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) | 22.4 TWh | Jun 1973 | Nov 2025 | Nuclear |
| Okeechobee Clean Energy Center | Florida Power & Light Co | Okeechobee, FL | Florida Power & Light Co. (FPL) | 11.9 TWh | Feb 2019 | Nov 2025 | Natural Gas |
| Oak Grove (TX) | Luminant Generation Company LLC | Franklin, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 11.1 TWh | Mar 2010 | Nov 2025 | Lignite Coal : 98.9% Natural Gas : 1.1% |
| Odessa-Ector Power Plant | LaFrontera Holdings LLC | Odessa, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 7.9 TWh | Jun 2001 | Nov 2025 | Natural Gas |
| Oregon Clean Energy Center | Oregon Clean Energy Center | Oregon, OH | PJM Interconnection, LLC (PJM) | 5.7 TWh | Jun 2017 | Nov 2025 | Natural Gas |
| Oneta Energy Center | Oneta Power LLC | Broken Arrow, OK | Southwest Power Pool (SWPP) | 5.0 TWh | Jun 2002 | Nov 2025 | Natural Gas |
| Ouachita | Entergy Louisiana LLC | Sterlington, LA | Midcontinent Independent System Operator, Inc. (MISO) | 4.3 TWh | Jul 2002 | Nov 2025 | Natural Gas |
| Ontelaunee Energy Center | Ontelaunee Energy Center | Reading, PA | PJM Interconnection, LLC (PJM) | 4.1 TWh | Apr 2002 | Nov 2025 | Natural Gas |
| Osprey Energy Center Power Plant | Duke Energy Florida, LLC | Auburndale, FL | Tampa Electric Company (TEC) | 3.7 TWh | Apr 2004 | Nov 2025 | Natural Gas |
| Odyssey Energy Altura Cogen, LLC | Odyssey Operating Services | Channelview, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 3.6 TWh | Oct 1985 | Oct 2025 | Natural Gas |
| Ottumwa | Interstate Power and Light Co | Ottumwa, IA | Midcontinent Independent System Operator, Inc. (MISO) | 3.0 TWh | Apr 1981 | Nov 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) | 2.5 TWh | Sep 1994 | Nov 2025 | Natural Gas : 99.8% |
| Oahe | USACE-Omaha | Pierre, SD | Southwest Power Pool (SWPP) | 2.2 TWh | Mar 1962 | Dec 2024 | Water |
| Orient Wind Farm | MidAmerican Energy Co | Orient, IA | Midcontinent Independent System Operator, Inc. (MISO) | 1.8 TWh | Nov 2018 | Nov 2025 | Wind |
| Otay Mesa Generating Project | Otay Mesa Energy Center LLC | San Diego, CA | California Independent System Operator (CISO) | 1.6 TWh | Sep 2009 | Nov 2025 | Natural Gas |
| Ocean State Power | Ocean State Power Co | Harrisville, RI | ISO New England (ISNE) | 1.2 TWh | Nov 1990 | Dec 2024 | Natural Gas : 99.9% |
| Oxbow (OR) | Idaho Power Co | Oxbow, OR | Idaho Power Company (IPCO) | 965.3 GWh | Jun 1961 | Dec 2024 | Water |
| Old 300 Solar Center, LLC | Old 300 Solar Center, LLC | Needville, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 931.5 GWh | Sep 2024 | Nov 2025 | Solar |
| 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 |
| Oliver Wind IV | Oliver Wind IV, LLC | Hannover, ND | Southwest Power Pool (SWPP) | 757.2 GWh | Nov 2024 | Nov 2025 | 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) | 664.9 GWh | Nov 2016 | Nov 2025 | Wind |
| Oberon II Solar Project | IP Oberon II, LLC | Desert Center, CA | California Independent System Operator (CISO) | 594.6 GWh | Aug 2023 | Nov 2025 | Solar |
| Oberon Solar Project | IP Oberon LLC | Desert Center, CA | California Independent System Operator (CISO) | 586.6 GWh | Aug 2023 | Nov 2025 | Solar |
| Oso Grande Wind Farm | Tucson Electric Power Co | Maljamar, NM | Tucson Electric Power (TEPC) | 566.9 GWh | Apr 2021 | Nov 2025 | Wind |
| Oxbow Solar 1 | Lightsource Renewable Energy Asset Management, LLC | New Roads, LA | Midcontinent Independent System Operator, Inc. (MISO) | 561.7 GWh | Jun 2024 | Nov 2025 | Solar |
| Old Trail Wind Farm | Old Trail Wind Farm LLC | Ellsworth, IL | PJM Interconnection, LLC (PJM) | 556.0 GWh | Nov 2007 | Nov 2025 | Wind |
| Orion III Solar Project | Ben Milam Solar 3 LLC | Buckholts, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 554.6 GWh | Jul 2024 | Nov 2025 | Solar |
| Orion II Solar Project | Ben Milam Solar 2 LLC | Rosebud, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 553.8 GWh | Aug 2024 | Nov 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) | 531.4 GWh | Mar 2017 | Nov 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) | 482.5 GWh | Jun 1982 | Nov 2025 | Natural Gas |
| Orion I Solar Project | Ben Milam Solar 1 LLC | Burlington, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 448.7 GWh | Jul 2024 | Nov 2025 | Solar |
| Otter Creek Wind Farm LLC | Avangrid Power LLC | Ransom, IL | PJM Interconnection, LLC (PJM) | 444.8 GWh | Feb 2020 | Nov 2025 | Wind |
| Ocotillo Express LLC | Pattern Operators LP | Ocotillo, CA | California Independent System Operator (CISO) | 438.4 GWh | Nov 2012 | Nov 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) | 412.0 GWh | Nov 2023 | Nov 2025 | Solar |
| Ocotillo | Arizona Public Service Co | Tempe, AZ | Arizona Public Service Company (AZPS) | 397.9 GWh | Feb 1960 | Nov 2025 | Natural Gas |
| 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) | 386.1 GWh | Jun 2008 | Nov 2025 | Wind |
| Oliver Wind III, LLC | Oliver Wind III, LLC | Mandan, ND | Midcontinent Independent System Operator, Inc. (MISO) | 382.4 GWh | Dec 2016 | Nov 2025 | Wind |
| Oakfield Wind Project | Onward Energy | City of Oakfield, ME | ISO New England (ISNE) | 354.4 GWh | Sep 2015 | Nov 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) | 306.8 GWh | Jun 2020 | Nov 2025 | Solar |
| Oak Solar | Oak Solar LLC | Gaston, NC | PJM Interconnection, LLC (PJM) | 257.7 GWh | Nov 2023 | Nov 2025 | Solar |
| Onion River | Wisconsin Power & Light Co | Sheboygan Cedar Grove, WI | Midcontinent Independent System Operator, Inc. (MISO) | 254.5 GWh | Nov 2023 | Nov 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) | 236.6 GWh | Jun 2023 | Nov 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 |
| Osceola Windpower II | Osceola Windpower II | Harris, IA | Midcontinent Independent System Operator, Inc. (MISO) | 196.8 GWh | Aug 2008 | Nov 2025 | Wind |
| Onondaga County Resource Recovery | Covanta Onondega LP | Jamesville, NY | New York Independent System Operator (NYIS) | 189.0 GWh | Oct 1994 | Nov 2025 | Non-biogenic Municipal Solid Waste : 54.4% Biogenic Municipal Solid Waste : 44.5% Natural Gas : 1.1% |
| 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) | 162.0 GWh | Feb 2023 | Nov 2025 | Solar |
| Orchard | Florida Power & Light Co | Ft. Pierce, FL | Florida Power & Light Co. (FPL) | 157.7 GWh | Dec 2023 | Nov 2025 | Solar |
| Orange Grove | Orange Grove | Jim Wells, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 155.8 GWh | - | Nov 2025 | Solar |
| Ocoee 3 | Tennessee Valley Authority | Benton, TN | Tennessee Valley Authority (TVA) | 151.7 GWh | Mar 1943 | Dec 2024 | Water |
| Orange Blossom Solar Center | Florida Power & Light Co | Vero Beach, FL | Florida Power & Light Co. (FPL) | 150.3 GWh | Apr 2021 | Nov 2025 | Solar |
| Oak Grove | Portland General Electric Co | Estacada, OR | Portland General Electric Company (PGE) | 150.1 GWh | Jul 1924 | Dec 2024 | Water |
| Okeechobee Solar | Florida Power & Light Co | Vero Beach, FL | Florida Power & Light Co. (FPL) | 148.1 GWh | Mar 2020 | Nov 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) | 138.3 GWh | Jun 2006 | Nov 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 | Nov 2025 | Natural Gas |
| Ormesa II | Ormat Nevada Inc | Holtville, CA | Imperial Irrigation District (IID) | 131.7 GWh | Apr 1989 | Dec 2024 | Geothermal |
| Oliver Dam | Georgia Power Co | Columbus, GA | Southern Company Services, Inc. - Trans (SOCO) | 128.4 GWh | Jun 1959 | Dec 2024 | Water |
| Otter Creek Solar | Dominion Energy Inc. | Chase City, VA | PJM Interconnection, LLC (PJM) | 128.3 GWh | Sep 2023 | Nov 2025 | Solar |
| OREG 2 Inc | Ormat Nevada Inc | Culbertson, MT | Southwest Power Pool (SWPP) | 125.4 GWh | Nov 2008 | Nov 2025 | Waste Heat |
| OE_GA3 | Onward Energy | Camilla, GA | Southern Company Services, Inc. - Trans (SOCO) | 125.1 GWh | Nov 2019 | Nov 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 |
| Ocotillo Wells | Conductive Power | Borrego Springs, CA | California Independent System Operator (CISO) | 108.8 GWh | Aug 2023 | Nov 2025 | Solar |
| Oriana Solar LLC | Oriana Solar LLC | Victoria, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 101.1 GWh | - | Nov 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) | 80.9 GWh | Nov 2019 | Nov 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) | 79.4 GWh | Nov 1985 | Nov 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) | 62.6 GWh | Jun 2020 | Nov 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 |
| Okeelanta Cogeneration | New Hope Power Company | South Bay, FL | Florida Power & Light Co. (FPL) | 54.7 GWh | Dec 1995 | Nov 2025 | Agricultural By-Products : 97.8% Natural Gas : 2.2% |
| 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 |
Summary of Power Plants By State
Figures are based on November 2025 generation numbers.| State | Rank | Active Plants | Nov 2025 Generation |
|---|---|---|---|
| Alabama | # 7 | 76 | 11,511.20 GWh |
| Alaska | # 48 | 144 | 528.08 GWh |
| Arizona | # 13 | 184 | 8,245.57 GWh |
| Arkansas | # 24 | 116 | 5,216.59 GWh |
| California | # 4 | 1,736 | 15,288.71 GWh |
| Colorado | # 29 | 302 | 4,252.83 GWh |
| Connecticut | # 34 | 166 | 3,697.17 GWh |
| Delaware | # 49 | 33 | 425.33 GWh |
| District of Columbia | # 51 | 16 | 14.43 GWh |
| Florida | # 2 | 323 | 18,667.27 GWh |
| Georgia | # 8 | 262 | 11,183.00 GWh |
| Hawaii | # 47 | 73 | 801.36 GWh |
| Idaho | # 43 | 146 | 1,663.41 GWh |
| Illinois | # 5 | 384 | 14,942.91 GWh |
| Indiana | # 15 | 211 | 7,722.21 GWh |
| Iowa | # 19 | 293 | 6,283.14 GWh |
| Kansas | # 32 | 187 | 4,136.03 GWh |
| Kentucky | # 21 | 60 | 5,370.35 GWh |
| Louisiana | # 12 | 86 | 8,259.66 GWh |
| Maine | # 45 | 216 | 1,300.62 GWh |
| Maryland | # 40 | 203 | 2,568.19 GWh |
| Massachusetts | # 41 | 648 | 1,975.71 GWh |
| Michigan | # 9 | 273 | 10,785.64 GWh |
| Minnesota | # 28 | 765 | 4,723.22 GWh |
| Mississippi | # 23 | 57 | 5,274.88 GWh |
| Missouri | # 22 | 128 | 5,368.91 GWh |
| State | Rank | Active Plants | Nov 2025 Generation |
|---|---|---|---|
| Montana | # 39 | 71 | 2,609.34 GWh |
| Nebraska | # 35 | 129 | 3,447.15 GWh |
| Nevada | # 38 | 114 | 3,066.88 GWh |
| New Hampshire | # 44 | 60 | 1,466.90 GWh |
| New Jersey | # 27 | 393 | 4,952.95 GWh |
| New Mexico | # 36 | 144 | 3,313.38 GWh |
| New York | # 10 | 956 | 10,414.21 GWh |
| North Carolina | # 11 | 909 | 9,927.17 GWh |
| North Dakota | # 33 | 61 | 3,714.56 GWh |
| Ohio | # 6 | 198 | 11,688.48 GWh |
| Oklahoma | # 18 | 143 | 6,525.64 GWh |
| Oregon | # 20 | 275 | 5,407.05 GWh |
| Pennsylvania | # 3 | 256 | 17,277.29 GWh |
| Rhode Island | # 46 | 100 | 833.56 GWh |
| South Carolina | # 16 | 208 | 7,560.03 GWh |
| South Dakota | # 42 | 52 | 1,785.37 GWh |
| Tennessee | # 26 | 88 | 5,030.87 GWh |
| Texas | # 1 | 955 | 43,514.30 GWh |
| Utah | # 37 | 125 | 3,174.08 GWh |
| Vermont | # 50 | 117 | 164.43 GWh |
| Virginia | # 17 | 239 | 7,087.47 GWh |
| Washington | # 14 | 137 | 7,966.23 GWh |
| West Virginia | # 31 | 39 | 4,211.99 GWh |
| Wisconsin | # 25 | 250 | 5,195.24 GWh |
| Wyoming | # 30 | 71 | 4,237.64 GWh |