Directory of Power Plants in the United States
| Plant Name | Utility | Location | Balancing Authority | Annual Generation | Plant Date | Last Update | Fuel Types |
|---|---|---|---|---|---|---|---|
| OYA Main Street | OYA Main Street LLC | York, NY | New York Independent System Operator (NYIS) | 8.3 GWh | Nov 2022 | Dec 2023 | Solar |
| Old Faithful | NorthWestern Energy (MT wind/thermal) | Yellowstone, WY | NorthWestern Corporation (NWMT) | 249.0 MWh | Nov 1979 | Dec 2023 | Distillate Fuel Oil |
| Oklahoma Wind Energy Center | FPL Energy Oklahoma Wind LLC | Woodward, OK | Southwest Power Pool (SWPP) | 153.0 GWh | Sep 2003 | Dec 2023 | Wind |
| OU Spirit Wind Farm | Oklahoma Gas & Electric Co | Woodward, OK | Southwest Power Pool (SWPP) | 141.4 GWh | Nov 2009 | Dec 2023 | Wind |
| Old Court Rd Solar | Old Court Rd Solar, LLC | Woodstock, MD | PJM Interconnection, LLC (PJM) | 3.4 GWh | Sep 2019 | Dec 2023 | Solar |
| OE_ALD | OE_ALD | Wing, AL | Southern Company Services, Inc. - Trans (SOCO) | 147.6 GWh | Mar 2023 | Mar 2025 | Solar |
| Olsen | Olsen Power Partners | Whitmore, CA | California Independent System Operator (CISO) | 18.4 GWh | Dec 1989 | Dec 2023 | Water |
| Oneida - West | Oneida DG Solar, LLC | Whitestown, NY | New York Independent System Operator (NYIS) | 2.3 GWh | Nov 2015 | Dec 2023 | Solar |
| Oneida - South | Oneida DG Solar, LLC | Whitestown, NY | New York Independent System Operator (NYIS) | 2.3 GWh | Nov 2015 | Dec 2023 | Solar |
| Oakdale Power Station | Massachusetts Water Res Auth | West Boylston, MA | ISO New England (ISNE) | 12.0 GWh | Apr 1951 | Dec 2023 | Water |
| Oak Leaf Solar XXV LLC (CSG) | Greenbacker Renewable Energy Corporation | Watkins, CO | Public Service Company of Colorado (PSCO) | 3.0 GWh | Nov 2018 | Dec 2023 | Solar |
| Oak Leaf Solar XXIV LLC (CSG) | Greenbacker Renewable Energy Corporation | Watkins, CO | Public Service Company of Colorado (PSCO) | 3.1 GWh | Dec 2018 | Dec 2023 | Solar |
| Oak Leaf Solar XXIII LLC (CSG) | Greenbacker Renewable Energy Corporation | Watkins, CO | Public Service Company of Colorado (PSCO) | 3.5 GWh | Dec 2018 | Dec 2023 | Solar |
| Oak Leaf Solar XXI (CSG) | Greenbacker Renewable Energy Corporation | Watkins, CO | Public Service Company of Colorado (PSCO) | 3.5 GWh | Nov 2018 | Dec 2023 | Solar |
| Oak Leaf - CSG Portfolio (OL 44) | Distributed Solar Development, LLC | Watkins, CO | Southwest Power Pool (SWPP) | 3.4 GWh | Nov 2020 | Dec 2023 | Solar |
| Oak Leaf - CSG Portfolio (OL 39) | Distributed Solar Development, LLC | Watkins, CO | Southwest Power Pool (SWPP) | 3.5 GWh | May 2021 | Dec 2023 | Solar |
| Oak Leaf - CSG Portfolio (OL 38) | Distributed Solar Development, LLC | Watkins, CO | Southwest Power Pool (SWPP) | 3.4 GWh | May 2021 | Dec 2023 | Solar |
| Oak Leaf - CSG Portfolio (OL 37) | Distributed Solar Development, LLC | Watkins, CO | Southwest Power Pool (SWPP) | 3.3 GWh | Nov 2020 | Dec 2023 | Solar |
| Oak Leaf - CSG Portfolio (OL 36) | Distributed Solar Development, LLC | Watkins, CO | Southwest Power Pool (SWPP) | 2.6 GWh | May 2021 | Dec 2023 | Solar |
| OYA Wayside Drive | OYA Wayside Drive LLC | Watertown, NY | New York Independent System Operator (NYIS) | 9.5 GWh | Sep 2022 | Dec 2023 | Solar |
| Oxon Run CREF | Oxon Run Community Renewable Energy Facility | Washington, DC | PJM Interconnection, LLC (PJM) | 3.2 GWh | Nov 2021 | Dec 2023 | Solar |
| Oceana Solar | Virginia Electric & Power Co | Virginia Beach, VA | PJM Interconnection, LLC (PJM) | 29.0 GWh | Nov 2017 | Dec 2023 | Solar |
| OTHERCitizensHospital | Texas Microgrid, LLC | Victoria, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 823.0 MWh | Mar 2020 | Dec 2023 | Natural Gas |
| Orange Blossom Solar Center | Florida Power & Light Co | Vero Beach, FL | Florida Power & Light Co. (FPL) | 147.6 GWh | Apr 2021 | Mar 2025 | Solar |
| Okeechobee Solar | Florida Power & Light Co | Vero Beach, FL | Florida Power & Light Co. (FPL) | 153.6 GWh | Mar 2020 | Mar 2025 | Solar |
| OCI Alamo 5 LLC | Consolidated Edison Development Inc. | Uvalde, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 197.1 GWh | Nov 2015 | Dec 2023 | Solar |
| OER Monarch CSG | Standard Solar | Upper Marlboro, MD | PJM Interconnection, LLC (PJM) | 3.4 GWh | Nov 2021 | Dec 2023 | Solar |
| OREG 3 Inc | Ormat Nevada Inc | Trimont, MN | Midcontinent Independent System Operator, Inc. (MISO) | 38.8 GWh | Jul 2010 | Mar 2025 | Waste Heat |
| OER Checkerspot | Standard Solar | Tracy's Landing, MD | PJM Interconnection, LLC (PJM) | 3.0 GWh | Nov 2021 | Dec 2023 | Solar |
| Owens Corning Headquarters | Luminace Solar Holding, LLC | Toledo, OH | PJM Interconnection, LLC (PJM) | 1.4 GWh | Aug 2015 | Dec 2023 | Solar |
| Ocotillo | Arizona Public Service Co | Tempe, AZ | Arizona Public Service Company (AZPS) | 442.8 GWh | Feb 1960 | Mar 2025 | Natural Gas |
| Olive View Medical Center | Los Angeles County DHS | Sylmar, CA | Los Angeles Department of Water and Power (LDWP) | 11.4 GWh | Jan 1987 | Feb 2024 | Natural Gas |
| Osborn Wind Energy | Osborn Wind Energy LLC | Stewartsville, MO | Southwest Power Pool (SWPP) | 725.2 GWh | Nov 2016 | Mar 2025 | Wind |
| Ouachita | Entergy Louisiana LLC | Sterlington, LA | Midcontinent Independent System Operator, Inc. (MISO) | 4.4 TWh | Jul 2002 | Feb 2025 | Natural Gas |
| Ontario LFGTE | Seneca Energy II | Stanley, NY | New York Independent System Operator (NYIS) | 78.4 GWh | Oct 2003 | Dec 2023 | Landfill Gas |
| OE_MS6 | OE_MS6 | St.Artesia, MS | Tennessee Valley Authority (TVA) | 266.2 GWh | - | Mar 2025 | Solar : 99.9% |
| Orion Community Solar | Orion Community Solar | St. Joseph, MN | Midcontinent Independent System Operator, Inc. (MISO) | 4.6 GWh | Dec 2016 | Dec 2023 | Solar |
| Osceola Generating Station (FL) | Orlando Utilities Comm | St. Cloud, FL | Duke Energy Florida, Inc. (FPC) | 676.0 MWh | Nov 2001 | Dec 2023 | Natural Gas : 90.0% Distillate Fuel Oil : 10.0% |
| Oak Street Solar | Citizens Enterprises Corporation | Springfield, MA | ISO New England (ISNE) | 5.4 GWh | Nov 2019 | Dec 2023 | Solar |
| Ozarks Natural Energy Community Solar | Ozarks Electric Coop Corp - (AR) | Springdale, AR | Southwest Power Pool (SWPP) | 1.3 GWh | Mar 2016 | Dec 2023 | Solar |
| Okeelanta Cogeneration | New Hope Power Company | South Bay, FL | Florida Power & Light Co. (FPL) | 42.7 GWh | Dec 1995 | Mar 2025 | Agricultural By-Products : 96.9% Natural Gas : 3.1% |
| Ohio Falls | Louisville Gas & Electric Co | Shippingport Island, KY | Louisville Gas and Electric Company and Kentucky Utilities Company (LGEE) | 272.0 GWh | Dec 1927 | Dec 2023 | Water |
| Onion River | Wisconsin Power & Light Co | Sheboygan Cedar Grove, WI | Midcontinent Independent System Operator, Inc. (MISO) | 212.6 GWh | Nov 2023 | Mar 2025 | Solar |
| Oconee | Duke Energy Carolinas, LLC | Seneca, SC | Duke Energy Carolinas (DUK) | 21.6 TWh | Jun 1973 | Mar 2025 | Nuclear |
| Onyx - Saratoga Springs Landfill Solar CSG | Onyx Asset Services Group | Saratoga Springs, NY | New York Independent System Operator (NYIS) | 2.7 GWh | Oct 2017 | Dec 2023 | Solar |
| Ontario Sun | Azimuth 180 Solar Electric, LLC | Sandy Creek, NY | New York Independent System Operator (NYIS) | 2.1 GWh | Jan 2023 | Dec 2023 | Solar |
| One Market Plaza | Paramount Group Inc | San Francisco, CA | California Independent System Operator (CISO) | 993.0 MWh | Nov 2003 | Dec 2023 | Natural Gas |
| Otay Mesa Generating Project | Otay Mesa Energy Center LLC | San Diego, CA | California Independent System Operator (CISO) | 2.2 TWh | Sep 2009 | Mar 2025 | Natural Gas |
| OES Biogas Power | Organic Energy Solutions, Inc. | San Bernardino, CA | California Independent System Operator (CISO) | 348.0 MWh | - | Dec 2023 | Other Biomass Gas |
| OCI Alamo 3 LLC | Consolidated Edison Development Inc. | San Antonio, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 10.3 GWh | Nov 2014 | Dec 2023 | Solar |
| O W Sommers | City of San Antonio - (TX) | San Antonio, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 1.9 TWh | Mar 1972 | Dec 2023 | Natural Gas |
| OCI Alamo Solar I Hybrid | OCI Solar Power | San Antonio, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 88.3 GWh | Nov 2013 | Dec 2023 | Solar |
| OE_AZ1 | Onward Energy | Salome, AZ | Western Area Power Administration - Desert Southwest Region (WALC) | 87.5 GWh | Nov 2019 | Mar 2025 | Solar |
| Oak Leaf Solar XXXIII LLC (Lantz) | Greenbacker Renewable Energy Corporation | Salida, CO | Public Service Company of Colorado (PSCO) | 3.9 GWh | Dec 2019 | Dec 2023 | Solar |
| Orion II Solar Project | Ben Milam Solar 2 LLC | Rosebud, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 228.6 GWh | - | Mar 2025 | Solar |
| Onyx - Lamphear Road CSG | Onyx Asset Services Group | Rome, NY | New York Independent System Operator (NYIS) | 2.7 GWh | Sep 2016 | Dec 2023 | Solar |
| Organ Church Solar | MN8 Energy LLC | Rockwell, NC | Duke Energy Carolinas (DUK) | 10.3 GWh | Jan 2019 | Dec 2023 | Solar |
| Olmsted Waste Energy | Olmsted County Public Works | Rochester, MN | Midcontinent Independent System Operator, Inc. (MISO) | 39.5 GWh | Mar 1987 | Dec 2023 | Non-biogenic Municipal Solid Waste : 54.5% Biogenic Municipal Solid Waste : 44.6% Natural Gas : 0.9% |
| Old Middleboro Road Solar | Agilitas Energy, Inc. | Rochester, MA | ISO New England (ISNE) | 9.7 GWh | Dec 2022 | Dec 2023 | Solar |
| Oneida | PacifiCorp | Riverdale, ID | PacifiCorp East (PACE) | 42.4 GWh | Jun 1915 | Dec 2023 | Water |
| Oak Leaf Solar XXXII (CSG) | Greenbacker Renewable Energy Corporation | Rifle, CO | Public Service Company of Colorado (PSCO) | 3.1 GWh | Feb 2019 | Dec 2023 | Solar |
| Omtanke Solar | DG South Carolina Solar, LLC | Ridgeville, SC | South Carolina Public Service Authority (SC) | 10.4 GWh | Feb 2020 | Dec 2023 | Solar |
| Ontelaunee Energy Center | Ontelaunee Energy Center | Reading, PA | PJM Interconnection, LLC (PJM) | 3.5 TWh | Apr 2002 | Mar 2025 | Natural Gas |
| Otter Creek Wind Farm LLC | Avangrid Renewables LLC | Ransom, IL | PJM Interconnection, LLC (PJM) | 470.4 GWh | Feb 2020 | Mar 2025 | Wind |
| OE_FL7 | OE_FL7 | Putnam, FL | Florida Power & Light Co. (FPL) | 23.9 GWh | - | Mar 2025 | Solar |
| OYA Pulaski | OYA Pulaski LLC | Pulaski, NY | New York Independent System Operator (NYIS) | 6.4 GWh | Oct 2022 | Dec 2023 | Solar |
| Outer Cape Community Battery | Eversource | Provincetown, MA | ISO New England (ISNE) | 48.0 MWh | Nov 2022 | Mar 2025 | Electricity used for energy storage |
| O'Brien Wind | MidAmerican Energy Co | Primghar, IA | Midcontinent Independent System Operator, Inc. (MISO) | 834.6 GWh | Aug 2016 | Dec 2023 | Wind |
| Oregon Convention Center | Tesla Inc. | Portland, OR | PacifiCorp West (PACW) | 1.7 GWh | Jun 2016 | Dec 2023 | Solar |
| Oak Leaf Solar XXVIII LLC (CSG) | Greenbacker Renewable Energy Corporation | Platteville, CO | Public Service Company of Colorado (PSCO) | 3.0 GWh | May 2019 | Dec 2023 | Solar |
| Oahe | USACE-Omaha | Pierre, SD | Southwest Power Pool (SWPP) | 2.1 TWh | Mar 1962 | Dec 2023 | Water |
| Onyx - Pembroke Landfill Solar | Onyx Asset Services Group | Pembroke, MA | ISO New England (ISNE) | 3.7 GWh | Nov 2017 | Dec 2023 | Solar |
| Odyssey Solar | Odyssey Solar, LLC | Pelion, SC | Dominion Energy South Carolina, Inc. (SCEG) | 17.5 GWh | Jul 2017 | Dec 2023 | Solar |
| OREG 4 Peetz | Ormat Nevada Inc | Peetz, CO | Western Area Power Administration - Rocky Mountain Region (WACM) | 3.2 GWh | Feb 2009 | May 2024 | Waste Heat |
| One Ten Partners PV | One Ten Partners, LLC | Palmdale, CA | California Independent System Operator (CISO) | 5.4 GWh | Aug 2017 | Dec 2023 | Solar |
| Orange Grove Peaking Facility | Orange Grove Energy LP | Pala, CA | California Independent System Operator (CISO) | 18.1 GWh | May 2010 | Dec 2023 | Natural Gas |
| Ozark | USCE-Little Rock District | Ozark, AR | Southwestern Power Administration (SPA) | 253.1 GWh | Oct 1972 | Dec 2023 | Water |
| Oxnard Paper Mill | New-Indy, Oxnard LLC | Oxnard, CA | California Independent System Operator (CISO) | 192.3 GWh | Feb 1986 | Mar 2025 | Natural Gas |
| Oxnard | Procter&Gamble Paper Products Co-Oxnard | Oxnard, CA | California Independent System Operator (CISO) | 483.8 GWh | Jun 1982 | Mar 2025 | Natural Gas |
| Oxnard Wastewater Treatment Plant | Oxnard City of | Oxnard, CA | California Independent System Operator (CISO) | 4.7 GWh | Jul 1981 | Mar 2025 | Other Biomass Gas : 93.4% Natural Gas : 6.6% |
| Ormond Beach | Ormond Beach Power, LLC | Oxnard, CA | California Independent System Operator (CISO) | 45.1 GWh | Jul 1971 | Mar 2025 | Natural Gas |
| Oxford (NE) | Village of Oxford - (NE) | Oxford, NE | Southwest Power Pool (SWPP) | 27.0 MWh | Jul 1953 | Dec 2023 | Natural Gas : 91.0% Distillate Fuel Oil : 9.0% |
| Oxford | CVI CleanCapital Solar 6 | Oxford, MA | ISO New England (ISNE) | 3.9 GWh | Jun 2014 | Dec 2023 | Solar |
| Oxford Solar | Citizens Enterprises Corporation | Oxford, MA | ISO New England (ISNE) | 6.5 GWh | Jan 2020 | Dec 2023 | Solar |
| Oxford PV - BD Solar Oxford LLC | BD Solar Oxford LLC | Oxford, ME | ISO New England (ISNE) | 10.9 GWh | May 2021 | Dec 2023 | Solar |
| Oxbow (OR) | Idaho Power Co | Oxbow, OR | Idaho Power Company (IPCO) | 900.1 GWh | Jun 1961 | Dec 2023 | Water |
| Owatonna | City of Owatonna - (MN) | Owatonna, MN | Midcontinent Independent System Operator, Inc. (MISO) | 1.4 GWh | Mar 1982 | Dec 2023 | Natural Gas |
| Owatonna Energy Station | Southern Minnesota Mun P Agny | Owatonna, MN | Midcontinent Independent System Operator, Inc. (MISO) | 53.5 GWh | Feb 2018 | Dec 2023 | Natural Gas |
| Ottumwa City of | Ottumwa City of | Ottumwa, IA | Midcontinent Independent System Operator, Inc. (MISO) | 5.3 GWh | Jul 1931 | Dec 2023 | Water |
| Ottumwa | Interstate Power and Light Co | Ottumwa, IA | Midcontinent Independent System Operator, Inc. (MISO) | 1.7 TWh | Apr 1981 | Mar 2025 | Subbituminous Coal : 99.6% |
| Ottawa | City of Ottawa - (KS) | Ottawa, KS | Southwest Power Pool (SWPP) | 377.0 MWh | Nov 1958 | Dec 2023 | Natural Gas : 78.7% Distillate Fuel Oil : 21.3% |
| Otsego Mill Power Plant | Otsego Paper Inc | Otsego, MI | Midcontinent Independent System Operator, Inc. (MISO) | 161.2 GWh | Oct 1995 | Dec 2023 | Natural Gas |
| Oswego Harbor Power | Oswego Harbor Power | Oswego, NY | New York Independent System Operator (NYIS) | 52.3 GWh | May 1975 | Jan 2025 | Residual Fuel Oil |
| Onondaga County- Clearwater | Tesla Inc. | Oswego, NY | ISO New England (ISNE) | 2.6 GWh | Jun 2017 | Dec 2023 | Solar |
| Oswego | NY USLE Oswego SR104 LLC | Oswego, NY | New York Independent System Operator (NYIS) | 457.0 MWh | Aug 2023 | Dec 2023 | Solar |
| Osborne | City of Osborne - (KS) | Osborne, KS | Southwest Power Pool (SWPP) | 7.8 MWh | May 1957 | Dec 2023 | Distillate Fuel Oil : 60.7% Natural Gas : 39.3% |
| Osawatomie Power Plant North Sub | City of Osawatomie - (KS) | Osawatomie, KS | Southwest Power Pool (SWPP) | 5.0 MWh | Apr 2018 | Dec 2023 | Distillate Fuel Oil |
| Osawatomie City of | City of Osawatomie - (KS) | Osawatomie, KS | Southwest Power Pool (SWPP) | 10.0 MWh | Sep 1950 | Dec 2023 | Distillate Fuel Oil |
| Osawatomie Power Plant South Sub | City of Osawatomie - (KS) | Osawatomie, KS | Southwest Power Pool (SWPP) | 6.0 MWh | Feb 2017 | Dec 2023 | Distillate Fuel Oil |
| Osage (IA) | City of Osage - (IA) | Osage, IA | Midcontinent Independent System Operator, Inc. (MISO) | 3.8 GWh | Aug 1963 | Dec 2023 | Wind : 73.8% Solar : 26.2% |
Summary of Power Plants By State
Figures are based on March 2025 generation numbers.| State | Rank | Active Plants | Mar 2025 Generation |
|---|---|---|---|
| Alabama | # 7 | 75 | 10,399.45 GWh |
| Alaska | # 48 | 137 | 460.30 GWh |
| Arizona | # 16 | 167 | 7,756.35 GWh |
| Arkansas | # 29 | 79 | 4,503.48 GWh |
| California | # 5 | 1,565 | 15,306.94 GWh |
| Colorado | # 30 | 257 | 4,337.74 GWh |
| Connecticut | # 31 | 152 | 3,831.37 GWh |
| Delaware | # 50 | 30 | 183.34 GWh |
| District of Columbia | # 51 | 12 | 15.27 GWh |
| Florida | # 3 | 305 | 18,686.61 GWh |
| Georgia | # 9 | 239 | 9,979.52 GWh |
| Hawaii | # 46 | 67 | 749.10 GWh |
| Idaho | # 43 | 126 | 1,488.21 GWh |
| Illinois | # 4 | 332 | 15,592.21 GWh |
| Indiana | # 12 | 201 | 8,849.97 GWh |
| Iowa | # 20 | 279 | 6,323.45 GWh |
| Kansas | # 25 | 157 | 5,176.23 GWh |
| Kentucky | # 24 | 56 | 5,180.56 GWh |
| Louisiana | # 18 | 81 | 6,708.43 GWh |
| Maine | # 45 | 157 | 1,313.29 GWh |
| Maryland | # 39 | 179 | 2,427.73 GWh |
| Massachusetts | # 42 | 597 | 1,608.56 GWh |
| Michigan | # 10 | 263 | 9,898.87 GWh |
| Minnesota | # 26 | 736 | 5,082.27 GWh |
| Mississippi | # 19 | 53 | 6,374.07 GWh |
| Missouri | # 21 | 116 | 5,776.95 GWh |
| State | Rank | Active Plants | Mar 2025 Generation |
|---|---|---|---|
| Montana | # 40 | 67 | 2,309.70 GWh |
| Nebraska | # 37 | 117 | 3,008.88 GWh |
| Nevada | # 34 | 109 | 3,381.98 GWh |
| New Hampshire | # 44 | 56 | 1,374.49 GWh |
| New Jersey | # 28 | 371 | 4,514.07 GWh |
| New Mexico | # 35 | 138 | 3,378.20 GWh |
| New York | # 8 | 818 | 10,278.94 GWh |
| North Carolina | # 11 | 877 | 9,080.20 GWh |
| North Dakota | # 33 | 57 | 3,690.67 GWh |
| Ohio | # 6 | 190 | 11,252.37 GWh |
| Oklahoma | # 17 | 129 | 6,972.70 GWh |
| Oregon | # 22 | 254 | 5,543.74 GWh |
| Pennsylvania | # 2 | 237 | 19,658.43 GWh |
| Rhode Island | # 47 | 94 | 622.24 GWh |
| South Carolina | # 14 | 194 | 8,606.12 GWh |
| South Dakota | # 41 | 52 | 1,945.10 GWh |
| Tennessee | # 23 | 85 | 5,241.09 GWh |
| Texas | # 1 | 818 | 43,194.33 GWh |
| Utah | # 36 | 114 | 3,056.84 GWh |
| Vermont | # 49 | 112 | 230.44 GWh |
| Virginia | # 15 | 214 | 8,465.83 GWh |
| Washington | # 13 | 127 | 8,662.62 GWh |
| West Virginia | # 38 | 36 | 2,977.95 GWh |
| Wisconsin | # 27 | 222 | 4,571.79 GWh |
| Wyoming | # 32 | 69 | 3,817.24 GWh |