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( Mark One ) Commission file number 1-32853 1-4928 1-15929 1-3382 1-3274 1-1232 1-3543 1-6196 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , D.C. 20549 FORM 10 - K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal period ended December 31 , 2020 or TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from_ Registrant , State of Incorporation or Organization , Address of Principal Executive Offices and Telephone Number $ DUKE ENERGY® DUKE ENERGY CORPORATION ( a Delaware corporation ) 550 South Tryon Street Charlotte , North Carolina 28202-1803 704-382-3853 DUKE ENERGY CAROLINAS , LLC to ( a North Carolina limited liability company ) 526 South Church Street Charlotte , North Carolina 28202-1803 704-382-3853 PROGRESS ENERGY , INC . ( a North Carolina corporation ) 410 South Wilmington Street Raleigh , North Carolina 27601-1748 704-382-3853 DUKE ENERGY PROGRESS , LLC ( a North Carolina limited liability company ) 410 South Wilmington Street Raleigh , North Carolina 27601-1748 704-382-3853 DUKE ENERGY FLORIDA , LLC ( a Florida limited liability company ) 299 First Avenue North St. Petersburg , Florida 33701 704-382-3853 DUKE ENERGY OHIO , INC . ( an Ohio corporation ) 139 East Fourth Street Cincinnati , Ohio 45202 704-382-3853 DUKE ENERGY INDIANA , LLC ( an Indiana limited liability company ) 1000 East Main Street Plainfield , Indiana 46168 704-382-3853 PIEDMONT NATURAL GAS COMPANY , INC . ( a North Carolina corporation ) 4720 Piedmont Row Drive Charlotte , North Carolina 28210 704-364-3120 SECURITIES REGISTERED PURSUANT TO SECTION 12 ( b ) OF THE ACT : Registrant Title of each class Trading symbols which registered Duke Energy Corporation Common Stock , $ 0.001 par value DUK New York Stock Exchange LLC ( Duke Energy ) IRS Employer Identification No. 20-2777218 56-0205520 56-2155481 56-0165465 59-0247770 31-0240030 35-0594457 56-0556998 Name of each exchange on