Pinnacle West, the Phoenix-based parent of Arizona Public Service, reported $616.5 million in net income for full-year 2025, or $5.05 per diluted share, in results released Wednesday, Feb. 25, 2026. The company said the gains were powered by strong customer growth and a brutally hot summer that pushed electricity demand to new records. Executives also warned that the spending required to keep up with that growth and maintain reliability will make regulatory decisions this spring especially critical for what shows up on local power bills.
In a press release via Business Wire, Pinnacle West said consolidated net income for the quarter ended Dec. 31, 2025, was $15.4 million, or $0.13 per diluted share, compared with a net loss of $6.8 million in the same quarter a year earlier. The company also told investors it expects 2026 weather-normalized earnings of $4.55 to $4.75 per diluted share as it continues to spend heavily to meet rising demand.
How Heat And Growth Shaped 2025
According to Pinnacle West, Arizona Public Service customers set three all-time peak demand records in 2025, with weather-normalized retail electricity sales up about 5.0% and customer counts rising roughly 2.4%. The utility said it expanded assistance programs, connecting Arizonans to about $70 million in annual support and contributing more than $6 million in statewide heat-relief since 2021, according to the company website. “Our diverse generation fleet delivered high-level performance,” Pinnacle West chairman, president and CEO Ted Geisler said in the release.
Regulatory Test This Spring
Behind the upbeat earnings is a high-stakes regulatory question. APS filed a 2025 rate case seeking a roughly $579.5 million net base-rate increase, and Pinnacle West says the hearing is currently scheduled to begin in May 2026, according to the company’s SEC filings. The filing lays out a proposed Formula Rate Adjustment Mechanism (FRAM) intended to reduce regulatory lag and that would eliminate the Lost Fixed Cost Recovery (LFCR) adjustor if it is approved. Pinnacle West says it still earns below its authorized return, making timely recovery of investment a central issue for both the utility and its customers.
Big Loads, Pipelines And New Plants
The surge in demand largely reflects large commercial projects, especially data centers, that have left APS with gigawatts of committed and potential load in its interconnection queue. Utilities have also signed on to a Transwestern pipeline expansion to secure gas supplies, as reported by Utility Dive. Pinnacle West has proposed a Desert Sun power site near Gila Bend that could add up to 2,000 MW and uses a subscription model that has extra-large customers help pay for Phase Two capacity, the company has said. Those plans are meant to keep the lights on for a fast-growing region, but they come with near-term capital costs that regulators will have to scrutinize.
What To Watch
Investors and customers alike will be zeroed in on the May ACC hearing on the 2025 rate case, along with the company’s progress in securing gas, generation and transmission capacity to serve new load. Pinnacle West’s earnings presentation and the replay of management’s Feb. 25 webcast are available online, according to the company’s release via Business Wire, while the regulatory calendar will determine how much of those costs are ultimately passed on to customers and when that hits their bills.
