumer Services can help with registration questions at 602-542-4251, and anyone needing an ADA accommodation must request it at least 48 hours before the meeting.
For context on what's at stake, the average summer household in TEP's service area uses 1,045 kilowatt-hours a month, with an average summer monthly bill of $190.76. Whether that bill climbs further next summer now rests with the five-member commission.
