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​The electricity we provide our customers comes from a diverse mix of high-performing and increasingly clean generation.
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coal-fueled power plants
Four Corners
The 2-unit, 1,540-megawatt Four Corners Power Plant, located on the Navajo Indian Reservation west of Farmington, New Mexico, is operated by APS. Fueled by low-sulfur coal from the nearby Navajo mine and cooled by the nearby Morgan Lake, the plant is owned by APS and 4 other utilities in the Southwest. APS' stake in Four Corners makes 970 megawatts of energy available to the APS system.
About 80% of the employees at the plant are Native American.
The 767-megawatt Cholla Power Plant is located in northeastern Arizona near Holbrook. APS operates the plant and owns Units 1 and 3, which are capable of producing 387 megawatts of electricity. PacifiCorp (PAC) owns the 380-megawatt Unit 4 - the largest unit at the plant. The two utilities participate in a seasonal power exchange in which PAC customers in the Pacific Northwest receive electricity from the APS system in the winter when their electricity demands are high and APS receives PAC power in the summer, during APS' peak demand.
Cholla is fueled by coal from the McKinley Mine in New Mexico. 
The Navajo Power Plant is located in northern Arizona on the Navajo Indian Reservation near Page, and features three 750-megawatt coal-fueled, steam-electric generating units. An electric railroad delivers coal to the plant from a mine on the Navajo and Hopi Indian Reservations at Black Mesa in northern Arizona. 
The plant is operated by Salt River Project, and is owned by a partnership of 5 utility companies and the U. S. Bureau of Reclamation. APS owns 14% of the plant.
natural gas operated plants
We own or operate 7 natural-gas-fueled plants in Arizona.
Redhawk is our largest combined-cycle power plant. It includes 2 identical 530-MW natural gas-fueled combined-cycle units. Located near the Palo Verde Generating Station west of Phoenix, Redhawk uses treated effluent purchased from Palo Verde to meet its cooling needs. Redhawk is a zero liquid discharge site; the cooling water is continually reclaimed and reused. No water is released to the environment.
We own and operate Redhawk, which opened in mid-2002.
west phoenix
The natural gas-fueled power plant has 7 generating units – 2 combustion turbine units and 5 units – that employ combined-cycle technology. Located in southwest Phoenix, West Phoenix generates about 1,000 MW of electricity.
We own and operate West Phoenix. ​
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The natural gas-fueled power plant has 2 steam and 2 combustion turbine units capable of generating about 340 MW. The Ocotillo Solar PV Plant is located on the grounds, as well as the offices for the APS Solar Operations and Maintenance group, which operates the APS Solar Fleet. Located in Tempe, AZ, Ocotillo also is the location for the Tempe/APS Joint Fire Training Center.
We own and operate Ocotillo.
The 450-MW Sundance Generating Station in Coolidge, AZ, is the newest member of our fleet. The simple-cycle, natural gas-fueled station consists of 10 quick-start combustion turbines. We purchased the 450-MW station in Spring 2005.
The natural gas-fueled power plant has 3 combustion turbine units with a combined capacity of about 189 MW. We own and operate all 3 generating units, located north of Tucson, AZ.
We operate the natural gas-fueled power plant near Yuma in southwestern Arizona, and own 6 combustion turbine units that produce nearly 243 MW for our customers. The plant also includes a 75 MW steam turbine, and a 20 MW combustion turbine. Imperial Irrigation District owns those 2 turbines and we operate them.
The Douglas Power Plant, located in Douglas in southeastern Arizona, has 1 16-MW combustion turbine peaking unit and is put into service only when demand for electricity is high in the Douglas area. The plant has no full-time employees but is operated and serviced by employees from the Saguaro plant, near Tucson.​

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palo verde generating station
Palo Verde Generating Station has been the nation’s largest power producer of any kind for more than 25 years – all of it clean and carbon-free. As the heart of the APS generation fleet, it provides the foundation for the reliable service our customers know they can count on.
The plant is a critical asset to the Southwest, generating more than 32 million megawatt-hours annually – enough power for more than 4 million people. ​

clean air & environment​​​​
  • Palo Verde is the nation’s largest source of clean-air energy.
  • The plant is the largest carbon-free contributor to Arizona's clean-air energy.
  • As the nation’s only nuclear plant not located on a body of water, every year, Palo Verde recycles more than 20 billion gallons of wastewater from surrounding municipalities to cool the plant.
innovation & technology​​​
  • FLEX equipment that can work at plants around the nation provides an additional layer of safety in the event of a natural or other disaster.
  • The use of robotics to inspect equipment and to diagnose and repair problems boosts employee safety, and saves time and money – which translates into customer savings.
  • Other equipment is inspected using unmanned aerial systems (drones), providing enhanced safety and efficiency.
  • Palo Verde operators are participating in a pilot program with Idaho National Labs to develop the “control room of the future,” exploring the use of modern technologies, such as touch screens, to maximize efficiencies and precisely control today’s nuclear plants and those in the future.​
​​​economic impact
  • Palo Verde provides an annual economic impact of more than $2 billion through taxes, salaries, material and service purchases, and more.
  • Palo Verde is the largest single commercial taxpayer in Arizona.
  • The plant has about 2,600 full-time employees. An additional 800+ contractors are employed twice yearly during month-long planned refueling and maintenance outages.
  • Palo Verde purchases $117 million in products and services from more than 1,200 Arizona businesses every year.​
community involvement​​​
  • Palo Verde employees donate approximately $1 million each year to local charities.
  • In partnership with Estrella Mountain Community College and a local technical education high school district, Palo Verde helped establish West-MEC Southwest, a first-of-its-kind campus that provides training and education for a new generation of utility workers – nuclear plant workers in particular.​
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interactive renewable energy map
Our interactive map lets you explore our expanding portfolio of renewable energy generation facilities.