| Pacific Gas & Electric Co. | PG&E Corp. | utility safety violation | 2020 | private lawsuit-federal | $13,500,000,000 |
| American Electric Power | American Electric Power | environmental violation | 2007 | EPA | $4,675,000,000 |
| American Electric Power | American Electric Power | environmental violation | 2007 | 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. $4,675,000,000 |
| South Carolina Electric & Gas | Dominion Energy | consumer protection violation | 2019 | private lawsuit-state | $2,200,000,000 |
| Pacific Gas & Electric Co. (PG&E) | PG&E Corp. | utility safety violation | 2020 | CA-PUC | $1,937,000,000 |
| Pacific Gas & Electric Co. (PG&E) | PG&E Corp. | utility safety violation | 2015 | CA-PUC | $1,600,000,000 |
| Cinergy Corporation | Duke Energy | environmental violation | 2000 | EPA | $1,430,000,000 |
| Virginia Electric Power Co. | Dominion Energy | environmental violation | 2003 | EPA | $1,219,200,000 |
| Ohio Edison Company | FirstEnergy | environmental violation | 2005 | EPA | $1,133,500,000 |
| Wisconsin Power and Light Company | Alliant Energy | environmental violation | 2013 | EPA | $1,010,950,000 |
| Pacific Gas & Electric | PG&E Corp. | utility safety violation | 2019 | CA-MULTI | $1,000,000,000 |
| Duke Energy | Duke Energy | environmental violation | 2021 | NC-AG | $855,000,000 |
| Powerex | BC Hydro | price-fixing or anti-competitive practices | 2013 | CA-AG | $750,000,000 |
| Mirant Corporation | NRG Energy | price-fixing or anti-competitive practices | 2005 | CA-AG | $749,700,000 |
| East Kentucky Power Cooperative | East Kentucky Power Cooperative | environmental violation | 2007 | EPA | $650,750,000 |
| Wisconsin Electric Power Company | WEC Energy Group | environmental violation | 2003 | EPA | $623,200,000 |
| Northern Indiana Public Service Co. | NiSource | environmental violation | 2011 | EPA | $613,000,000 |
| Pacific Gas & Electric | PG&E Corp. | utility safety violation | 2013 | private lawsuit-state | $565,000,000 |
| Southern California Edison Co. | Edison International | utility safety violation | 2021 | CA-PUC | $550,000,000 |
| Dynegy Midwest Generation | Vistra Energy | environmental violation | 2005 | EPA | $524,000,000 |
| Westar Energy | Evergy Inc. | environmental violation | 2010 | EPA | $509,000,000 |
| Reliant Energy, Inc. | NRG Energy | price-fixing or anti-competitive practices | 2005 | MULTI-AG | $460,000,000 |
| Southern California Edison | Edison International | utility safety violation | 2019 | private lawsuit-state | $360,000,000 |
| PSEG Fossil LLC | Public Service Enterprise | environmental violation | 2002 | EPA | $344,400,000 |
| Dominion Energy Inc. | Dominion Energy | consumer protection violation | 2020 | private lawsuit-state | $320,000,000 |
| ABB Ltd. | ABB Ltd. | Foreign Corrupt Practices Act | 2022 | DOJ_CRIMINAL | $315,000,000 |
| Wisconsin Public Service Corporation | WEC Energy Group | environmental violation | 2013 | EPA | $307,200,000 |
| Entergy Mississippi | Entergy | utility administrative violation | 2022 | MS-PSC | $300,000,000 |
| PG&E Corp. | PG&E Corp. | environmental violation | 2006 | private lawsuit-state | $295,000,000 |
| Dynegy | Vistra Energy | price-fixing or anti-competitive practices | 2004 | CA-AG | $281,500,000 |
| FirstEnergy Corp. | FirstEnergy | kickbacks and bribery | 2021 | USAO | $230,000,000 |
| Duke Energy | Duke Energy | price-fixing or anti-competitive practices | 2004 | MULTI-AG | $207,500,000 |
| Alabama Power Company | Southern Company | environmental violation | 2006 | EPA | $200,000,000 |
| Commonwealth Edison Company | Exelon | kickbacks and bribery | 2020 | USAO | $200,000,000 |
| Ameren | Ameren | utility safety violation | 2007 | MO-AG | $179,750,000 |
| Consolidated Edison Company of New York, Inc. | Consolidated Edison | utility administrative violation | 2016 | NY-PSC | $171,000,000 |
| PG&E | PG&E Corp. | environmental violation | 2021 | CA-SFCA | $160,600,000 |
| Dairyland Power Cooperative | Dairyland Power Cooperative | environmental violation | 2012 | EPA | $155,950,000 |
| Consolidated Edison Company of New York, Inc. | Consolidated Edison | utility safety violation | 2017 | NY-PSC | $153,300,000 |
| Pacific Gas and Electric Company | PG&E Corp. | utility safety violation | 2023 | CA-PUC | $150,000,000 |
| Southern California Edison Co. | Edison International | utility administrative violation | 2008 | CA-PUC | $146,000,000 |
| Columbia Gas | EverSource Energy | utility safety violation | 2020 | private lawsuit-state | $143,000,000 |
| SCANA Corp. | Dominion Energy | investor protection violation | 2020 | SEC | $137,500,000 |
| Kentucky Utilities | PPL Corp. | environmental violation | 2009 | EPA | $136,400,000 |
| West Virginia-American Water Company et al. | American Water Works | environmental violation | 2018 | private lawsuit-federal | $126,000,000 |
| Pacific Gas & Electric Co. (PG&E) | PG&E Corp. | utility safety violation | 2021 | CA-PUC | $125,000,000 |
| Southern California Gas Company | Sempra Energy | environmental violation | 2018 | CA-AG | $119,500,000 |
| Public Service Company of New Mexico | PNM Resources | consumer protection violation | 2023 | NM-AG | $115,000,000 |
| Pacific Gas & Electric Co. (PG&E) | PG&E Corp. | utility safety violation | 2020 | CA-PUC | $110,000,000 |
| Duke Energy Corporation | Duke Energy | environmental violation | 2015 | EPA | $102,000,000 |
| Minnkota Power Cooperative and Square Butte Electric Cooperative | Minnkota Power Cooperative | environmental violation | 2006 | EPA | $100,000,000 |
| Pacific Gas & Electric Co. (PG&E) | PG&E Corp. | utility administrative violation | 2018 | CA-PUC | $97,500,000 |
| Duke Energy | Duke Energy | environmental violation | 2009 | EPA | $93,000,000 |
| Consolidated Edison Company of New York, Inc. | Consolidated Edison | utility service violation | 2021 | NY-PSC | $82,050,000 |
| GDF SUEZ Energy Marketing NA, Inc. | Engie | energy market violation | 2017 | FERC | $81,800,000 |
| Duke Energy | Duke Energy | price-fixing or anti-competitive practices | 2016 | private lawsuit-federal | $80,875,000 |
| Southern California Edison | Edison International | utility safety violation | 2024 | USAO | $80,000,000 |
| ABB Ltd | ABB Ltd. | Foreign Corrupt Practices Act | 2022 | SEC | $75,000,000 |
| Consolidated Edison Company of New York, Inc. | Consolidated Edison | utility service violation | 2008 | NY-PSC | $63,000,000 |
| Kentucky Utilities Company | PPL Corp. | environmental violation | 2013 | EPA | $57,300,000 |
| Potomac Electric Power Company | Exelon | environmental violation | 2023 | DC-AG | $57,000,000 |
| NiSource Inc. et al. | NiSource | consumer protection violation | 2020 | MA-AG | $56,000,000 |
| Columbia Gas of Massachusetts | EverSource Energy | utility safety violation | 2020 | MA-DPU | $56,000,000 |
| ABB Inc. | ABB Ltd. | benefit plan administrator violation | 2019 | private lawsuit-federal | $55,000,000 |
| Pacific Gas and Electric Company | PG&E Corp. | utility safety violation | 2022 | CA-MULTI | $55,000,000 |
| Constellation Energy Group | Constellation Energy Corporation | environmental violation | 2008 | private lawsuit-state | $54,000,000 |
| Bay State Gas Company, d/b/a Columbia Gas of Massachusetts | EverSource Energy | environmental violation | 2020 | USAO | $53,030,116 |
| ABB Middle East & Africa Participations AG | ABB Ltd. | price-fixing or anti-competitive practices | 2001 | DOJ_ANTITRUST | $53,000,000 |
| PG&E et al. | PG&E Corp. | environmental violation | 2013 | USAO | $50,500,000 |
| Reliant Energy Services, Inc. | NRG Energy | energy market violation | 2003 | FERC | $50,000,000 |
| FirstEnergy Corp. | FirstEnergy | consumer protection violation | 2022 | private lawsuit-federal | $49,000,000 |
| Exelon Corporation | Exelon | fraud | 2023 | SEC | $46,200,000 |
| Commonwealth Edison | Exelon | consumer protection violation | 2014 | IL-AG | $46,000,000 |
| WEC Energy Group | WEC Energy Group | benefit plan administrator violation | 2012 | private lawsuit-federal | $45,000,000 |
| NSTAR Gas & Electric Co. | EverSource Energy | consumer protection violation | 2015 | MA-AG | $44,700,000 |
| Progress Energy | Duke Energy | False Claims Act and related | 2004 | CA-SFCA | $43,100,000 |
| Golden Valley Electric Association | Golden Valley Electric Association | environmental violation | 2012 | EPA | $40,365,000 |
| PSEG Energy Resources & Trade, LLC | Public Service Enterprise | energy market violation | 2018 | FERC | $39,400,000 |
| ABB Ltd. | ABB Ltd. | Foreign Corrupt Practices Act | 2010 | SEC | $39,300,000 |
| National Grid USA | National Grid | privacy violation | 2022 | private lawsuit-federal | $38,500,000 |
| Pacific Gas & Electric Co. (PG&E) | PG&E Corp. | utility safety violation | 2011 | CA-PUC | $38,000,000 |
| Southern California Edison Co. | Edison International | utility safety violation | 2013 | CA-PUC | $37,000,000 |
| Consolidated Edison Company of New York, Inc. | Consolidated Edison | utility safety violation | 2008 | NY-PSC | $37,000,000 |
| Pacific Gas & Electric Co. (PG&E) | PG&E Corp. | consumer protection violation | 2007 | CA-PUC | $35,000,000 |
| Southern Indiana Gas and Electric Company, Inc. | CenterPoint Energy | environmental violation | 2003 | EPA | $33,100,000 |
| EAST KENTUCKY POWER COOPERATIVE | East Kentucky Power Cooperative | environmental violation | 2013 | EPA | $30,684,571 |
| American Electric Power Company, Inc. and AEP Energy Services, Inc. | American Electric Power | data submission deficiencies | 2005 | CFTC | $30,000,000 |
| American Electric Power | American Electric Power | data submission deficiencies | 2005 | DOJ_CRIMINAL | $30,000,000 |
| Duke Energy Retirement Cash Balance Plan | Duke Energy | benefit plan administrator violation | 2011 | private lawsuit-federal | $30,000,000 |
| Cinergy Corporation | Duke Energy | environmental 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 |
| Sempra Energy Corporation | Sempra Energy | price-fixing or anti-competitive practices | 2006 | NV-AG | $30,000,000 |
| Southern California Edison Company | Edison International | consumer protection violation | 2009 | CA-PUC | $30,000,000 |
| Pacific Gas & Electric | PG&E Corp. | utility safety violation | 2012 | USAO | $29,500,000 |
| Eversource | EverSource Energy | consumer protection violation | 2021 | CT-AG | $29,000,000 |
| Duke Energy Trading and Marketing, L.L.C. | Duke Energy | price-fixing or anti-competitive practices | 2003 | CFTC | $28,000,000 |
| FirstEnergy Nuclear Operating Company | FirstEnergy | nuclear safety violation | 2006 | NRC | $28,000,000 |
| CMS Energy Corp. | CMS Energy | benefit plan administrator violation | 2006 | private lawsuit-federal | $28,000,000 |
| First Energy/Cleveland Electric Illuminating Company | FirstEnergy | labor relations violation | 2001 | NLRB | $27,382,600 |
| San Diego Gas & Electric | Sempra Energy | utility safety violation | 2012 | CA-SDCA | $27,000,000 |
| Aquila Merchant Services | Evergy Inc. | price-fixing or anti-competitive practices | 2004 | CFTC | $26,500,000 |
| Pacific Gas & Electric Co. (PG&E) | PG&E Corp. | utility safety violation | 2016 | CA-PUC | $25,600,000 |
