EXHIBIT 21
LIST OF SUBSIDIARIES
The following is a list of certain Duke Energy subsidiaries (50% owned or greater) and their respective states or countries of incorporation as of December 31, 2017:
| Advance SC LLC (South Carolina) |
| Baker House Apartments LLC (North Carolina) |
| Bethel Price Solar, LLC (Delaware) |
| Bison Insurance Company Limited (South Carolina) |
| Black Mountain Solar, LLC (Arizona) |
| Caldwell Power Company (North Carolina) |
| Capitan Corporation (Tennessee) |
| Caprock Solar 1 LLC (Delaware) |
| Caprock Solar 2 LLC (Delaware) |
| Caprock Solar Holdings 1, LLC (Delaware) |
| Caprock Solar Holdings 2, LLC (Delaware) |
| Carofund, Inc. (North Carolina) |
| CaroHome, LLC (North Carolina) |
| Catamount Energy Corporation (Vermont) |
| Catamount Rumford Corporation (Vermont) |
| Catamount Sweetwater 1 LLC (Vermont) |
| Catamount Sweetwater 2 LLC (Vermont) |
| Catamount Sweetwater 3 LLC (Vermont) |
| Catamount Sweetwater 4-5 LLC (Vermont) |
| Catamount Sweetwater 6 LLC (Vermont) |
| Catamount Sweetwater Corporation (Vermont) |
| Catamount Sweetwater Holdings LLC (Vermont) |
| Catawba Mfg. & Electric Power Co. (North Carolina) |
| CEC UK1 Holding Corp. (Vermont) |
| CEC UK2 Holding Corp. (Vermont) |
| Century Group Real Estate Holdings, LLC (South Carolina) |
| CGP Global Greece Holdings, SA (Greece) |
| Cimarron Windpower II, LLC (Delaware) |
| Cinergy Climate Change Investments, LLC (Delaware) |
| Cinergy Corp. (Delaware) |
| Cinergy Global (Cayman) Holdings, Inc. (Cayman Islands) |
| Cinergy Global Holdings, Inc. (Delaware) |
| Cinergy Global Power Africa (Proprietary) Limited (South Africa) |
| Cinergy Global Power, Inc. (Delaware) |
| Cinergy Global Resources, Inc. (Delaware) |
| Cinergy Global Tsavo Power (Cayman Islands) |
| Cinergy Receivables Company LLC (Delaware) |
| Cinergy Solutions - Utility, Inc. (Delaware) |
| Claiborne Energy Services, Inc. (Louisiana) |
| Clear Skies Solar Holdings, LLC (Delaware) |
| Clear Skies Solar, LLC (Delaware) |
| Colonial Eagle Solar, LLC (Delaware) |
| Conetoe II Solar, LLC (North Carolina) |
| Creswell Alligood Solar, LLC (Delaware) |
| CS Murphy Point, LLC (North Carolina) |
| CSCC Holdings Limited Partnership (Canada (British Columbia)) |
| CTE Petrochemicals Company (Cayman Islands) |
| D/FD Holdings, LLC (Delaware) |
| D/FD Operating Services LLC (Delaware) |
| DATC Midwest Holdings, LLC (Delaware) |
| DATC Path 15 Transmission, LLC (Delaware) |
| DATC Path 15, LLC (Delaware) |
| DE Nuclear Engineering, Inc. (North Carolina) |
| DEGS O&M, LLC (Delaware) |
| DEGS of Narrows, LLC (Delaware) |
| DEGS Wind Supply II, LLC (Delaware) |
| DEGS Wind Supply, LLC (Delaware) |
| DEPHCO Logistics, LLC (Delaware) |
| DETMI Management, Inc. (Colorado) |
| Dixilyn-Field (Nigeria) Limited (Nigeria) |
| Dixilyn-Field Drilling Company (Delaware) |
| Dogwood Solar, LLC (Delaware) |
| DS Cornerstone LLC (Delaware) |
| DTMSI Management Ltd. (British Columbia) |
| Duke Energy ACP, LLC (Delaware) |
| Duke Energy Americas, LLC (Delaware) |
| Duke Energy Arabian Limited (Gibraltar) |
| Duke Energy Beckjord Storage LLC (Delaware) |
| Duke Energy Beckjord, LLC (Delaware) |
| Duke Energy Brazil Holdings I, C.V. (Brazil) |
| Duke Energy Brazil Holdings II, C.V. (Brazil) |
| Duke Energy Business Services LLC (Delaware) |
| Duke Energy Carolinas Plant Operations, LLC (Delaware) |
| Duke Energy Carolinas, LLC (North Carolina) |
| Duke Energy China Corp. (Delaware) |
| Duke Energy Clean Energy Resources, LLC (Delaware) |
| Duke Energy Commercial Enterprises, Inc. (Indiana) |
| Duke Energy Corporate Services, Inc. (Delaware) |
| Duke Energy Florida Project Finance, LLC (Delaware) |
| Duke Energy Florida Receivables LLC (Delaware) |
| Duke Energy Florida Solar Solutions, LLC (Delaware) |
| Duke Energy Florida, LLC (Florida) |
| Duke Energy Generation Services, Inc. (Delaware) |
| Duke Energy Group Holdings, LLC (Delaware) |
| Duke Energy Group, LLC (Delaware) |
| Duke Energy Indiana, LLC (Indiana) |
| Duke Energy Industrial Sales, LLC (Delaware) |
| Duke Energy International (Europe) Holdings ApS (Denmark) |
| Duke Energy International Argentina Marketing/Trading (Bermuda) Ltd. (Bermuda) |
| Duke Energy International Asia Pacific Ltd. (Bermuda) |
| Duke Energy International Group, Ltd. (Bermuda) |
| Duke Energy International Holding S.à r.l. (Luxembourg) |
| Duke Energy International Latin America, Ltd. (Bermuda) |
| Duke Energy International Netherlands Financial Services B.V. (Netherlands) |
| Duke Energy International PJP Holdings, Ltd. (Bermuda) |
| Duke Energy International Uruguay Investments, S.R.L. (Uruguay) |
| Duke Energy International, LLC (Delaware) |
| Duke Energy Kentucky, Inc. (Kentucky) |
| Duke Energy Luxembourg I, S.à r.l. (Luxembourg) |
| Duke Energy Luxembourg II, S.à r.l. (Luxembourg) |
| Duke Energy Luxembourg III, S.à r.l. (Luxembourg) |
| Duke Energy Luxembourg IV, S.à r.l. (Luxembourg) |
| Duke Energy Merchants, LLC (Delaware) |
| Duke Energy North America, LLC (Delaware) |
| Duke Energy Ohio, Inc. (Ohio) |
| Duke Energy One, Inc. (Delaware) |
| Duke Energy Pipeline Holding Company, LLC (Delaware) |
| Duke Energy Progress Receivables LLC (Delaware) |
| Duke Energy Progress, LLC (North Carolina) |
| Duke Energy Receivables Finance Company, LLC (Delaware) |
| Duke Energy Registration Services, Inc. (Delaware) |
| Duke Energy Renewable Services, LLC (Delaware) |
| Duke Energy Renewables Commercial, LLC (Delaware) |
| Duke Energy Renewables Holding Company, LLC (Delaware) |
| Duke Energy Renewables NC Solar, LLC (Delaware) |
| Duke Energy Renewables Solar, LLC (Delaware) |
| Duke Energy Renewables Wind, LLC (Delaware) |
| Duke Energy Renewables, Inc. (Delaware) |
| Duke Energy Royal, LLC (Delaware) |
| Duke Energy Sabal Trail, LLC (Delaware) |
| Duke Energy SAM, LLC (Delaware) |
| Duke Energy Services Canada ULC (British Columbia) |
| Duke Energy Services, Inc. (Delaware) |
| Duke Energy Shoreham, LLC (Delaware) |
| Duke Energy Transmission Holding Company, LLC (Delaware) |
| Duke Energy Vermillion II, LLC (Delaware) |
| Duke Investments, LLC (Delaware) |
| Duke Project Services, Inc. (North Carolina) |
| Duke Supply Network, LLC (Delaware) |
| Duke Technologies, Inc. (Delaware) |
| Duke Ventures II, LLC (Delaware) |
| Duke Ventures Real Estate, LLC (Delaware) |
| Duke Ventures, LLC (Nevada) |
| Duke/Fluor Daniel (North Carolina) |
| Duke/Fluor Daniel Caribbean, S.E. (Puerto Rico) |
| Duke/Fluor Daniel El Salvador S.A. de C.V. (El Salvador) |
| Duke/Fluor Daniel International (Nevada) |
| Duke/Fluor Daniel International Services (Nevada) |
| Duke/Fluor Daniel International Services (Trinidad) Ltd. (Trinidad and Tobago) |
| Duke-American Transmission Company, LLC (Delaware) |
| Duke-Reliant Resources, Inc. (Delaware) |
| Eastman Whipstock do Brasil Ltda. (Brazil) |
| Eastman Whipstock, S.A. (Argentina) |
| Eastover Land Company (Kentucky) |
| Eastover Mining Company (Kentucky) |
| Emerald State Solar Holdings, LLC (Delaware) |
| Emerald State Solar, LLC (Delaware) |
| Energy Pipelines International Company (Delaware) |
| Equinox Vermont Corporation (Vermont) |
| Everetts Wildcat Solar, LLC (Delaware) |
| Florida Progress Funding Corporation (Delaware) |
| Florida Progress, LLC (Florida) |
| Free State Windpower, LLC (Delaware) |
| Fresh Air Energy X, LLC (North Carolina) |
| Frontier Windpower II, LLC (Delaware) |
| Frontier Windpower, LLC (Delaware) |
| Garysburg Solar LLC (Delaware) |
| Gaston Solar LLC (Delaware) |
| Gato Montes Solar, LLC (Delaware) |
| Green Frontier Windpower Holdings, LLC (Delaware) |
| Green Frontier Windpower, LLC (Delaware) |
| Greenville Gas and Electric Light and Power Company (South Carolina) |
| Grove Arcade Restoration LLC (North Carolina) |
| Happy Jack Windpower, LLC (Delaware) |
| Hardy Storage Company, LLC (West Virginia) |
| HGA Development, LLC (North Carolina) |
| High Noon Solar Holdings, LLC (Delaware) |
| High Noon Solar, LLC (Delaware) |
| Highlander Solar 1, LLC (Delaware) |
| Highlander Solar 2, LLC (Delaware) |
| Historic Property Management, LLC (North Carolina) |
| HXOap Solar One, LLC (North Carolina) |
| Ironwood Windpower, LLC (Delaware) |
| Ironwood-Cimarron Windpower Holdings, LLC (Delaware) |
| ISH Solar Grin, LLC (Delaware) |
| Kentucky May Coal Company, LLC (Virginia) |
| Kit Carson Windpower II Holdings, LLC (Delaware) |
| Kit Carson Windpower II, LLC (Delaware) |
| Kit Carson Windpower, LLC (Delaware) |
| KO Transmission Company (Kentucky) |
| Laurel Hill Wind Energy, LLC (Pennsylvania) |
| Long Farm 46 Solar, LLC (North Carolina) |
| Longboat Solar, LLC (Delaware) |
| Los Vientos Windpower IA Holdings, LLC (Delaware) |
| Los Vientos Windpower IA, LLC (Delaware) |
| Los Vientos Windpower IB Holdings, LLC (Delaware) |
| Los Vientos Windpower IB, LLC (Delaware) |
| Los Vientos Windpower III Holdings, LLC (Delaware) |
| Los Vientos Windpower III, LLC (Delaware) |
| Los Vientos Windpower IV Holdings, LLC (Delaware) |
| Los Vientos Windpower IV, LLC (Delaware) |
| Los Vientos Windpower V Holdings, LLC (Delaware) |
| Los Vientos Windpower V, LLC (Delaware) |
| Martins Creek Solar NC, LLC (North Carolina) |
| MCP, LLC (South Carolina) |
| Mesquite Creek Wind LLC (Delaware) |
| Miami Power Corporation (Indiana) |
| Murphy Farm Power, LLC (North Carolina) |
| National Methanol Company (IBN SINA) (Saudi Arabia) |
| Nemaha Windpower, LLC (Delaware) |
| North Allegheny Wind, LLC (Delaware) |
| North Carolina Renewable Properties, LLC (North Carolina) |
| NorthSouth Insurance Company Limited (South Carolina) |
| Notrees Windpower, LP (Delaware) |
| Ocotillo Windpower, LP (Delaware) |
| PanEnergy Corp. (Delaware) |
| Path 15 Funding KBT, LLC (Delaware) |
| Path 15 Funding TV, LLC (Delaware) |
| Path 15 Funding, LLC (Delaware) |
| Peak Tower, LLC (Delaware) |
| Phoenix Energy Technologies, Inc. (Delaware) |
| PHX Management Holdings, LLC (Delaware) |
| Piedmont ACP Company, LLC (North Carolina) |
| Piedmont Constitution Pipeline Company, LLC (North Carolina) |
| Piedmont ENCNG Company, LLC (North Carolina) |
| Piedmont Energy Company (North Carolina) |
| Piedmont Energy Partners, Inc. (North Carolina) |
| Piedmont Hardy Storage Company, LLC (North Carolina) |
| Piedmont Interstate Pipeline Company (North Carolina) |
| Piedmont Intrastate Pipeline Company (North Carolina) |
| Piedmont Natural Gas Company, Inc. (North Carolina) |
| PIH Tax Credit Fund III, Inc. (Florida) |
| PIH Tax Credit Fund IV, Inc. (Florida) |
| PIH Tax Credit Fund V, Inc. (Florida) |
| PIH, Inc. (Florida) |
| Pioneer Transmission, LLC (Indiana) |
| Powerhouse Square, LLC (North Carolina) |
| PRAIRIE, LLC (North Carolina) |
| Progress Capital Holdings, Inc. (Florida) |
| Progress Energy EnviroTree, Inc. (North Carolina) |
| Progress Energy, Inc. (North Carolina) |
| Progress Fuels, LLC (Delaware) |
| Progress Synfuel Holdings, Inc. (Delaware) |
| Progress Telecommunications Corporation (Florida) |
| PT Attachment Solutions, LLC (Delaware) |
| PT Holding Company LLC (Delaware) |
| Pumpjack Solar I, LLC (Delaware) |
| RE Ajo 1 LLC (Delaware) |
| RE AZ Holdings LLC (Delaware) |
| RE Bagdad Solar 1 LLC (Delaware) |
| RE SFCity1 GP, LLC (Delaware) |
| RE SFCity1 Holdco LLC (Delaware) |
| RE SFCity1, LP (Delaware) |
| REC Solar Commercial Corporation (Delaware) |
| Rio Bravo Solar I, LLC (Delaware) |
| Rio Bravo Solar II, LLC (Delaware) |
| River Road Solar, LLC (North Carolina) |
| RP-Orlando, LLC (Delaware) |
| Sandy River Timber, LLC (South Carolina) |
| Seaboard Solar LLC (Delaware) |
| Seahorse do Brasil Servicos Maritimos Ltda. (Brazil) |
| Seville Solar Holding Company, LLC (Delaware) |
| Seville Solar Investments One LLC (Delaware) |
| Seville Solar One LLC (Delaware) |
| Seville Solar Two, LLC (Delaware) |
| Shirley Wind, LLC (Wisconsin) |
| Shoreham Energy Holdings, LLC (Delaware) |
| Silver Sage Windpower, LLC (Delaware) |
| Solar Star North Carolina I, LLC (Delaware) |
| Solar Star North Carolina II, LLC (Delaware) |
| SolNCPower10, L.L.C. (North Carolina) |
| SolNCPower5, LLC (North Carolina) |
| SolNCPower6, LLC (North Carolina) |
| South Construction Company, Inc. (Indiana) |
| Southern Power Company (North Carolina) |
| Stenner Creek Solar LLC (Delaware) |
| Strategic Resource Solutions Corp., A North Carolina Enterprise Corporation (North Carolina) |
| Summit Wind Energy Mesquite Creek, LLC (Delaware) |
| Sweetwater Development LLC (Texas) |
| Sweetwater Wind 6 LLC (Delaware) |
| Sweetwater Wind Power L.L.C. (Texas) |
| Tarboro Solar LLC (Delaware) |
| Taylorsville Solar, LLC (Delaware) |
| TBP Properties, LLC (South Carolina) |
| TE Notrees, LLC (Delaware) |
| TE Ocotillo, LLC (Delaware) |
| Texas Eastern Arabian S.à r.l. (Luxembourg) |
| Texoma Wind Holdings, LLC (Delaware) |
| Texoma Wind, LLC (Delaware) |
| Three Buttes Windpower, LLC (Delaware) |
| Top of the World Wind Energy Holdings LLC (Delaware) |
| Top of the World Wind Energy LLC (Delaware) |
| TRES Timber, LLC (South Carolina) |
| Tri-State Improvement Company (Ohio) |
| TX Solar I LLC (Delaware) |
| Victory Solar LLC (Delaware) |
| Washington Airport Solar, LLC (Delaware) |
| Washington Millfield Solar, LLC (Delaware) |
| Washington White Post Solar, LLC (Delaware) |
| Wateree Power Company (South Carolina) |
| West Texas Angelos Holdings LLC (Delaware) |
| Western Carolina Power Company (North Carolina) |
| Wild Jack Solar Holdings LLC (Delaware) |
| Wild Jack Solar LLC (Delaware) |
| Wildwood Solar I, LLC (Delaware) |
| Wildwood Solar II, LLC (Delaware) |
| Wind Star Holdings, LLC (Delaware) |
| Wind Star Renewables, LLC (Delaware) |
| Windsor Cooper Hill Solar, LLC (Delaware) |
| Winton Solar LLC (Delaware) |
| WNC Institutional Tax Credit Fund, L.P. (California) |
| Woodland Solar LLC (Delaware) |
| Zephyr Power Transmission LLC (Delaware) |