In a discussion with Utility Dive, Lea Márquez Peterson, the longest-tenured commissioner on the Arizona Corporation Commission, outlined the escalating pressures facing state regulators over massive power demands, consumer affordability, and regional energy markets.
Growth across Arizona brings a wave of heavy power requests, stretching far beyond traditional data centers to include semiconductor manufacturing facilities. Márquez Peterson noted that public scrutiny centers intensely on water consumption whenever a major industrial project files for development.
Developers face immediate demands regarding their water footprint upon arrival in the state. Public sensitivity remains high due to rapid development and historical transparency issues surrounding past projects.
Public pushback against climbing utility bills became a central issue during the recent election cycle. Márquez Peterson emphasized that consumers demand concrete proof that incoming industrial growth actually pays for itself.
The commission continues to evaluate cost structures, large-load tariffs, and individual energy supply agreements. While utilities grow increasingly sophisticated in negotiating these contracts, statewide standardization remains off the table for now, with specific rules developing through upcoming rate cases.
“We have been talking for years that growth must pay for growth, and I think customers are asking for proof,” Márquez Peterson told Utility Dive.
Márquez Peterson maintained her skeptical stance regarding formula rates for utilities. Although the commission adopted a policy statement in Arizona supporting the concept, she insisted on evaluating each case on its merits to protect customer interests.
Upcoming rate cases involving Tucson Electric Power and Arizona Public Service will test how these formula mechanisms apply in practice. Commissioners must decide whether these structures genuinely benefit ratepayers or primarily serve utility interests.
Arizona utilities have opted to join the Southwest Power Pool’s Markets+, prompting regulatory inquiries into regional market decisions. Márquez Peterson asked utilities to provide updated information detailing the cost-benefit analyses behind their market exits and selections.
“There’s no reason there can’t be transparency,” Márquez Peterson said, emphasizing her desire to ensure any chosen market serves the best interests of ratepayers regarding reliability, transmission availability, and resource planning.
A follow-up workshop is scheduled for Feb. 3 to examine the components of these market decisions with stakeholders.
Maintaining grid reliability during extreme summer heat drives support for an all-of-the-above resource strategy. Nuclear power already supplies roughly 30% of the state through the Palo Verde nuclear generating station.
Expanding nuclear capacity offers reliable carbon-free generation, but high capital costs raise difficult questions about who bears the financial burden. As the commission looks ahead, commissioners must also review the analytical depth and stakeholder participation surrounding upcoming annual true-ups and formula rate decisions.
