Directory of Power Plants in the United States
| Plant Name | Utility | Location | Balancing Authority | Annual Generation | Plant Date | Last Update | Fuel Types |
|---|---|---|---|---|---|---|---|
| Orchard Avenue 1 | Yakima-Tieton Irrigation Dist | Yakima, WA | PacifiCorp West (PACW) | 2.5 GWh | Feb 1987 | Sep 2024 | Water |
| Oneida Herkimer | WM Renewable Energy LLC | Boonville, NY | New York Independent System Operator (NYIS) | 25.3 GWh | Mar 2012 | Dec 2024 | Landfill Gas |
| Omega Hills Gas Recovery | WM Renewable Energy LLC | Germantown, WI | Midcontinent Independent System Operator, Inc. (MISO) | 80.1 GWh | Nov 1985 | Sep 2025 | Landfill Gas |
| Onion River | Wisconsin Power & Light Co | Sheboygan Cedar Grove, WI | Midcontinent Independent System Operator, Inc. (MISO) | 252.6 GWh | Nov 2023 | Sep 2025 | Solar |
| Oil Dri 2 Solar | Westbound Solar LLC | Ochlocknee, GA | Southern Company Services, Inc. - Trans (SOCO) | 2.9 GWh | Apr 2019 | Dec 2024 | Solar |
| Overlook | Westbound Solar 3, LLC | Westminster, MA | ISO New England (ISNE) | 6.9 GWh | Feb 2023 | Dec 2024 | Solar |
| Oak Ridge LFGTE | Wabash Valley Power Assn, Inc | Logansport, IN | Midcontinent Independent System Operator, Inc. (MISO) | 25.8 GWh | Nov 2003 | Dec 2024 | Landfill Gas |
| Oceana Solar | Virginia Electric & Power Co | Virginia Beach, VA | PJM Interconnection, LLC (PJM) | 28.5 GWh | Nov 2017 | Dec 2024 | Solar |
| Oak Bluffs Diesel Generating Facility | Vineyard Reliability LLC | Oak Bluffs, MA | ISO New England (ISNE) | 2.1 GWh | Dec 1968 | Dec 2024 | Distillate Fuel Oil |
| Oxford (NE) | Village of Oxford - (NE) | Oxford, NE | Southwest Power Pool (SWPP) | 27.0 MWh | Jul 1953 | Dec 2024 | Natural Gas : 89.8% Distillate Fuel Oil : 10.2% |
| Old Hickory | USCE-Nashville District | Hendersonville, TN | Tennessee Valley Authority (TVA) | 436.6 GWh | Mar 1957 | Dec 2024 | Water |
| Ozark | USCE-Little Rock District | Ozark, AR | Southwestern Power Administration (SPA) | 314.7 GWh | Oct 1972 | Dec 2024 | Water |
| Oahe | USACE-Omaha | Pierre, SD | Southwest Power Pool (SWPP) | 2.2 TWh | Mar 1962 | Dec 2024 | Water |
| Osage Dam | Union Electric Co - (MO) | Eldon, MO | Midcontinent Independent System Operator, Inc. (MISO) | 497.1 GWh | Sep 1931 | Dec 2024 | Water |
| O'Fallon Renewable Energy Center | Union Electric Co - (MO) | O'Fallon, MO | Midcontinent Independent System Operator, Inc. (MISO) | 2.3 GWh | Nov 2014 | Dec 2024 | Solar |
| Oso Grande Wind Farm | Tucson Electric Power Co | Maljamar, NM | Tucson Electric Power (TEPC) | 628.5 GWh | Apr 2021 | Sep 2025 | Wind |
| Orange Street G1 | Town of Bedford - (VA) | Bedford, VA | PJM Interconnection, LLC (PJM) | 168.0 MWh | Jun 2005 | Dec 2024 | Distillate Fuel Oil |
| Oskaloosa | Today's Power, Inc. | Oskaloosa, KS | Southwest Power Pool (SWPP) | 2.4 GWh | Apr 2021 | Dec 2024 | Solar |
| Ozark Solar Park | Today's Power, Inc. | Lincoln, AR | Southwest Power Pool (SWPP) | 4.5 GWh | Jun 2021 | Dec 2024 | Solar |
| Otarre Solar Park | TIG Sun Energy IV, LLC | Cayce, SC | Dominion Energy South Carolina, Inc. (SCEG) | 2.6 GWh | Nov 2017 | Dec 2024 | Solar |
| OTHERTraditionClearfork | Texas Microgrid, LLC | Fort Worth, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 205.0 MWh | Mar 2023 | Dec 2024 | Natural Gas |
| OTHERTraditionBuffalo | Texas Microgrid, LLC | Houston, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 202.0 MWh | May 2024 | Dec 2024 | Natural Gas |
| OTHERTexasA&M | Texas Microgrid, LLC | Bryan, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 1.3 GWh | Apr 2018 | Dec 2024 | Natural Gas |
| OTHERNFBWA | Texas Microgrid, LLC | Houston, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 321.0 MWh | Jan 2021 | Dec 2024 | Natural Gas |
| OTHERCitizensHospital | Texas Microgrid, LLC | Victoria, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 625.0 MWh | Mar 2020 | Dec 2024 | Natural Gas |
| Onondaga County - Oak Orchard WWTP | Tesla Inc. | Clay, NY | New York Independent System Operator (NYIS) | 2.5 GWh | Oct 2017 | Dec 2024 | Solar |
| Oregon University System Rabbit Field | Tesla Inc. | Corvallis, OR | PacifiCorp West (PACW) | 1.2 GWh | Feb 2014 | Dec 2024 | Solar |
| Onondaga County - Metro Water Board | Tesla Inc. | Clay, NY | New York Independent System Operator (NYIS) | 1.1 GWh | Jan 2016 | Dec 2024 | Solar |
| Oregon Convention Center | Tesla Inc. | Portland, OR | PacifiCorp West (PACW) | 1.6 GWh | Jun 2016 | Dec 2024 | Solar |
| Onondaga County- Jamesville | Tesla Inc. | Jamesville, NY | New York Independent System Operator (NYIS) | 1.9 GWh | Feb 2018 | Dec 2024 | Solar |
| Orange County Solar Farm (NY) | Tesla Inc. | Goshen, NY | ISO New England (ISNE) | 2.5 GWh | Apr 2017 | Dec 2024 | Solar |
| Onondaga County- Clearwater | Tesla Inc. | Oswego, NY | ISO New England (ISNE) | 2.8 GWh | Jun 2017 | Dec 2024 | Solar |
| Oswego County - Fulton Solar | Tesla Inc. | Fulton, NY | New York Independent System Operator (NYIS) | 2.2 GWh | May 2018 | Dec 2024 | Solar |
| Oregon University System OIT Klamath Fal | Tesla Inc. | Klamath Falls, OR | PacifiCorp West (PACW) | 2.5 GWh | Dec 2013 | Dec 2024 | Solar |
| Oneida County- DPW | Tesla Inc. | Oriskany, NY | ISO New England (ISNE) | 1.8 GWh | Sep 2017 | Dec 2024 | Solar |
| Orange PV | Terraform Arcadia | Orange, MA | ISO New England (ISNE) | 2.6 GWh | Jun 2013 | Dec 2024 | Solar |
| Oasis Wind | Terra-Gen Operating Co-Wind | Mojave, CA | California Independent System Operator (CISO) | 238.4 GWh | Nov 2004 | Dec 2024 | Wind |
| Oak Creek Energy Systems I | Terra-Gen Operating Co-Wind | Mojave, CA | California Independent System Operator (CISO) | 54.5 GWh | May 1982 | Dec 2024 | Wind |
| Oasis Alta | Terra-Gen Operating Co-Wind | Mojave, CA | California Independent System Operator (CISO) | 57.0 GWh | Mar 2021 | Dec 2024 | Wind |
| Ocoee 1 | Tennessee Valley Authority | Benton, TN | Tennessee Valley Authority (TVA) | 69.2 GWh | Dec 1911 | Dec 2024 | Water |
| Ocoee 2 | Tennessee Valley Authority | Benton, TN | Tennessee Valley Authority (TVA) | 86.7 GWh | Sep 1913 | Dec 2024 | Water |
| Ocoee 3 | Tennessee Valley Authority | Benton, TN | Tennessee Valley Authority (TVA) | 151.7 GWh | Mar 1943 | Dec 2024 | Water |
| Old Wire Farm | Strata Manager, LLC | Laurel Hill, NC | Duke Energy Progress East (CPLE) | 10.3 GWh | Nov 2016 | Dec 2024 | Solar |
| Overhill Solar | Strata Manager, LLC | Clinton, NC | Duke Energy Carolinas (DUK) | 10.9 GWh | Feb 2022 | Dec 2024 | Solar |
| OER Checkerspot | Standard Solar | Tracy's Landing, MD | PJM Interconnection, LLC (PJM) | 2.7 GWh | Nov 2021 | Dec 2024 | Solar |
| OER Monarch CSG | Standard Solar | Upper Marlboro, MD | PJM Interconnection, LLC (PJM) | 3.6 GWh | Nov 2021 | Dec 2024 | Solar |
| OER Patuxent CSG | Standard Solar | Lothian, MD | PJM Interconnection, LLC (PJM) | 4.3 GWh | Oct 2022 | Dec 2024 | Solar |
| Owatonna Energy Station | Southern Minnesota Mun P Agny | Owatonna, MN | Midcontinent Independent System Operator, Inc. (MISO) | 13.4 GWh | Feb 2018 | Dec 2024 | Natural Gas |
| Oak Hill Solar Array | Southern Indiana Gas & Elec Co | Evansville, IN | Midcontinent Independent System Operator, Inc. (MISO) | 3.3 GWh | Oct 2018 | Dec 2024 | Solar |
| Old Plank Road Solar Farm, LLC | Southeastern Solar Farm Fund, LLC | Jacksonville, FL | JEA (JEA) | 5.5 GWh | Sep 2017 | Dec 2024 | Solar |
| Orange Coast College PH2 Solar Project | Solar Star Coastal Pirate, LLC | Costa Mesa, CA | California Independent System Operator (CISO) | 4.0 GWh | Apr 2022 | Dec 2024 | Solar |
| Ontario LFGTE | Seneca Energy II | Stanley, NY | New York Independent System Operator (NYIS) | 68.5 GWh | Oct 2003 | Dec 2024 | Landfill Gas |
| Open Sky Dairy | Renewable Solar, Inc | Riverdale, CA | California Independent System Operator (CISO) | 2.1 GWh | Jun 2024 | Dec 2024 | Solar |
| Oxnard | Procter&Gamble Paper Products Co-Oxnard | Oxnard, CA | California Independent System Operator (CISO) | 479.4 GWh | Jun 1982 | Sep 2025 | Natural Gas |
| Oak Grove | Portland General Electric Co | Estacada, OR | Portland General Electric Company (PGE) | 150.1 GWh | Jul 1924 | Dec 2024 | Water |
| Otero Solar | PNM Resources | La Luz, NM | Public Service Company of New Mexico (PNM) | 17.1 GWh | Nov 2013 | Dec 2024 | Solar |
| Oxbow (CA) | Placer County Water Agency | Foresthill, CA | California Independent System Operator (CISO) | 29.2 GWh | Sep 1966 | Sep 2024 | Water |
| Ocotillo Express LLC | Pattern Operators LP | Ocotillo, CA | California Independent System Operator (CISO) | 461.7 GWh | Nov 2012 | Sep 2025 | Wind |
| One Market Plaza | Paramount Group Inc | San Francisco, CA | California Independent System Operator (CISO) | 177.0 MWh | Nov 2003 | Dec 2024 | Natural Gas |
| Oakboro Farm | Palmetto Power Management LLC | Laurinburg, NC | Duke Energy Carolinas (DUK) | 8.4 GWh | Aug 2014 | Dec 2024 | Solar |
| Oneida | PacifiCorp | Riverdale, ID | PacifiCorp East (PACE) | 42.0 GWh | Jun 1915 | Dec 2024 | Water |
| Ozarks Natural Energy Community Solar | Ozarks Electric Coop Corp - (AR) | Springdale, AR | Southwest Power Pool (SWPP) | 935.0 MWh | Mar 2016 | Dec 2024 | Solar |
| OYA Wayside Drive | OYA Wayside Drive LLC | Watertown, NY | New York Independent System Operator (NYIS) | 8.0 GWh | Sep 2022 | Dec 2024 | Solar |
| OYA State Route 122 | OYA State Route 122, LLC | Constable, NY | New York Independent System Operator (NYIS) | 6.9 GWh | Nov 2021 | Dec 2024 | Solar |
| OYA Robinson Road | OYA Robinson Road, LLC | Orleans, NY | New York Independent System Operator (NYIS) | 9.7 GWh | May 2022 | Dec 2024 | Solar |
| OYA Pulaski | OYA Pulaski LLC | Pulaski, NY | New York Independent System Operator (NYIS) | 5.8 GWh | Oct 2022 | Dec 2024 | Solar |
| OYA Main Street | OYA Main Street LLC | York, NY | New York Independent System Operator (NYIS) | 8.1 GWh | Nov 2022 | Dec 2024 | Solar |
| OYA Church Road | OYA Church Road A LLC | Baldwinsville, NY | New York Independent System Operator (NYIS) | 8.2 GWh | Nov 2022 | Dec 2024 | Solar |
| Oxy Renewable Energy - Goldsmith | Oxy Renewable Energy LLC | Goldsmith, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 40.5 GWh | Apr 2020 | Dec 2024 | Solar |
| Oxon Run CREF | Oxon Run Community Renewable Energy Facility | Washington, DC | PJM Interconnection, LLC (PJM) | 1.5 GWh | Nov 2021 | Dec 2024 | Solar |
| Oxnard Wastewater Treatment Plant | Oxnard City of | Oxnard, CA | California Independent System Operator (CISO) | 4.2 GWh | Jul 1981 | Sep 2025 | Other Biomass Gas : 95.1% Natural Gas : 4.9% |
| Oxbow Creek | Oxbow Creek Energy LLC | Factoryville, PA | PJM Interconnection, LLC (PJM) | 41.0 GWh | Nov 2019 | Dec 2024 | Natural Gas |
| Owyhee Dam Power Project | Owyhee Irrigation District | Nyssa, OR | Idaho Power Company (IPCO) | 27.6 GWh | Jul 1985 | Oct 2024 | Water |
| Owlville Creek Solar, LLC | Owlville Creek Solar, LLC | Canastota, NY | New York Independent System Operator (NYIS) | 8.4 GWh | Nov 2020 | Dec 2024 | Solar |
| Owlville Creek Solar 2, LLC | Owlville Creek Solar 2, LLC | Canastota, NY | New York Independent System Operator (NYIS) | 7.8 GWh | Nov 2020 | Dec 2024 | Solar |
| Owen Solar | Owen Solar LLC | Lincolnton, NC | Duke Energy Carolinas (DUK) | 8.0 GWh | Mar 2016 | Dec 2024 | Solar |
| Overman Solar | Overman Solar, LLC | Goldsboro, NC | Duke Energy Progress East (CPLE) | 10.7 GWh | Nov 2021 | Dec 2024 | Solar |
| Outback Solar At Christmas Valley | Outback Solar, LLC | Christmas Valley, OR | Bonneville Power Administration (BPAT) | 6.6 GWh | Sep 2012 | Dec 2024 | Solar |
| Ottumwa City of | Ottumwa City of | Ottumwa, IA | Midcontinent Independent System Operator, Inc. (MISO) | 4.5 GWh | Jul 1931 | Apr 2024 | Water |
| Otter Creek Ethanol Poet - Ashton | Otter Creek Ethanol LLC - Poet Ashton | Ashton, IA | Midcontinent Independent System Operator, Inc. (MISO) | 43.5 GWh | Feb 2004 | Sep 2025 | Natural Gas |
| Otsego Mill Power Plant | Otsego Paper Inc | Otsego, MI | Midcontinent Independent System Operator, Inc. (MISO) | 165.5 GWh | Oct 1995 | Dec 2024 | Natural Gas |
| Otis Elevator Company Solar | Otis Elevator Company | Florence, SC | Duke Energy Carolinas (DUK) | 1.5 GWh | Apr 2018 | Dec 2024 | Solar |
| Otay Mesa Generating Project | Otay Mesa Energy Center LLC | San Diego, CA | California Independent System Operator (CISO) | 1.8 TWh | Sep 2009 | Sep 2025 | Natural Gas |
| Oswego Harbor Power | Oswego Harbor Power | Oswego, NY | New York Independent System Operator (NYIS) | 91.0 GWh | May 1975 | Aug 2025 | Residual Fuel Oil : 99.5% |
| Oswego County Energy Recovery | Oswego County | Fulton, NY | New York Independent System Operator (NYIS) | 8.1 GWh | Jan 1986 | Dec 2024 | Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0% |
| OSLH, LLC | OSLH, LLC | Bend, OR | PacifiCorp West (PACW) | 22.2 GWh | Nov 2016 | Dec 2024 | Solar |
| Osceola Windpower LLC | Osceola Windpower LLC | Harris, IA | Southwest Power Pool (SWPP) | 386.7 GWh | Jun 2008 | Sep 2025 | Wind |
| Osceola Windpower II | Osceola Windpower II | Harris, IA | Midcontinent Independent System Operator, Inc. (MISO) | 196.9 GWh | Aug 2008 | Sep 2025 | Wind |
| Osborn Wind Energy | Osborn Wind Energy LLC | Stewartsville, MO | Southwest Power Pool (SWPP) | 680.9 GWh | Nov 2016 | Sep 2025 | Wind |
| Ormond Beach | Ormond Beach Power, LLC | Oxnard, CA | California Independent System Operator (CISO) | 43.1 GWh | Jul 1971 | Aug 2025 | Natural Gas |
| Ormesa II | Ormat Nevada Inc | Holtville, CA | Imperial Irrigation District (IID) | 131.7 GWh | Apr 1989 | Dec 2024 | Geothermal |
| Ormesa III | Ormat Nevada Inc | Holtville, CA | Imperial Irrigation District (IID) | 44.4 GWh | Apr 1989 | Dec 2024 | Geothermal |
| 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 |
| OREG 3 Inc | Ormat Nevada Inc | Trimont, MN | Midcontinent Independent System Operator, Inc. (MISO) | 43.1 GWh | Jul 2010 | Sep 2025 | Waste Heat |
| OREG 2 Inc | Ormat Nevada Inc | Culbertson, MT | Southwest Power Pool (SWPP) | 118.7 GWh | Nov 2008 | Sep 2025 | Waste Heat |
| OREG 1 Inc | Ormat Nevada Inc | Culbertson, MT | Southwest Power Pool (SWPP) | 143.8 GWh | Jun 2006 | Sep 2025 | Waste Heat |
| Ormesa I | Ormat Nevada Inc | Holtville, CA | Imperial Irrigation District (IID) | 70.2 GWh | Nov 1986 | Dec 2024 | Geothermal |
| Osceola Generating Station (FL) | Orlando Utilities Comm | St. Cloud, FL | Duke Energy Florida, Inc. (FPC) | 623.0 MWh | Nov 2001 | Dec 2024 | Natural Gas : 87.4% Distillate Fuel Oil : 12.6% |
| Orion Solar II | Orion Solar II, LLC | Arvin, CA | California Independent System Operator (CISO) | 19.0 GWh | May 2014 | Dec 2024 | Solar |
| Orion Solar I | Orion Solar I LLC | Arvin, CA | California Independent System Operator (CISO) | 28.3 GWh | Mar 2014 | Dec 2024 | Solar |
Summary of Power Plants By State
Figures are based on September 2025 generation numbers.| State | Rank | Active Plants | Sep 2025 Generation |
|---|---|---|---|
| Alabama | # 7 | 76 | 12,052.47 GWh |
| Alaska | # 48 | 147 | 527.57 GWh |
| Arizona | # 9 | 183 | 11,602.92 GWh |
| Arkansas | # 21 | 117 | 5,844.09 GWh |
| California | # 4 | 1,769 | 19,371.91 GWh |
| Colorado | # 30 | 304 | 4,433.17 GWh |
| Connecticut | # 32 | 168 | 3,779.74 GWh |
| Delaware | # 49 | 33 | 419.31 GWh |
| District of Columbia | # 51 | 16 | 16.99 GWh |
| Florida | # 2 | 323 | 24,446.09 GWh |
| Georgia | # 8 | 266 | 11,628.97 GWh |
| Hawaii | # 47 | 73 | 826.54 GWh |
| Idaho | # 44 | 148 | 1,495.33 GWh |
| Illinois | # 5 | 385 | 14,642.93 GWh |
| Indiana | # 14 | 213 | 8,730.35 GWh |
| Iowa | # 26 | 295 | 5,224.35 GWh |
| Kansas | # 25 | 189 | 5,250.86 GWh |
| Kentucky | # 23 | 60 | 5,806.86 GWh |
| Louisiana | # 13 | 87 | 9,343.34 GWh |
| Maine | # 45 | 217 | 1,135.36 GWh |
| Maryland | # 39 | 204 | 2,935.42 GWh |
| Massachusetts | # 41 | 652 | 1,746.92 GWh |
| Michigan | # 11 | 279 | 10,468.02 GWh |
| Minnesota | # 29 | 769 | 4,717.95 GWh |
| Mississippi | # 20 | 58 | 6,625.37 GWh |
| Missouri | # 22 | 128 | 5,843.17 GWh |
| State | Rank | Active Plants | Sep 2025 Generation |
|---|---|---|---|
| Montana | # 40 | 72 | 1,949.24 GWh |
| Nebraska | # 34 | 132 | 3,501.38 GWh |
| Nevada | # 31 | 114 | 4,053.88 GWh |
| New Hampshire | # 42 | 60 | 1,549.07 GWh |
| New Jersey | # 27 | 399 | 4,969.45 GWh |
| New Mexico | # 36 | 145 | 3,317.84 GWh |
| New York | # 12 | 966 | 10,145.62 GWh |
| North Carolina | # 10 | 917 | 11,211.15 GWh |
| North Dakota | # 37 | 60 | 3,089.17 GWh |
| Ohio | # 6 | 201 | 12,818.31 GWh |
| Oklahoma | # 17 | 143 | 7,364.05 GWh |
| Oregon | # 28 | 282 | 4,812.51 GWh |
| Pennsylvania | # 3 | 260 | 19,731.43 GWh |
| Rhode Island | # 46 | 100 | 863.62 GWh |
| South Carolina | # 16 | 207 | 7,861.23 GWh |
| South Dakota | # 43 | 52 | 1,535.17 GWh |
| Tennessee | # 19 | 88 | 6,829.06 GWh |
| Texas | # 1 | 946 | 51,969.48 GWh |
| Utah | # 35 | 126 | 3,419.48 GWh |
| Vermont | # 50 | 120 | 165.14 GWh |
| Virginia | # 15 | 241 | 8,580.52 GWh |
| Washington | # 18 | 138 | 7,120.43 GWh |
| West Virginia | # 38 | 39 | 3,057.29 GWh |
| Wisconsin | # 24 | 251 | 5,674.74 GWh |
| Wyoming | # 33 | 73 | 3,641.70 GWh |