Horse Mesa

20909 E. Apache Trail, Apache Junction, AZ 85119

Plant Summary Information

Horse Mesa is ranked #5 out of 8 hydroelectric power plants in Arizona in terms of total annual net electricity generation.

Horse Mesa is comprised of 4 generators and generated -2.4 GWh during the 3-month period between November 2025 to February 2026.

Plant Name	Horse Mesa
Utility Name	Salt River Project
Location	Maricopa County, AZ
Initial Operation Date	April 1927
Last Update	Feb 2026
Annual Generation	77.7 GWh
Annual Consumption	84.1 k MMBtu
Ranked #3,729 out of 12,637 Power Plants Nationwide
Ranked #403 out of 1,331 Water Power Plants Nationwide
Ranked #80 out of 170 Arizona Power Plants
Ranked #5 out of 8 Arizona Water Power Plants
Fuel Types	Water

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Summary Information
Plant Name	Horse Mesa (145)
Plant Address	20909 E. Apache Trail, Apache Junction, AZ 85119
Utility	Salt River Project (16572)
Latitude, Longitude	33.5907, -111.344
Generation Dates on File	Jan 2001 to Feb 2026
Initial Operation Date	April 1927
Annual Generation	77.7 GWh
Fuel Types	Water

Federal Energy Regulatory Commission (FERC) Information
FERC Cogeneration Status	No
FERC Small Power Producer Status	No
FERC Exempt Wholesale Generator Status	No

Regulatory Information
Regulatory Status	Regulated
NERC Region	WECC
Balancing Authority	Salt River Project (SRP)
NAICS Code	Utilities (22)
Sector	Electric Utility (1)
Water Source	Salt River
Ash Impoundment	No
Transmission / Distribution Owner	Salt River Project (16572) AZ
Grid Voltage	115.00 kV
Energy Storage	Yes

* Data obtained from the 2024 EIA 860 Report

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Single Owner
Nameplate Capacity	9.9 MW
Nameplate Power Factor	0.9
Summer Capacity	10 MW
Winter Capacity	10 MW
Minimum Load	3 MW
Uprate/Derate Completed	No

Status	Operating
First Operation Date	April 1927
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Water
Solid Fuel Gasification	No
Carbon Capture Technology	No
Time From Cold Shutdown To Full Load	10M
Multiple Fuels	No

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Single Owner
Nameplate Capacity	9.9 MW
Nameplate Power Factor	0.9
Summer Capacity	10 MW
Winter Capacity	10 MW
Minimum Load	3 MW
Uprate/Derate Completed	No

Status	Operating
First Operation Date	April 1927
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Water
Solid Fuel Gasification	No
Carbon Capture Technology	No
Time From Cold Shutdown To Full Load	10M
Multiple Fuels	No

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Single Owner
Nameplate Capacity	11.7 MW
Nameplate Power Factor	0.9
Summer Capacity	11.7 MW
Winter Capacity	11.7 MW
Minimum Load	3 MW
Uprate/Derate Completed	No
Status	Operating
First Operation Date	April 1927
Combined Heat & Power	No

Sector Name	Electric Utility (1)
Energy Source	Water
Solid Fuel Gasification	No
Carbon Capture Technology	No
Time From Cold Shutdown To Full Load	10M
Planned Net Summer Capacity Uprate	0.7 MW
Planned Net Winter Capacity Uprate	0.7 MW
Planned Uprate	April 2025
Other Planned Modifications	Yes
Other Modifications	April 2025
Multiple Fuels	No

Technology	Hydroelectric Pumped Storage
Prime Mover	Pumped Storage
Ownership	Single Owner
Nameplate Capacity	99.8 MW
Nameplate Power Factor	0.9
Summer Capacity	119 MW
Winter Capacity	119 MW
Minimum Load	80 MW
Uprate/Derate Completed	No

Status	Operating
First Operation Date	June 1927
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Water
Solid Fuel Gasification	No
Carbon Capture Technology	No
Time From Cold Shutdown To Full Load	10M
Multiple Fuels	No

Owner Name	Address	Generator	Ownership
*We couldn't locate any owners for this plant*

Power plants with a similar annual net generation from Water.

Rank	Plant Name	Plant Location	Annual Generation
#393	Grahamsville	Grahamsville, NY	82.3 GWh
#394	Blanchard	Royalton, MN	81.8 GWh
#395	Muck Valley Hydroelectric	NA, CA	81.8 GWh
#396	El Dorado	Pollock Pines, CA	80.9 GWh
#397	Narrows PH	Grass Valley, CA	80.8 GWh
#398	South Glens Falls Hydroelectric	South Glens Falls, NY	80.4 GWh
#399	Grandfather Falls	Irma, WI	80.4 GWh
#400	Williams Hydro	Solon, ME	80.2 GWh
#401	Upper Mechanicville	Town of Stillwater, NY	78.7 GWh
#402	Drop 4	Holtville, CA	78.2 GWh
#404	West Enfield Hydro	West Enfield, ME	77.5 GWh
#405	Amoskeag	Manchester, NH	76.9 GWh
#406	Union Valley	Fresh Pond, CA	76.5 GWh
#407	Iron Gate	Hornbrook, CA	76.4 GWh
#408	Bennetts Bridge	Altmar, NY	76.3 GWh
#409	Madison Dam	Ennis, MT	76.2 GWh
#410	Swan Lake	Ketchikan, AK	75.5 GWh
#411	Blue Lake Hydro	Sitka, AK	75.4 GWh
#412	E J West	Lake Luzerne, NY	75.4 GWh
#413	Stevens Creek	Martinez, GA	74.5 GWh

Below are closest 20 power plants surrounding Horse Mesa.

Plant Name	Plant Location	Annual Generation	Distance
Arizona State University CHP	Tempe, AZ	40.2 GWh	35.7 mi
AZ State University - Tempe Campus Solar	Tempe, AZ	1.1 GWh	35.6 mi
Banner Solar Ironwood	Queen Creek, AZ	3.8 GWh	29.1 mi
Bonnybrooke PV	Florence, AZ	121.2 GWh	37.2 mi
Box Canyon (AZ)	Florence, AZ	609.7 GWh	29.8 mi
Copper Crossing Energy and Research Cent	Florence, AZ	5.1 GWh	31.2 mi
Gilbert Solar Facility I, LLC	Gilbert, AZ	3.8 GWh	31 mi
Jewish Community Center PV	Scottsdale, AZ	1.8 GWh	33.4 mi
Kyrene	Tempe, AZ	999.6 GWh	37.8 mi
Mesa Carport PV	Mesa, AZ	7.5 GWh	22.5 mi
Mormon Flat	Apache Junction, AZ	41.5 GWh	6.3 mi
Ocotillo	Tempe, AZ	405.1 GWh	34.7 mi
Paradise Valley H.S. PV	Phoenix, AZ	2.1 GWh	37.9 mi
Phoenix Airport East Economy Lot	Phoenix, AZ	1.3 GWh	38.4 mi
Poseidon Solar, LLC	Globe, AZ	50.2 GWh	30.8 mi
Queen Creek Solar Farm	Queen Creek, AZ	40.7 GWh	27.2 mi
Roosevelt	Roosevelt, AZ	101.8 GWh	11.9 mi
Sandstone Solar	Florence, AZ	117.2 GWh	38.7 mi
Santan	Gilbert, AZ	4.9 TWh	29.4 mi
Stewart Mountain	Phoenix, AZ	45.7 GWh	11.2 mi