Directory of Power Plants in the United States
| Plant Name | Utility | Location | Balancing Authority | Annual Generation | Plant Date | Last Update | Fuel Types |
|---|---|---|---|---|---|---|---|
| Oconee | Duke Energy Carolinas, LLC | Seneca, SC | Duke Energy Carolinas (DUK) | 22.6 TWh | Jun 1973 | Sep 2025 | Nuclear |
| Okeechobee Clean Energy Center | Florida Power & Light Co | Okeechobee, FL | Florida Power & Light Co. (FPL) | 11.7 TWh | Feb 2019 | Sep 2025 | Natural Gas |
| Oak Grove (TX) | Luminant Generation Company LLC | Franklin, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 11.0 TWh | Mar 2010 | Sep 2025 | Lignite Coal : 99.0% Natural Gas : 1.0% |
| Odessa-Ector Power Plant | LaFrontera Holdings LLC | Odessa, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 7.9 TWh | Jun 2001 | Sep 2025 | Natural Gas |
| Oregon Clean Energy Center | Oregon Clean Energy Center | Oregon, OH | PJM Interconnection, LLC (PJM) | 5.9 TWh | Jun 2017 | Sep 2025 | Natural Gas |
| Oneta Energy Center | Oneta Power LLC | Broken Arrow, OK | Southwest Power Pool (SWPP) | 5.1 TWh | Jun 2002 | Sep 2025 | Natural Gas |
| Ouachita | Entergy Louisiana LLC | Sterlington, LA | Midcontinent Independent System Operator, Inc. (MISO) | 4.3 TWh | Jul 2002 | Sep 2025 | Natural Gas |
| Ontelaunee Energy Center | Ontelaunee Energy Center | Reading, PA | PJM Interconnection, LLC (PJM) | 4.1 TWh | Apr 2002 | Sep 2025 | Natural Gas |
| Osprey Energy Center Power Plant | Duke Energy Florida, LLC | Auburndale, FL | Tampa Electric Company (TEC) | 3.8 TWh | Apr 2004 | Sep 2025 | Natural Gas |
| Odyssey Energy Altura Cogen, LLC | Odyssey Operating Services | Channelview, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 3.7 TWh | Oct 1985 | Sep 2025 | Natural Gas |
| Ottumwa | Interstate Power and Light Co | Ottumwa, IA | Midcontinent Independent System Operator, Inc. (MISO) | 2.9 TWh | Apr 1981 | Sep 2025 | Subbituminous Coal : 99.7% |
| O W Sommers | City of San Antonio - (TX) | San Antonio, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 2.5 TWh | Mar 1972 | Dec 2024 | Natural Gas |
| Oyster Creek Unit VIII | Dow Chemical Company-Oyster Creek VIII | Freeport, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 2.3 TWh | Sep 1994 | Sep 2025 | Natural Gas : 99.8% |
| Oahe | USACE-Omaha | Pierre, SD | Southwest Power Pool (SWPP) | 2.2 TWh | Mar 1962 | Dec 2024 | Water |
| 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 |
| Orient Wind Farm | MidAmerican Energy Co | Orient, IA | Midcontinent Independent System Operator, Inc. (MISO) | 1.8 TWh | Nov 2018 | Sep 2025 | Wind |
| Ocean State Power | Ocean State Power Co | Harrisville, RI | ISO New England (ISNE) | 1.2 TWh | Nov 1990 | Dec 2024 | Natural Gas : 99.9% |
| Old 300 Solar Center, LLC | Old 300 Solar Center, LLC | Needville, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 984.2 GWh | Sep 2024 | Sep 2025 | Solar |
| Oxbow (OR) | Idaho Power Co | Oxbow, OR | Idaho Power Company (IPCO) | 965.3 GWh | Jun 1961 | Dec 2024 | Water |
| Ocean State Power II | Ocean State Power II | Harrisville, RI | ISO New England (ISNE) | 896.8 GWh | Sep 1991 | Dec 2024 | Natural Gas : 99.9% |
| O'Brien Wind | MidAmerican Energy Co | Primghar, IA | Midcontinent Independent System Operator, Inc. (MISO) | 875.9 GWh | Aug 2016 | Dec 2024 | Wind |
| Odell Wind Farm | Algonquin Power Co | Mountain Lake, MN | Midcontinent Independent System Operator, Inc. (MISO) | 773.1 GWh | Jun 2016 | Dec 2024 | Wind |
| Orlando Cogen LP | Florida Municipal Power Agency | Orlando, FL | Duke Energy Florida, Inc. (FPC) | 704.8 GWh | Aug 1993 | Dec 2024 | Natural Gas |
| Osborn Wind Energy | Osborn Wind Energy LLC | Stewartsville, MO | Southwest Power Pool (SWPP) | 680.9 GWh | Nov 2016 | Sep 2025 | Wind |
| Oso Grande Wind Farm | Tucson Electric Power Co | Maljamar, NM | Tucson Electric Power (TEPC) | 628.5 GWh | Apr 2021 | Sep 2025 | Wind |
| Oliver Wind IV | Oliver Wind IV, LLC | Hannover, ND | Southwest Power Pool (SWPP) | 604.8 GWh | Nov 2024 | Sep 2025 | Wind |
| Oberon II Solar Project | IP Oberon II, LLC | Desert Center, CA | California Independent System Operator (CISO) | 598.4 GWh | Aug 2023 | Sep 2025 | Solar |
| Oberon Solar Project | IP Oberon LLC | Desert Center, CA | California Independent System Operator (CISO) | 581.0 GWh | Aug 2023 | Sep 2025 | Solar |
| Oxbow Solar 1 | Lightsource Renewable Energy Asset Management, LLC | New Roads, LA | Midcontinent Independent System Operator, Inc. (MISO) | 571.8 GWh | Jun 2024 | Sep 2025 | Solar |
| Old Trail Wind Farm | Old Trail Wind Farm LLC | Ellsworth, IL | PJM Interconnection, LLC (PJM) | 565.4 GWh | Nov 2007 | Sep 2025 | Wind |
| Orion III Solar Project | Ben Milam Solar 3 LLC | Buckholts, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 558.6 GWh | Jul 2024 | Sep 2025 | Solar |
| Orion II Solar Project | Ben Milam Solar 2 LLC | Rosebud, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 556.1 GWh | Aug 2024 | Sep 2025 | Solar |
| Osage Wind, LLC | Enel Green Power NA, Inc. | Burbank, OK | Associated Electric Cooperative, Inc. (AECI) | 549.0 GWh | May 2015 | Dec 2024 | Wind |
| Old Settler Wind | Old Settler Wind, LLC | Floydada, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 539.5 GWh | Mar 2017 | Sep 2025 | Wind |
| Origin Wind | Enel Green Power NA, Inc. | Hennepin, OK | Southwest Power Pool (SWPP) | 514.3 GWh | Oct 2014 | Dec 2024 | Wind |
| Osage Dam | Union Electric Co - (MO) | Eldon, MO | Midcontinent Independent System Operator, Inc. (MISO) | 497.1 GWh | Sep 1931 | Dec 2024 | Water |
| Oleander Power Project LP | Oleander Holdings LLC | Cocoa, FL | Florida Power & Light Co. (FPL) | 488.9 GWh | May 2002 | Dec 2024 | Natural Gas : 99.9% |
| Oxnard | Procter&Gamble Paper Products Co-Oxnard | Oxnard, CA | California Independent System Operator (CISO) | 479.4 GWh | Jun 1982 | Sep 2025 | Natural Gas |
| Ocotillo | Arizona Public Service Co | Tempe, AZ | Arizona Public Service Company (AZPS) | 473.2 GWh | Feb 1960 | Sep 2025 | Natural Gas |
| Ocotillo Express LLC | Pattern Operators LP | Ocotillo, CA | California Independent System Operator (CISO) | 461.7 GWh | Nov 2012 | Sep 2025 | Wind |
| Orion I Solar Project | Ben Milam Solar 1 LLC | Burlington, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 452.7 GWh | Jul 2024 | Sep 2025 | Solar |
| Otter Creek Wind Farm LLC | Avangrid Power LLC | Ransom, IL | PJM Interconnection, LLC (PJM) | 446.2 GWh | Feb 2020 | Sep 2025 | Wind |
| Old Hickory | USCE-Nashville District | Hendersonville, TN | Tennessee Valley Authority (TVA) | 436.6 GWh | Mar 1957 | Dec 2024 | Water |
| Oak Ridge Solar | AES Clean Energy | Oak Ridge, LA | Midcontinent Independent System Operator, Inc. (MISO) | 422.4 GWh | Nov 2023 | Sep 2025 | Solar |
| Orange Cogeneration Facility | Northern Star Generation Services Co LLC | Bartow, FL | Duke Energy Florida, Inc. (FPC) | 387.5 GWh | Jan 1995 | Dec 2024 | Natural Gas |
| Osceola Windpower LLC | Osceola Windpower LLC | Harris, IA | Southwest Power Pool (SWPP) | 386.7 GWh | Jun 2008 | Sep 2025 | Wind |
| Oliver Wind III, LLC | Oliver Wind III, LLC | Mandan, ND | Midcontinent Independent System Operator, Inc. (MISO) | 380.9 GWh | Dec 2016 | Sep 2025 | Wind |
| Oakfield Wind Project | Onward Energy | City of Oakfield, ME | ISO New England (ISNE) | 367.0 GWh | Sep 2015 | Sep 2025 | Wind |
| Ozark | USCE-Little Rock District | Ozark, AR | Southwestern Power Administration (SPA) | 314.7 GWh | Oct 1972 | Dec 2024 | Water |
| Oberon IA | Oberon Solar IA | Odessa, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 306.3 GWh | Jun 2020 | Sep 2025 | Solar |
| Oak Solar | Oak Solar LLC | Gaston, NC | PJM Interconnection, LLC (PJM) | 259.8 GWh | Nov 2023 | Sep 2025 | Solar |
| Onion River | Wisconsin Power & Light Co | Sheboygan Cedar Grove, WI | Midcontinent Independent System Operator, Inc. (MISO) | 252.6 GWh | Nov 2023 | Sep 2025 | Solar |
| OCI Alamo 7 LLC | Consolidated Edison Development Inc. | Haskell, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 245.3 GWh | Jul 2016 | 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 Trail Solar, LLC | Leeward Asset Management, LLC | Moyock, NC | PJM Interconnection, LLC (PJM) | 238.0 GWh | Jun 2023 | Sep 2025 | Solar |
| Ohio Falls | Louisville Gas & Electric Co | Shippingport Island, KY | Louisville Gas and Electric Company and Kentucky Utilities Company (LGEE) | 235.5 GWh | Dec 1927 | Dec 2024 | Water |
| Onondaga County Resource Recovery | Covanta Onondega LP | Jamesville, NY | New York Independent System Operator (NYIS) | 206.3 GWh | Oct 1994 | Sep 2025 | Non-biogenic Municipal Solid Waste : 54.5% Biogenic Municipal Solid Waste : 44.6% Natural Gas : 0.9% |
| Osceola Windpower II | Osceola Windpower II | Harris, IA | Midcontinent Independent System Operator, Inc. (MISO) | 196.9 GWh | Aug 2008 | Sep 2025 | Wind |
| OCI Alamo 5 LLC | Consolidated Edison Development Inc. | Uvalde, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 186.4 GWh | Nov 2015 | Dec 2024 | Solar |
| Otsego Mill Power Plant | Otsego Paper Inc | Otsego, MI | Midcontinent Independent System Operator, Inc. (MISO) | 165.5 GWh | Oct 1995 | Dec 2024 | Natural Gas |
| OETN1 | OE_TN1 | Obion, TN | Tennessee Valley Authority (TVA) | 164.0 GWh | Feb 2023 | Sep 2025 | Solar |
| Orchard | Florida Power & Light Co | Ft. Pierce, FL | Florida Power & Light Co. (FPL) | 157.5 GWh | Dec 2023 | Sep 2025 | Solar |
| Ocoee 3 | Tennessee Valley Authority | Benton, TN | Tennessee Valley Authority (TVA) | 151.7 GWh | Mar 1943 | Dec 2024 | Water |
| Oak Grove | Portland General Electric Co | Estacada, OR | Portland General Electric Company (PGE) | 150.1 GWh | Jul 1924 | Dec 2024 | Water |
| Orange Blossom Solar Center | Florida Power & Light Co | Vero Beach, FL | Florida Power & Light Co. (FPL) | 147.7 GWh | Apr 2021 | Sep 2025 | Solar |
| Okeechobee Solar | Florida Power & Light Co | Vero Beach, FL | Florida Power & Light Co. (FPL) | 146.2 GWh | Mar 2020 | Sep 2025 | Solar |
| Oklahoma Wind Energy Center | FPL Energy Oklahoma Wind LLC | Woodward, OK | Southwest Power Pool (SWPP) | 145.4 GWh | Sep 2003 | Dec 2024 | Wind |
| OREG 1 Inc | Ormat Nevada Inc | Culbertson, MT | Southwest Power Pool (SWPP) | 143.8 GWh | Jun 2006 | Sep 2025 | Waste Heat |
| OU Spirit Wind Farm | Oklahoma Gas & Electric Co | Woodward, OK | Southwest Power Pool (SWPP) | 136.4 GWh | Nov 2009 | Dec 2024 | Wind |
| Oxnard Paper Mill | New-Indy, Oxnard LLC | Oxnard, CA | California Independent System Operator (CISO) | 133.9 GWh | Feb 1986 | Sep 2025 | Natural Gas |
| Ormesa II | Ormat Nevada Inc | Holtville, CA | Imperial Irrigation District (IID) | 131.7 GWh | Apr 1989 | Dec 2024 | Geothermal |
| Otter Creek Solar | Dominion Energy Inc. | Chase City, VA | PJM Interconnection, LLC (PJM) | 131.2 GWh | Sep 2023 | Sep 2025 | Solar |
| Oliver Dam | Georgia Power Co | Columbus, GA | Southern Company Services, Inc. - Trans (SOCO) | 128.4 GWh | Jun 1959 | Dec 2024 | Water |
| OE_GA3 | Onward Energy | Camilla, GA | Southern Company Services, Inc. - Trans (SOCO) | 126.6 GWh | Nov 2019 | Sep 2025 | Solar |
| Oak Glen Wind Farm | Minnesota Municipal Power Agny | Blooming Prairie, MN | Midcontinent Independent System Operator, Inc. (MISO) | 120.5 GWh | Oct 2011 | Dec 2024 | Wind |
| OREG 2 Inc | Ormat Nevada Inc | Culbertson, MT | Southwest Power Pool (SWPP) | 118.7 GWh | Nov 2008 | Sep 2025 | Waste Heat |
| Orange Grove | Orange Grove | Jim Wells, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 112.9 GWh | - | Sep 2025 | Solar |
| Ocotillo Wells | Conductive Power | Borrego Springs, CA | California Independent System Operator (CISO) | 108.6 GWh | Aug 2023 | Sep 2025 | Solar |
| Oak Point Cogen | Chevron Oronite Co LLC | Belle Chasse, LA | Midcontinent Independent System Operator, Inc. (MISO) | 99.2 GWh | Sep 1999 | Dec 2024 | Natural Gas |
| Oxford Dam | Duke Energy Carolinas, LLC | Conover, NC | Duke Energy Carolinas (DUK) | 91.9 GWh | Mar 1928 | Dec 2024 | Water |
| 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% |
| Ocoee 2 | Tennessee Valley Authority | Benton, TN | Tennessee Valley Authority (TVA) | 86.7 GWh | Sep 1913 | Dec 2024 | Water |
| OCI Alamo Solar I Hybrid | OCI Energy LLC | San Antonio, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 84.0 GWh | Nov 2013 | Dec 2024 | Solar |
| OE_AZ1 | Onward Energy | Salome, AZ | Western Area Power Administration - Desert Southwest Region (WALC) | 83.2 GWh | Nov 2019 | Sep 2025 | Solar |
| Ocotillo Windpower | Duke Energy Renewables Services | Forsan, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 80.9 GWh | Aug 2008 | Dec 2024 | Wind |
| 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 |
| Old Gold Energy Center, LLC | Old Gold Energy Center, LLC | Joice, IA | Midcontinent Independent System Operator, Inc. (MISO) | 78.4 GWh | Sep 2001 | Dec 2024 | Wind |
| OCI Alamo 4, LLC | Consolidated Edison Development Inc. | Brackettville, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 76.0 GWh | Jul 2014 | Dec 2024 | Solar |
| Ormesa I | Ormat Nevada Inc | Holtville, CA | Imperial Irrigation District (IID) | 70.2 GWh | Nov 1986 | Dec 2024 | Geothermal |
| Oak Tree Energy | Consolidated Edison Development Inc. | Clark, SD | Southwest Power Pool (SWPP) | 69.4 GWh | Nov 2014 | Dec 2024 | Wind |
| Ocoee 1 | Tennessee Valley Authority | Benton, TN | Tennessee Valley Authority (TVA) | 69.2 GWh | Dec 1911 | Dec 2024 | Water |
| Ontario LFGTE | Seneca Energy II | Stanley, NY | New York Independent System Operator (NYIS) | 68.5 GWh | Oct 2003 | Dec 2024 | Landfill Gas |
| Ocean County Landfill | NextEra Renewable Fuels, LLC | Manchester, NJ | PJM Interconnection, LLC (PJM) | 64.3 GWh | Jan 1997 | Dec 2024 | Landfill Gas |
| Oberon IB | Oberon Solar IB | Odessa, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 61.4 GWh | Jun 2020 | Sep 2025 | Solar |
| Osawatomie | Evergy Metro | Miami, KS | Southwest Power Pool (SWPP) | 58.8 GWh | May 2003 | Dec 2024 | Natural Gas |
| Oasis Alta | Terra-Gen Operating Co-Wind | Mojave, CA | California Independent System Operator (CISO) | 57.0 GWh | Mar 2021 | 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 |
| Ozark Beach | Empire District Electric Co | Forsyth, MO | Southwest Power Pool (SWPP) | 53.2 GWh | May 1931 | Dec 2024 | Water |
| Okeelanta Cogeneration | New Hope Power Company | South Bay, FL | Florida Power & Light Co. (FPL) | 51.4 GWh | Dec 1995 | Sep 2025 | Agricultural By-Products : 97.8% Natural Gas : 2.2% |
| Olmsted Waste Energy | Olmsted County Public Works | Rochester, MN | Midcontinent Independent System Operator, Inc. (MISO) | 46.7 GWh | Mar 1987 | Dec 2024 | Non-biogenic Municipal Solid Waste : 54.7% Biogenic Municipal Solid Waste : 44.7% Natural Gas : 0.5% |
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 |