Renewable Energy

Renewable resources are clean or "green" energy sources that have a much lower environmental impact than conventional energy sources.

SRP's renewable energy resources include wind, geothermal, hydropower, biomass and solar. Total renewable energy capacity in megawatts (MW) at the close of SRP's 2018 fiscal year, which is May 1, 2017 through April 30, 2018, by resource type is:

  • Biomass: 14 MW
  • Solar, utility-scale 1: 142 MW
  • Wind: 127 MW
  • Geothermal 2: 43 MW
  • Hydropower: 383 MW
  • Solar, rooftop3: 106 MW
  • Total renewable energy capacity: 815 MW4

1Utility-scale solar includes Copper Crossing, Queen Creek, Sandstone, Kayenta and Pinal Central Energy Center.
2Currently, 55 MW of geothermal are being sold to another utility. These are short-term contracts and are not counted toward SRP's Sustainable Portfolio for the duration of the contracts. Also, receiving 18 MW of CalEnergy geothermal energy in 2018. Total of 87 MW is expected by the end of 2020.
3Rooftop solar number reflects SRP incentivized capacity only, which is any residential solar panel units that were installed as a result of a special customer offer. SRP retains the renewable energy credits for these solar installations.
4Capacity values are nameplate, which is the maximum amount of electric energy that a generation source can produce under specific conditions.

Planning for the future

For over one hundred years, SRP has worked to ensure a sustainable future for the communities we serve. In 2004, SRP's Board of Directors approved the Sustainable Portfolio Plan which set a target for meeting retail energy requirements from sustainable sources. We are on track to meet our goal of 20% by 2020, and have an even more ambitious plan that looks ahead to 2035.

That plan, the 2035 Sustainability Goals, was approved by the SRP board in October 2017. The plan goals include: reducing our carbon footprint, ensuring water resiliency, modernizing the energy grid, promoting a sustainable supply chain and reducing waste, and engaging with our communities.

Energy sources

From the sun to biomass, renewable energy resources look to cleaner inexhaustible sources to power modern day life. Learn more about how each renewable energy resource in SRP's portfolio produces green energy.

Solar power

Solar electric plants use the sun, a free and inexhaustible source of fuel, to produce emission-free electricity.

SRP receives 65 MW of solar energy from the Copper Crossing Solar Ranch and Sandstone Solar, both located in Florence, AZ. The combined output from both facilities is 94 million kilowatt-hours (kWh) of solar energy, which is enough energy to meet the needs of about 6,700 SRP customers' homes each year. The Queen Creek solar facility provides 19MW and Kayenta 30 MW of solar energy.

In addition, SRP has a 200 kW solar electric system at the Agua Fria Generating Station in Glendale, as well as two 100 kW solar electric systems at the Rogers Substation in Gilbert. Together, these three plants send close to one million kilowatt-hours (kWh) of power to the grid each year, or enough energy to power 72 homes.


Hydropower is an important part of the history of Salt River Project, and a technology that remains core to our power production portfolio.

The water captured by SRP's dams on the Salt and Verde River systems store tremendous potential energy released through hydroelectric generation stations built into five of SRP's seven dams: Theodore Roosevelt, Horse Mesa, Mormon Flat and Stewart Mountain dams on the Salt River system; and C. C. Cragin Dam on the Verde system.

These generating facilities produce a combined 383 MW of power to serve customers in the Valley.

Low-impact hydropower

SRP's system of canals also plays a part in utilizing the energy stored in water.

The term "low-impact" refers to hydropower that produces clean power using a canal's natural drop in elevation. Because a dam is not needed to create a drop in elevation, no negative environmental impact is made on the site.

SRP installed a low-impact hydroelectric plant on the Arizona Canal at an historic site known as Arizona Falls (located near 56th St. and Indian School).

Wind power

Dry Lake Wind Project in Northern Arizona. SRP diversified its renewable energy portfolio in October 2009 by purchasing 100% of the output from the Dry Lake Wind Power Project, located near Heber, Ariz.

SRP receives 100% of 127 MW generated from the wind farm, or enough to power more than 20,000 homes in the metropolitan Phoenix area.

Geothermal energy

Geothermal power is the better energy source in SRP's renewable energy lineup.

Instead of burning a fuel to heat water into steam as seen in conventional forms of generation, heat from the Earth is used to create the steam that powers the turbines. Geothermal energy is considered renewable energy because no fuel is consumed and the energy is from a naturally occurring source.

The renewable-energy credits are generated by geothermal power plants that produce electricity from naturally occurring geothermal steam. The steam is formed when production wells tap into superheated water reservoirs thousands of feet beneath the Earth's surface.

  • Imperial Valley Geothermal Plants: SRP has signed a 23-year agreement with CalEnergy, LLC to purchase up to 18 MW of geothermal energy a year from a number of plants located in the Imperial Valley of Southern California.
  • Cove Fort Geothermal Project: SRP has signed a 20-year agreement to purchase the entire output of the Cove Fort Geothermal Project, a new 25-MW geothermal power generation project located in Beaver County, Utah.

Biomass energy

Biomass energy is generated from the combustion of fuel, which is typically sourced from wood. SRP has 14 MW of biomass energy in our portfolio through June 2023. The energy is generated from the Novo BioPower Plant located in Snowflake, Ariz. The plant is required to obtain the majority of its fuel from forest thinning, which helps promote healthy forests. Learn more about SRP's forest health initiatives.