Directory of Power Plants in the United States
| Plant Name | Utility | Location | Balancing Authority | Annual Generation | Plant Date | Last Update | Fuel Types |
|---|---|---|---|---|---|---|---|
| Osage (IA) | City of Osage - (IA) | Osage, IA | Midcontinent Independent System Operator, Inc. (MISO) | 5.5 GWh | Aug 1963 | Dec 2025 | Wind : 81.8% Solar : 18.2% |
| OU Spirit Wind Farm | Oklahoma Gas & Electric Co | Woodward, OK | Southwest Power Pool (SWPP) | 127.1 GWh | Nov 2009 | Dec 2025 | Wind |
| Optimum Wind 3 LLC | Novis Renewables, LLC | Nevada, IA | Midcontinent Independent System Operator, Inc. (MISO) | 7.4 GWh | Feb 2017 | Dec 2025 | Wind |
| Optimum Wind 4 LLC | Novis Renewables, LLC | Nevada, IA | Midcontinent Independent System Operator, Inc. (MISO) | 8.2 GWh | Feb 2017 | Dec 2025 | Wind |
| Optimum Wind 5 LLC | Novis Renewables, LLC | Nevada, IA | Midcontinent Independent System Operator, Inc. (MISO) | 8.7 GWh | Feb 2017 | Dec 2025 | Wind |
| Optimum Wind 6 LLC | Novis Renewables, LLC | Nevada, IA | Midcontinent Independent System Operator, Inc. (MISO) | 9.5 GWh | Feb 2017 | Dec 2025 | Wind |
| Optimum Wind 7 LLC | Novis Renewables, LLC | Nevada, IA | Midcontinent Independent System Operator, Inc. (MISO) | 9.2 GWh | Feb 2017 | Dec 2025 | Wind |
| Osage Wind, LLC | Enel Green Power NA, Inc. | Burbank, OK | Associated Electric Cooperative, Inc. (AECI) | 480.3 GWh | May 2015 | Dec 2025 | Wind |
| Osborn Wind Energy | Osborn Wind Energy LLC | Stewartsville, MO | Southwest Power Pool (SWPP) | 694.6 GWh | Nov 2016 | Aug 2026 | Wind |
| Oliver Wind IV | Oliver Wind IV, LLC | Hannover, ND | Southwest Power Pool (SWPP) | 819.2 GWh | Nov 2024 | Aug 2026 | Wind |
| Oliver Wind III, LLC | Oliver Wind III, LLC | Mandan, ND | Midcontinent Independent System Operator, Inc. (MISO) | 383.2 GWh | Dec 2016 | Aug 2026 | Wind |
| Orchard Windfarm 4, LLC | Orchard Windfarm, LLC | Lexington, OR | PacifiCorp West (PACW) | 17.3 GWh | Nov 2020 | Dec 2025 | Wind |
| Osceola Windpower II | Osceola Windpower II | Harris, IA | Midcontinent Independent System Operator, Inc. (MISO) | 191.6 GWh | Aug 2008 | Aug 2026 | Wind |
| Osceola Windpower LLC | Osceola Windpower LLC | Harris, IA | Southwest Power Pool (SWPP) | 386.2 GWh | Jun 2008 | Aug 2026 | Wind |
| Otter Creek Wind Farm LLC | Avangrid Power LLC | Ransom, IL | PJM Interconnection, LLC (PJM) | 457.7 GWh | Feb 2020 | Aug 2026 | Wind |
| Oso Grande Wind Farm | Tucson Electric Power Co | Maljamar, NM | Tucson Electric Power (TEPC) | 592.7 GWh | Apr 2021 | Aug 2026 | Wind |
| Oak Tree Energy | RWE Clean Energy | Clark, SD | Southwest Power Pool (SWPP) | 65.8 GWh | Nov 2014 | Dec 2025 | Wind |
| Old Settler Wind | Old Settler Wind, LLC | Floydada, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 585.1 GWh | Mar 2017 | Aug 2026 | Wind |
| Old Trail Wind Farm | Old Trail Wind Farm LLC | Ellsworth, IL | PJM Interconnection, LLC (PJM) | 569.1 GWh | Nov 2007 | Aug 2026 | Wind |
| Oakfield Wind Project | Onward Energy | City of Oakfield, ME | ISO New England (ISNE) | 328.7 GWh | Sep 2015 | Aug 2026 | Wind |
| Oasis Wind | Terra-Gen Operating Co-Wind | Mojave, CA | California Independent System Operator (CISO) | 221.1 GWh | Nov 2004 | Dec 2025 | Wind |
| Oasis Alta | Terra-Gen Operating Co-Wind | Mojave, CA | California Independent System Operator (CISO) | 49.3 GWh | Mar 2021 | Dec 2025 | Wind |
| Ocotillo Express LLC | Pattern Operators LP | Ocotillo, CA | California Independent System Operator (CISO) | 424.6 GWh | Nov 2012 | Aug 2026 | Wind |
| Orient Wind Farm | MidAmerican Energy Co | Orient, IA | Midcontinent Independent System Operator, Inc. (MISO) | 1.8 TWh | Nov 2018 | Aug 2026 | Wind |
| Origin Wind | Origin Wind Energy LLC | Hennepin, OK | Southwest Power Pool (SWPP) | 295.7 GWh | Oct 2014 | Dec 2025 | Wind |
| Oak Glen Wind Farm | Minnesota Municipal Power Agny | Blooming Prairie, MN | Midcontinent Independent System Operator, Inc. (MISO) | 101.9 GWh | Oct 2011 | Dec 2025 | Wind |
| Odin Wind Farm LLC | Aspenall Energies (Delaware), LLC | Mountainlake, MN | Midcontinent Independent System Operator, Inc. (MISO) | 32.4 GWh | Apr 2008 | Dec 2025 | Wind |
| Oak Creek Energy Systems I | Terra-Gen Operating Co-Wind | Mojave, CA | California Independent System Operator (CISO) | 57.3 GWh | May 1982 | Dec 2025 | Wind |
| Old Gold Energy Center, LLC | Old Gold Energy Center, LLC | Joice, IA | Midcontinent Independent System Operator, Inc. (MISO) | 57.1 GWh | Sep 2001 | Dec 2025 | Wind |
| Odell Wind Farm | Algonquin Power Co | Mountain Lake, MN | Midcontinent Independent System Operator, Inc. (MISO) | 768.5 GWh | Jun 2016 | Dec 2025 | Wind |
| Ocotillo Windpower | Deriva Energy | Forsan, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 79.4 GWh | Aug 2008 | Dec 2025 | Wind |
| O'Brien Wind | MidAmerican Energy Co | Primghar, IA | Midcontinent Independent System Operator, Inc. (MISO) | 851.2 GWh | Aug 2016 | Dec 2025 | Wind |
| Orchard Windfarm 3, LLC | Orchard Windfarm, LLC | Lexington, OR | Bonneville Power Administration (BPAT) | 17.0 GWh | Nov 2020 | Dec 2025 | Wind |
| Orchard Windfarm 1, LLC | Orchard Windfarm, LLC | Lexington, OR | PacifiCorp West (PACW) | 18.6 GWh | Nov 2020 | Dec 2025 | Wind |
| Orchard Windfarm 2, LLC | Orchard Windfarm, LLC | Lexington, OR | Bonneville Power Administration (BPAT) | 18.6 GWh | Nov 2020 | Dec 2025 | Wind |
| Oregon Trail Windfarm LLC | Echo 1 | Echo, OR | PacifiCorp West (PACW) | 22.3 GWh | May 2009 | Dec 2025 | Wind |
| Oregon Trail Wind Park | Idaho Wind Partners 1 LLC | Hagerman, ID | Idaho Power Company (IPCO) | 34.9 GWh | Dec 2010 | Dec 2025 | Wind |
| Oklahoma Wind Energy Center | FPL Energy Oklahoma Wind LLC | Woodward, OK | Southwest Power Pool (SWPP) | 140.6 GWh | Sep 2003 | Dec 2025 | Wind |
| Ozark Beach | Empire District Electric Co | Forsyth, MO | Southwest Power Pool (SWPP) | 40.3 GWh | May 1931 | Dec 2025 | Water |
| Ozark | USCE-Little Rock District | Ozark, AR | Southwestern Power Administration (SPA) | 279.6 GWh | Oct 1972 | Dec 2025 | Water |
| Otis Hydro | Eagle Creek Renewable Energy, LLC | Livermore Falls, ME | ISO New England (ISNE) | 40.3 GWh | Dec 1984 | Aug 2026 | Water |
| Oliver Dam | Georgia Power Co | Columbus, GA | Southern Company Services, Inc. - Trans (SOCO) | 120.3 GWh | Jun 1959 | Dec 2025 | Water |
| Ottauquechee Hydro | Green Mountain Power Corp | N. Hartland, VT | ISO New England (ISNE) | 2.8 GWh | Mar 1983 | Dec 2025 | Water |
| Oakdale | Northern Indiana Pub Serv Co | Monticello, IN | Midcontinent Independent System Operator, Inc. (MISO) | 15.0 GWh | Oct 1925 | Feb 2025 | Water |
| Oakdale Power Station | Massachusetts Water Res Auth | West Boylston, MA | ISO New England (ISNE) | 1.4 GWh | Apr 1951 | Dec 2025 | Water |
| Oconto Falls Lower | Eagle Creek Renewable Energy, LLC | Oconto Falls, WI | Midcontinent Independent System Operator, Inc. (MISO) | 6.0 GWh | Dec 1970 | Dec 2025 | Water |
| Ottumwa City of | City of Ottumwa - (IA) | Ottumwa, IA | Midcontinent Independent System Operator, Inc. (MISO) | 2.9 GWh | Jul 1931 | Dec 2025 | Water |
| Oahe | USACE-Omaha | Pierre, SD | Southwest Power Pool (SWPP) | 2.0 TWh | Mar 1962 | Dec 2025 | Water |
| Olsen | Olsen Power Partners | Whitmore, CA | California Independent System Operator (CISO) | 15.3 GWh | Dec 1989 | Dec 2025 | Water |
| Oak Grove | Portland General Electric Co | Estacada, OR | Portland General Electric Company (PGE) | 142.1 GWh | Jul 1924 | Dec 2025 | Water |
| Owyhee Dam Power Project | Owyhee Irrigation District | Nyssa, OR | Idaho Power Company (IPCO) | 28.2 GWh | Jul 1985 | Oct 2025 | Water |
| Oxbow (CA) | Placer County Water Agency - (CA) | Foresthill, CA | California Independent System Operator (CISO) | 23.2 GWh | Sep 1966 | Dec 2025 | Water |
| Oxbow (OR) | Idaho Power Co | Oxbow, OR | Idaho Power Company (IPCO) | 990.3 GWh | Jun 1961 | Dec 2025 | Water |
| Oneida | PacifiCorp | Riverdale, ID | PacifiCorp East (PACE) | 39.4 GWh | Jun 1915 | Dec 2025 | Water |
| Oxford Dam | Duke Energy Carolinas, LLC | Conover, NC | Duke Energy Carolinas (DUK) | 86.5 GWh | Mar 1928 | Dec 2025 | Water |
| Opal Springs Hydro | Deschutes Valley Water District | Culver, OR | PacifiCorp West (PACW) | 28.0 GWh | Dec 1984 | Dec 2025 | Water |
| Oconto Falls Upper | Eagle Creek Renewable Energy, LLC | Oconto Falls, WI | Midcontinent Independent System Operator, Inc. (MISO) | 6.0 GWh | Dec 1917 | Dec 2025 | Water |
| Old Hickory | USCE-Nashville District | Hendersonville, TN | Tennessee Valley Authority (TVA) | 324.7 GWh | Mar 1957 | Dec 2025 | Water |
| Orono Hydro Station | Brookfield Black Bear Hydro, LLC | Orono, ME | ISO New England (ISNE) | 6.2 GWh | Dec 2008 | Dec 2025 | Water |
| Osage Dam | Union Electric Co - (MO) | Eldon, MO | Midcontinent Independent System Operator, Inc. (MISO) | 498.9 GWh | Sep 1931 | Dec 2025 | Water |
| Ocoee 1 | Tennessee Valley Authority | Benton, TN | Tennessee Valley Authority (TVA) | 65.6 GWh | Dec 1911 | Dec 2025 | Water |
| Oswego Falls East | Erie Boulevard Hydropower LP | Fulton, NY | New York Independent System Operator (NYIS) | 22.2 GWh | Dec 1913 | Dec 2025 | Water |
| Oswego Falls West | Erie Boulevard Hydropower LP | Fulton, NY | New York Independent System Operator (NYIS) | 3.4 GWh | Dec 1913 | Dec 2025 | Water |
| Ohio Falls | Louisville Gas & Electric Co | Shippingport Island, KY | Louisville Gas and Electric Company and Kentucky Utilities Company (LGEE) | 219.5 GWh | Dec 1927 | Dec 2025 | Water |
| Oswegatchie | Erie Boulevard Hydropower LP | Edwards, NY | New York Independent System Operator (NYIS) | 7.0 GWh | Jul 2002 | Dec 2025 | Water |
| Orono B | Brookfield Black Bear Hydro, LLC | Orono, ME | ISO New England (ISNE) | 17.2 GWh | Oct 2013 | Dec 2025 | Water |
| Ocoee 2 | Tennessee Valley Authority | Benton, TN | Tennessee Valley Authority (TVA) | 98.1 GWh | Sep 1913 | Dec 2025 | Water |
| Ogdensburg | Ampersand Ogdensburg Hydro, LLC | Ogdensburg, NY | New York Independent System Operator (NYIS) | 4.4 GWh | Nov 1987 | Dec 2025 | Water |
| Ocoee 3 | Tennessee Valley Authority | Benton, TN | Tennessee Valley Authority (TVA) | 141.3 GWh | Mar 1943 | Dec 2025 | Water |
| Orchard Avenue 1 | Yakima-Tieton Irrigation Dist | Yakima, WA | PacifiCorp West (PACW) | 2.9 GWh | Feb 1987 | Oct 2025 | Water |
| OREG 1 Inc | Ormat Nevada Inc | Culbertson, MT | Southwest Power Pool (SWPP) | 127.7 GWh | Jun 2006 | Aug 2026 | Waste Heat |
| OREG 3 Inc | Ormat Nevada Inc | Trimont, MN | Midcontinent Independent System Operator, Inc. (MISO) | 43.0 GWh | Jul 2010 | Aug 2026 | Waste Heat |
| OREG 2 Inc | Ormat Nevada Inc | Culbertson, MT | Southwest Power Pool (SWPP) | 115.2 GWh | Nov 2008 | Aug 2026 | Waste Heat |
| Ottumwa | Interstate Power and Light Co | Ottumwa, IA | Midcontinent Independent System Operator, Inc. (MISO) | 3.5 TWh | Apr 1981 | Aug 2026 | Subbituminous Coal : 99.6% |
| Optimist | Origis Energy USA, Inc | West Point, MS | Tennessee Valley Authority (TVA) | 300.6 GWh | - | Aug 2026 | Solar : 99.8% |
| OR Solar 6, LLC | Heelstone Energy Holdings, LLC | Lakeview, OR | PacifiCorp West (PACW) | 22.2 GWh | Nov 2017 | Dec 2025 | Solar |
| Orange County Solar Farm (NY) | Tesla Inc. | Goshen, NY | ISO New England (ISNE) | 2.3 GWh | Apr 2017 | Dec 2025 | Solar |
| Orange Grove | Orange Grove | Jim Wells, TX | Electric Reliability Council of Texas, Inc. (ERCO) | 308.4 GWh | May 2025 | Aug 2026 | Solar |
| OR - Solops - SPI 18 - Clayfield | Clayfield Solar, LLC | Estacada, OR | Portland General Electric Company (PGE) | 3.2 GWh | Sep 2024 | Dec 2025 | Solar |
| OR - Green Key - Gun Club | Gun Club Solar, LLC | Dundee, OR | Portland General Electric Company (PGE) | 4.6 GWh | Nov 2024 | Dec 2025 | Solar |
| OR -Solops - SPI 18 - Cork | Cork Solar, LLC | Molalla, OR | Portland General Electric Company (PGE) | 2.4 GWh | Nov 2024 | Dec 2025 | Solar |
| Onyx - Brockton Thatcher Landfill Solar | Onyx Asset Services Group | Brockton, MA | ISO New England (ISNE) | 5.0 GWh | Oct 2017 | Dec 2025 | Solar |
| OR - Solops - SPI 18 - Belvedere | Belvedere Solar, LLC | Mount Angel, OR | Portland General Electric Company (PGE) | 5.2 GWh | Nov 2024 | Dec 2025 | Solar |
| OR Solar 8, LLC | Heelstone Energy Holdings, LLC | Dairy, OR | PacifiCorp West (PACW) | 20.0 GWh | Feb 2018 | Dec 2025 | Solar |
| OR Solar 2, LLC | OR Solar 2, LLC | Eagle Point, OR | PacifiCorp West (PACW) | 20.7 GWh | Sep 2020 | Dec 2025 | Solar |
| OR Solar 5, LLC | Heelstone Energy Holdings, LLC | Merrill, OR | PacifiCorp West (PACW) | 17.7 GWh | Dec 2017 | Dec 2025 | Solar |
| Oro Loma | RWE Clean Energy | Oro Loma, CA | California Independent System Operator (CISO) | 49.2 GWh | Dec 2016 | Dec 2025 | Solar |
| OR - Solops - SPI 18 - Dover | Dover Solar, LLC | Canby, OR | Portland General Electric Company (PGE) | 4.0 GWh | Nov 2024 | Dec 2025 | Solar |
| Orange PV | Terraform Arcadia | Orange, MA | ISO New England (ISNE) | 2.6 GWh | Jun 2013 | Dec 2025 | Solar |
| Orchard | Florida Power & Light Co | Ft. Pierce, FL | Florida Power & Light Co. (FPL) | 170.8 GWh | Dec 2023 | Aug 2026 | Solar |
| Onyx - Lamphear Road CSG | Onyx Asset Services Group | Rome, NY | New York Independent System Operator (NYIS) | 2.6 GWh | Sep 2016 | Dec 2025 | Solar |
| Orchard Knob | Orchard Knob Solar LLC | Dallas, OR | PacifiCorp West (PACW) | 993.0 MWh | Dec 2024 | Nov 2025 | Solar |
| Orchard Ranch Solar | Orchard Ranch Solar, LLC | Kuna, ID | Idaho Power Company (IPCO) | 44.6 GWh | Feb 2017 | Aug 2026 | Solar |
| Onyx - Allen Harim | Onyx Asset Services Group | Harbeson, DE | PJM Interconnection, LLC (PJM) | 1.7 GWh | Mar 2017 | Dec 2025 | Solar |
| Ontario Sun | Azimuth 180 Solar Electric, LLC | Sandy Creek, NY | New York Independent System Operator (NYIS) | 3.4 GWh | Jan 2023 | Dec 2025 | Solar |
| Ontario Solar Center | Adapture Renewables, Inc. | Ontario, OR | Idaho Power Company (IPCO) | 7.5 GWh | Apr 2020 | Dec 2025 | Solar |
| Ontario 2 CDG | NY CDG Ontario 2, LLC | Phelps, NY | New York Independent System Operator (NYIS) | 4.5 GWh | May 2025 | Dec 2025 | Solar |
| Open Sky Dairy | Renewable Solar, Inc | Riverdale, CA | California Independent System Operator (CISO) | 418.8 MWh | Jun 2024 | Dec 2025 | Solar |
| Onset East Community Solar Facility | Kearsarge Onset LLC | Wareham, MA | ISO New England (ISNE) | 1.6 GWh | Mar 2016 | Dec 2025 | Solar |
| Onset West Community Solar Facility | Kearsarge Onset LLC | Wareham, MA | ISO New England (ISNE) | 1.6 GWh | Mar 2016 | Dec 2025 | Solar |
Summary of Power Plants By State
Figures are based on August 2026 generation numbers.| State | Rank | Active Plants | Aug 2026 Generation |
|---|---|---|---|
| Alabama | # 9 | 80 | 13,897.78 GWh |
| Alaska | # 48 | 146 | 672.99 GWh |
| Arizona | # 10 | 203 | 13,589.64 GWh |
| Arkansas | # 23 | 122 | 7,027.75 GWh |
| California | # 3 | 1,840 | 24,164.86 GWh |
| Colorado | # 30 | 321 | 5,322.30 GWh |
| Connecticut | # 34 | 180 | 4,400.98 GWh |
| Delaware | # 49 | 35 | 555.40 GWh |
| District of Columbia | # 51 | 19 | 21.71 GWh |
| Florida | # 2 | 345 | 28,185.93 GWh |
| Georgia | # 6 | 261 | 15,282.60 GWh |
| Hawaii | # 47 | 73 | 863.62 GWh |
| Idaho | # 43 | 152 | 1,754.56 GWh |
| Illinois | # 5 | 556 | 18,683.36 GWh |
| Indiana | # 17 | 226 | 9,970.06 GWh |
| Iowa | # 27 | 301 | 5,759.64 GWh |
| Kansas | # 26 | 191 | 6,368.18 GWh |
| Kentucky | # 21 | 63 | 7,221.26 GWh |
| Louisiana | # 14 | 93 | 10,670.45 GWh |
| Maine | # 45 | 250 | 1,285.31 GWh |
| Maryland | # 37 | 236 | 3,745.22 GWh |
| Massachusetts | # 41 | 679 | 1,958.59 GWh |
| Michigan | # 12 | 288 | 12,064.19 GWh |
| Minnesota | # 32 | 794 | 5,047.38 GWh |
| Mississippi | # 19 | 62 | 8,358.70 GWh |
| Missouri | # 22 | 134 | 7,125.71 GWh |
| State | Rank | Active Plants | Aug 2026 Generation |
|---|---|---|---|
| Montana | # 40 | 72 | 2,266.60 GWh |
| Nebraska | # 39 | 132 | 3,448.00 GWh |
| Nevada | # 29 | 117 | 5,523.31 GWh |
| New Hampshire | # 42 | 60 | 1,901.10 GWh |
| New Jersey | # 25 | 409 | 6,440.88 GWh |
| New Mexico | # 33 | 166 | 4,571.47 GWh |
| New York | # 11 | 1,087 | 13,130.21 GWh |
| North Carolina | # 8 | 921 | 14,263.55 GWh |
| North Dakota | # 38 | 62 | 3,579.89 GWh |
| Ohio | # 7 | 216 | 14,448.49 GWh |
| Oklahoma | # 13 | 153 | 10,965.38 GWh |
| Oregon | # 31 | 292 | 5,257.14 GWh |
| Pennsylvania | # 4 | 270 | 23,772.83 GWh |
| Rhode Island | # 46 | 108 | 924.31 GWh |
| South Carolina | # 16 | 214 | 9,989.71 GWh |
| South Dakota | # 44 | 53 | 1,486.65 GWh |
| Tennessee | # 18 | 101 | 8,430.26 GWh |
| Texas | # 1 | 1,069 | 65,726.98 GWh |
| Utah | # 36 | 131 | 4,074.82 GWh |
| Vermont | # 50 | 118 | 175.56 GWh |
| Virginia | # 15 | 255 | 10,241.54 GWh |
| Washington | # 20 | 137 | 8,189.60 GWh |
| West Virginia | # 28 | 41 | 5,593.74 GWh |
| Wisconsin | # 24 | 272 | 6,683.19 GWh |
| Wyoming | # 35 | 71 | 4,322.19 GWh |