Pinnacle West Capital
| Company type | Public |
|---|---|
| Industry | Electric utility |
| Founded | 1985 |
| Headquarters | Phoenix, Arizona , United States |
Key people | Jeffrey B. Guldner (Chairman and CEO) |
| Products | Electric power generation and distribution |
Pinnacle West Capital Corporation is an American utility holding company publicly traded and based in Phoenix, Arizona. It operates Arizona Public Service (APS), which stands as the largest regulated utility within the state under the oversight of the Arizona Corporation Commission (ACC). The company is listed on the New York Stock Exchange and included in the S&P 500 index.
History
The company originated in 1884 as the Phoenix Light and Fuel Company and underwent multiple mergers and rebrandings, ultimately becoming Arizona Public Service in 1952 following its merger with Arizona Edison. During the 1970s, APS predominantly generated its electricity from coal-fired plants, accounting for 94.4% of its power production, supplemented by natural gas and oil sources. From 1920 through 1989, the company maintained a consistent history of paying dividends.
In 1985, Arizona Public Service restructured into a holding company named AZP Group Inc., which was renamed Pinnacle West Capital Corporation in 1987 and began trading under the symbol PNW. Although earnings peaked at over US$255 million in 1983, the early 1990s recession and unsuccessful diversification efforts—including the 1990 seizure of MeraBank, its savings and loan arm—caused significant financial setbacks. By 1990, earnings had fallen below US$100 million, dividend payments were halted, and stock values declined sharply.
By 1992, Pinnacle West had regained profitability with earnings surpassing US$150 million and reinstated dividend distributions by 1993. The company broadened its energy offerings by launching Arizona’s inaugural solar facility in Flagstaff in 1997 and issued long-term debt instruments to finance expansion initiatives.
External factors such as the Enron scandal negatively affected Pinnacle West’s financial results, resulting in losses exceeding $13 million before 2010. Additionally, through its subsidiary Suncor, the company engaged in real estate development until Suncor filed for bankruptcy in 2012.
In September 2011, a major blackout that began at APS’s North Gila Substation caused widespread outages across parts of Arizona, California, and Northern Mexico. Investigations determined that operational mistakes at APS were responsible for the incident. Facing regulatory scrutiny, APS agreed to pay a $3.25 million settlement to NERC and FERC in 2014.
Public criticism arose in 2018 after APS disconnected electricity to a retiree during extreme heat conditions, which contributed to her death. This event prompted regulatory reforms prohibiting power shutoffs during hot summer days within Arizona.
Jeffrey B. Guldner holds the positions of Chairman and CEO, steering Pinnacle West through ongoing industry challenges and strategic growth opportunities.
Service territory
APS provides electrical service to approximately two-thirds of the Phoenix metropolitan region, covering downtown and northern areas of Phoenix as well as the cities of Chandler, Gilbert, Glendale, Peoria, Scottsdale, and Tempe. Beyond the metropolitan area, its service network extends to Flagstaff, Prescott, Yuma, and Douglas.
Power Plants
Through its subsidiary Arizona Public Service, Pinnacle West fully owns and operates several power generation facilities. These plants are responsible for producing the majority of the electricity supplied by Pinnacle West and serve as a key source of power for Arizona.
Coal
Pinnacle West’s coal assets included the Cholla Power Plant, Four Corners Generating Station, and the Navajo Generating Station, which was operated by Salt River Project. Coal was mainly obtained through long-term leases on Navajo Nation territory. The Navajo Generating Station was shut down in 2019, with subsequent site cleanup finalized and land restored by 2024. The Cholla plant ceased operations in March 2025. Currently, Four Corners functions seasonally at half its full capacity outside peak summer periods, thereby reducing Arizona’s reliance on coal-fired electricity.
Nuclear
The company holds ownership and operational responsibilities for part of the Palo Verde Nuclear Generating Station. Since 2003, Pinnacle West has been involved in legal agreements with the Department of Energy regarding nuclear waste storage at Yucca Mountain, securing $36 million through nine settlements as of 2023. The spent fuel storage at Palo Verde is expected to suffice until 2047.
Natural Gas
Pinnacle West controls six plants powered by natural gas or oil. A significant enhancement to the Ocotillo facility in 2019 expanded its generating capacity from 290MW to 690MW, resulting in improved operational efficiency.
Solar
The company owns two large-scale solar installations alongside approximately thirty smaller solar sites. The AZ Sun project attracted an investment of $675 million and has a capacity of up to 180MW. Meanwhile, the Red Rock solar plant generates 44MW, with its output sold as energy credits to institutional purchasers. Pinnacle West is actively growing its portfolio of small-scale solar installations across company properties, government rooftops, and residential initiatives.
In the 2012 Arizona Corporation Commission election cycle, Pinnacle West invested millions in lobbying efforts aimed at scaling back net metering policies. This advocacy continued through 2016 with combined expenditures totaling $6 million alongside pro-solar organizations. By 2017, these actions effectively resulted in a complete suspension of net metering within Arizona.
Planned
Pinnacle West has set a goal to develop 1,200 MW of energy storage capacity, which would constitute nearly all of Arizona’s total storage capability. Additionally, the company intends to boost renewable energy output by 50% above its 2023 baseline by 2025, supporting its growth strategy and strengthening its position in clean energy markets.
See also
- Path 46 (West of Colorado River, Arizona-California West-of-the-River Path)
- Palo Verde Nuclear Generating Station
- Four Corners Generating Station