| Cinergy Corporation | air pollution violation | 2000 | EPA | $1,430,000,000 |
| Duke Energy | environmental violation | 2021 | NC-AG | $855,000,000 |
| Duke Energy | price-fixing or anti-competitive practices | 2004 | MULTI-AG | $207,500,000 |
| Duke Energy Corporation | water pollution violation | 2015 | EPA | $102,000,000 |
| Duke Energy | air pollution violation | 2009 | EPA | $93,000,000 |
| Duke Energy | price-fixing or anti-competitive practices | 2016 | private lawsuit-federal | $80,875,000 |
| Progress Energy | False Claims Act and related | 2004 | CA-SFCA | $43,100,000 |
| Duke Energy Retirement Cash Balance Plan | benefit plan administrator violation | 2011 | private lawsuit-federal | $30,000,000 |
| Cinergy Corporation | air pollution violation | 2000 | MULTI-AG | (*)Penalty amounts marked by an asterisk are ones announced by more than one agency. Parent penalty totals are adjusted to avoid double-counting. $30,000,000 |
| Duke Energy Trading and Marketing, L.L.C. | price-fixing or anti-competitive practices | 2003 | CFTC | $28,000,000 |
| Duke Energy Progress | environmental violation | 2015 | NC-ENV | $25,116,883 |
| Duke Energy Trading and Marketing L.L.C. | price-fixing or anti-competitive practices | 2017 | private lawsuit-federal | $9,400,000 |
| Cinergy Corp. | environmental violation | 2000 | NY-AG | $8,500,000 |
| Duke Energy Carolinas, LLC | environmental violation | 2016 | NC-ENV | $6,831,005 |
| Progress Energy Inc. | energy market violation | 2005 | FERC | $6,400,000 |
| Duke Energy | air pollution violation | 2015 | EPA | $5,375,000 |
| Duke Energy Corporation | energy market violation | 2018 | FERC | $3,500,000 |
| Duke Energy Trading and Marketing L.L.C. | price-fixing or anti-competitive practices | 2009 | private lawsuit-federal | $3,466,667 |
| Duke Energy | environmental violation | 2014 | EPA | $3,000,000 |
| Duke Energy | price-fixing or anti-competitive practices | 2003 | FERC | $2,500,000 |
| DUKE ENERGY INDIANA, LLC - GALLAGHER GENERATING STATION | environmental violation | 2010 | EPA | (*)Penalty amounts marked by an asterisk are ones announced by more than one agency. Parent penalty totals are adjusted to avoid double-counting. $1,750,000 |
| Duke Energy Carolinas LLC | environmental violation | 2016 | USAO | $1,700,000 |
| Piedmont Natural Gas Co. Inc. | energy market violation | 2009 | FERC | $1,250,000 |
| Duke Energy Beckjord LLC | water pollution violation | 2016 | EPA | $1,100,000 |
| Duke Energy Renewables Inc. | environmental violation | 2013 | FWS | $1,000,000 |
| Duke Energy | air pollution violation | 2009 | MULTI-AG | (*)Penalty amounts marked by an asterisk are ones announced by more than one agency. Parent penalty totals are adjusted to avoid double-counting. $1,000,000 |
| DUKE ENERGY CORP. | environmental violation | 2015 | EPA | (*)Penalty amounts marked by an asterisk are ones announced by more than one agency. Parent penalty totals are adjusted to avoid double-counting. $975,000 |
| CINERGY AND PSI ENERGY, INC., WABASH RIVER | environmental violation | 2009 | EPA | $687,500 |
| Duke Energy Corporation | investor protection violation | 2017 | DOJ_ANTITRUST | $600,000 |
| Duke Energy Ohio Inc | utility safety violation | 2012 | OH-PUC | $500,000 |
| Duke Energy Carolinas, LLC | energy market violation | 2011 | FERC | $425,000 |
| DEGS of Narrows LLC | air pollution violation | 2010 | EPA | $310,000 |
| DEGS OF NARROWS, LLC | environmental violation | 2010 | EPA | (*)Penalty amounts marked by an asterisk are ones announced by more than one agency. Parent penalty totals are adjusted to avoid double-counting. $310,000 |
| CAROLINA POWER & LIGHT COMPANY | environmental violation | 2010 | EPA | $260,250 |
| DUKE ENERGY CORPORATION (FORMERLY PSI ENERGY - GIB | environmental violation | 2014 | EPA | $199,000 |
| Cincinnati Gas & Electric Company | utility safety violation | 2003 | OH-PUC | $100,000 |
| PROGRESS ENERGY | environmental violation | 2004 | EPA | $97,185 |
| Duke Energy | air pollution violation | 2001 | CO-DPHE | $97,105 |
| Carolina Power & Light Company | nuclear safety violation | 2004 | NRC | $88,000 |
| Progress Energy Florida, Inc., | energy market violation | 2013 | FERC | $80,000 |
| Duke Energy Progress, LLC | air pollution violation | 2002 | NC-ENV | $73,615 |
| Duke Energy | nuclear safety violation | 2004 | NRC | $60,000 |
| CINERGY CORP. | labor relations violation | 2006 | NLRB | $60,000 |
| DUKE ENERGY KENTUCKY - LIQUID | pipeline safety violation | 2019 | PHMSA | $55,700 |
| Duke Energy (Plainfield) | environmental violation | 2009 | EPA | $54,402 |
| CAROLINA POWER & LIGHT - WAKE 500KV SUBSTATION | environmental violation | 2010 | EPA | $52,000 |
| Cinergy Corporation | labor relations violation | 2000 | NLRB | $50,000 |
| CINERGY CORP. | labor relations violation | 2000 | NLRB | $50,000 |
| DUKE ENERGY | air pollution violation | 2012 | IN-ENV | $42,000 |
| DUKE ENERGY FLORIDA, INC. | workplace safety or health violation | 2014 | OSHA | $35,000 |
| DUKE ENERGY CAROLINAS, LLC | workplace safety or health violation | 2020 | OSHA | $35,000 |
| Duke Energy Ohio Inc | utility safety violation | 2008 | OH-PUC | $30,000 |
| The Cincinnati Gas & Electric Co. | environmental violation | 2005 | OH-ENV | $28,000 |
| DUKE ENERGY | workplace safety or health violation | 2015 | OSHA | $28,000 |
| FLORIDA PROGRESS, LLC | workplace safety or health violation | 2020 | OSHA | $26,988 |
| DUKE ENERGY | water pollution violation | 2008 | IN-ENV | $25,455 |
| The Cincinnati Gas & Electric Co. | environmental violation | 2005 | OH-ENV | $25,200 |
| Cinergy Corp. | environmental violation | 2004 | OH-ENV | $24,828 |
| PROGRESS ENERGY, INC. | workplace safety or health violation | 2011 | OSHA | $21,000 |
| DUKE ENERGY CAROLINAS, LLC | workplace safety or health violation | 2020 | OSHA | $21,000 |
| PROGRESS ENERGY, INC. | workplace safety or health violation | 2004 | OSHA | $19,000 |
| DUKE ENERGY INDIANA - EDWARDSPORT GENERATING STATION | air pollution violation | 2014 | IN-ENV | $18,000 |
| DUKE ENERGY LLC NOBLESVILLE GEN STATION | solid waste violation | 2018 | IN-ENV | $17,500 |
| DUKE ENERGY INDIANA | solid waste violation | 2018 | IN-ENV | $17,500 |
| PROGRESS ENERGY FLORIDA | hazardous waste violation | 2003 | FL-DEP | $16,274 |
| Duke Energy Hot Spring, LLC | air pollution violation | 2003 | AR-ENV | $15,000 |
| Piedmont Natural Gas | utility safety violation | 2013 | TN-PUC | $15,000 |
| CINERGY | workplace safety or health violation | 2003 | OSHA | $14,000 |
| DUKE ENERGY - CAYUGA | environmental violation | 2018 | IN-ENV | $13,500 |
| PROGRESS ENERGY FLORIDA, INC. | air pollution violation | 2006 | FL-DEP | $13,200 |
| DUKE ENERGY CAROLINAS LLC | environmental violation | 2011 | EPA | $12,630 |
| Duke Energy Indiana, LLC | environmental violation | 2023 | IN-ENV | $12,187 |
| CINERGY CORP. | workplace safety or health violation | 2000 | OSHA | $12,000 |
| DUKE ENERGY IN GIBSON GENERATING STATION | environmental violation | 2015 | IN-ENV | $11,250 |
| Duke Power and its subsidiary Duke Engineering & Services; Oswega Tower & Fence Co. | labor relations violation | 2000 | NLRB | $11,000 |
| DUKE ENERGY FLORIDA, LLC | workplace safety or health violation | 2023 | OSHA | $10,547 |
| Duke Energy Carolinas, LLC | air pollution violation | 2014 | NC-ENV | $10,470 |
| DUKE ENERGY OHIO, INC. | workplace safety or health violation | 2014 | OSHA | $10,000 |
| DUKE ENERGY | water pollution violation | 2008 | IN-ENV | $9,500 |
| DUKE ENERGY FLORIDA, LLC | workplace safety or health violation | 2023 | OSHA | $9,488 |
| DUKE ENERGY - LP WINNIE NO 1 CS | environmental violation | 2001 | TX-ENV | $9,352 |
| DUKE ENERGY INDIANA - EDWARDSPORT GENERATING STATION | air pollution violation | 2019 | IN-ENV | $9,000 |
| Progress Energy-Carolina, Incorporated | railroad safety violation | 2011 | FRA | $8,700 |
| DUKE ENERGY | workplace safety or health violation | 2021 | OSHA | $8,700 |
| Duke Energy Carolinas, LLC | air pollution violation | 2024 | NC-ENV | $8,507 |
| PROGRESS ENERGY FLORIDA, INC. | environmental violation | 2009 | FL-DEP | $8,428 |
| PROGRESS ENERGY | environmental violation | 2004 | FL-DEP | $7,500 |
| DUKE ENERGY OHIO, INC. | workplace safety or health violation | 2008 | OSHA | $7,500 |
| DUKE ENERGY CAROLINAS LLC | water pollution violation | 2007 | SC-ENV | $7,268 |
| DUKE ENERGY IN GIBSON GENERATING STATION | air pollution violation | 2003 | IN-ENV | $7,000 |
| Duke Energy Carolinas, LLC | air pollution violation | 2009 | NC-ENV | $6,629 |
| DUKE ENERGY INDIANA INC - R GALLAGHER GENERATING STATION | air pollution violation | 2017 | IN-ENV | $6,250 |
| DUKE ENERGY CAROLINAS, LLC | environmental violation | 2009 | EPA | $6,240 |
| Duke Energy Carolinas, LLC | air pollution violation | 2008 | NC-ENV | $6,218 |
| DUKE ENERGY CORPORATION | air pollution violation | 2003 | SC-ENV | $6,000 |
| DUKE ENERGY CORPORATION | environmental violation | 2015 | EPA | $5,785 |
| DUKE ENERGY CAROLINAS, LLC | workplace safety or health violation | 2009 | OSHA | $5,600 |
| Duke Energy Carolinas, LLC | air pollution violation | 2013 | NC-ENV | $5,303 |
| DUKE ENERGY GENERATION SERVICES HOLDING CO, INC | workplace safety or health violation | 2010 | OSHA | $5,250 |
| PROGRESS ENERGY FLORIDA, INC. | environmental violation | 2006 | FL-DEP | $5,200 |
| PROGRESS ENERGY | environmental violation | 2006 | FL-DEP | $5,100 |
