| Washington Gas Light Company | AltaGas | utility safety violation | 2023 | VA-SCC | $118,000 |
| Southern California Edison Company | Edison International | nuclear safety violation | 2019 | NRC | $116,000 |
| The Connecticut Light and Power Company dba Eversource Energy | EverSource Energy | environmental violation | 2018 | CT-ENV | $115,000 |
| Constellation Energy Commodities Group Inc. | Constellation Energy Corporation | utility service violation | 2009 | TX-PUC | $115,000 |
| Golden Valley Assn, AK Industrial Development & Ex | Golden Valley Electric Association | environmental violation | 2012 | EPA | (*)Penalty amounts marked by an asterisk are ones announced by more than one agency. Parent penalty totals are adjusted to avoid double-counting. $115,000 |
| Southern California Edison Co. | Edison International | consumer protection violation | 2022 | CA-PUC | $114,179 |
| Rochester Gas & Electric Corporation | Iberdrola | labor relations violation | 2016 | NLRB | $114,083 |
| Louisville Gas & Electric Co. | PPL Corp. | air pollution violation | 2013 | KY-LMAPCD | $113,250 |
| Direct Energy Business, LLC | NRG Energy | utility service violation | 2017 | CA-PUC | $113,153 |
| TOTAL ENVIRONMENTAL SOLUTIONALS, INC. (TESI) | South Louisiana Electric Cooperative | environmental violation | 2014 | EPA | (*)Penalty amounts marked by an asterisk are ones announced by more than one agency. Parent penalty totals are adjusted to avoid double-counting. $112,500 |
| Enogex Inc. | OGE Energy | air pollution violation | 2003 | OK-ENV | $112,050 |
| Reliant Energy Power Supply, LLC | NRG Energy | utility service violation | 2007 | TX-PUC | $111,581 |
| Just Energy | Just Energy Group | consumer protection violation | 2010 | OH-PUC | $111,000 |
| Golden Valley Electric Association LLC | Golden Valley Electric Association | environmental violation | 2018 | EPA | $110,570 |
| FirstEnergy Nuclear Operating Company | FirstEnergy | nuclear safety violation | 2000 | NRC | $110,000 |
| Commonwealth Edison Company | Exelon | nuclear safety violation | 2000 | NRC | $110,000 |
| Dresser Rand Company | Siemens Energy | employment discrimination | 2011 | EEOC | $110,000 |
| SHENANGO INC | DTE Energy | environmental violation | 2005 | PA-ENV | $110,000 |
| AEP Texas Central Company | American Electric Power | utility service violation | 2011 | TX-PUC | $110,000 |
| Columbia Gas of Virginia, Inc | NiSource | utility safety violation | 2009 | VA-SCC | $109,500 |
| INVENERGY | Invenergy | utility service violation | 2015 | TX-PUC | $109,000 |
| NATIONAL GRID LNG L.P. | National Grid | pipeline safety violation | 2007 | PHMSA | $108,000 |
| Virginia Electric and Power Co. | Dominion Energy | environmental violation | 2015 | VA-ENV | $106,207 |
| AMERIGAS PROPANE LP | UGI Corp. | pipeline safety violation | 2009 | PHMSA | $105,600 |
| Southern Nuclear Operating Company, Inc. | Southern Company | labor relations violation | 2011 | NLRB | $105,370 |
| GENON POWER MIDWEST LP | NRG Energy | environmental violation | 2006 | PA-ENV | $105,000 |
| Detroit Edison | DTE Energy | consumer protection violation | 2006 | MI-PSC | $105,000 |
| South Jersey Gas | South Jersey Industries | utility safety violation | 2019 | NJ-BPU | $105,000 |
| SUNRUN INSTALLATION SERVICES, INC. | Sunrun Inc. | workplace safety or health violation | 2022 | OSHA | $105,000 |
| Southern California Edison Company | Edison International | labor relations violation | 2004 | NLRB | $104,653 |
| TAMPA ELECTRIC COMPANY | Emera | solid waste violation | 2001 | FL-DEP | $104,000 |
| Southcross CCNG Transmission Ltd. | Southcross Energy Partners | environmental violation | 2018 | TX-RRC | $104,000 |
| Ohio Power Co. d/b/a American Electric Power | American Electric Power | environmental violation | 2005 | EPA | $103,110 |
| Southern California Edison Co. | Edison International | consumer protection violation | 2022 | CA-PUC | $103,001 |
| Southern Power Co. | Southern Company | air pollution violation | 2024 | CA-ARB | $102,462 |
| AEP Companies | American Electric Power | utility service violation | 2006 | TX-PUC | $101,000 |
| Atlanta Gas Light Company | Southern Company | labor relations violation | 2003 | NLRB | $100,000 |
| Wisconsin Electric Power Company | WEC Energy Group | environmental violation | 2013 | WI-AG | $100,000 |
| EAST KENTUCKY POWER COOPERATIVE | East Kentucky Power Cooperative | air pollution violation | 2005 | KY-ENV | $100,000 |
| CONSTELLATION POWER | Constellation Energy Corporation | air pollution violation | 2007 | MD-ENV | $100,000 |
| The Dayton Power and Light Co. | AES Corp. | environmental violation | 2014 | OH-ENV | $100,000 |
| Pacific Gas & Electric Co. (PG&E) | PG&E Corp. | utility safety violation | 2018 | CA-PUC | $100,000 |
| Pacific Gas & Electric Co. (PG&E) | PG&E Corp. | utility safety violation | 2015 | CA-PUC | $100,000 |
| Peoples Gas | WEC Energy Group | utility safety violation | 2013 | IL-ICC | $100,000 |
| Ameren-CILCO | Ameren | utility safety violation | 2013 | IL-ICC | $100,000 |
| Vectren North | CenterPoint Energy | utility safety violation | 2012 | IN-URC | $100,000 |
| Cincinnati Gas & Electric Company | Duke Energy | utility safety violation | 2003 | OH-PUC | $100,000 |
| Metropolitan Edison Company | FirstEnergy | consumer protection violation | 2010 | PA-PUC | $100,000 |
| Reliant Energy Retail Service, LLC | NRG Energy | consumer protection violation | 2020 | TX-PUC | $100,000 |
| Reliant Energy Retail Services, LLC | NRG Energy | consumer protection violation | 2018 | TX-PUC | $100,000 |
| EDF Energy Trading | EDF-Electricite de France | utility service violation | 2017 | TX-PUC | $100,000 |
| Constellation Energy Commodities Group, Inc. | Constellation Energy Corporation | utility service violation | 2012 | TX-PUC | $100,000 |
| TXU Electric Delivery Company | Vistra Energy | utility service violation | 2006 | TX-PUC | $100,000 |
| Pacific Gas and Electric Company | PG&E Corp. | utility safety violation | 2022 | CA-PUC | $100,000 |
| NRG Texas Power LLC | NRG Energy | utility service violation | 2022 | TX-PUC | $100,000 |
| ALGONQUIN POWER SYSTEMS INC | Algonquin Power & Utilities | environmental violation | 2006 | EPA | $100,000 |
| HAWAIIAN ELECTRIC COMPANY INC. | Hawaiian Electric Industries | environmental violation | 2000 | EPA | $100,000 |
| HAWAIIAN ELECTRIC COMPANY INC. | Hawaiian Electric Industries | environmental violation | 2000 | EPA | $100,000 |
| AEP Texas North Co. | American Electric Power | utility service violation | 2012 | TX-PUC | $99,500 |
| Pepco Holdings, Inc. | Exelon | employment screening violation | 2015 | private lawsuit-federal | $99,000 |
| Southern Indiana Gas and Electric Company | CenterPoint Energy | environmental violation | 2022 | IN-ENV | $99,000 |
| TPI COMPOSITES IOWA LLC | TPI Composites | workplace safety or health violation | 2017 | OSHA | $99,000 |
| Southwestern Electric Power Company | American Electric Power | environmental violation | 2008 | TX-ENV | $98,176 |
| Southern California Edison Co. | Edison International | consumer protection violation | 2022 | CA-PUC | $97,315 |
| PROGRESS ENERGY | Duke Energy | environmental violation | 2004 | EPA | $97,185 |
| Duke Energy | Duke Energy | air pollution violation | 2001 | CO-DPHE | $97,105 |
| American Electric Power Service Corporation | American Electric Power | wage and hour violation | 2014 | WHD | $96,227 |
| Pacific Gas and Electric Company | PG&E Corp. | nuclear safety violation | 2005 | NRC | $96,000 |
| UGI UTILITIES, INC (Gas Division) | UGI Corp. | utility safety violation | 2014 | PA-PUC | $96,000 |
| SIEMENS POWER TRANSMISSION AND DISTRIBUTION, INC. | Siemens Energy | environmental violation | 2009 | EPA | $95,636 |
| EES Coke Battery L.L.C. | DTE Energy | air pollution violation | 2015 | MI-ENV | $95,000 |
| Atmos Energy Corp. | Atmos Energy | environmental violation | 2014 | TX-RRC | $95,000 |
| Southern California Edison | Edison International | air pollution violation | 2000 | CA-SCAQMD | $95,000 |
| Detroit Edison | DTE Energy | consumer protection violation | 2005 | MI-PSC | $95,000 |
| Xcel Energy, Inc. | Xcel Energy | environmental violation | 2009 | EPA | $95,000 |
| Virginia Electric and Power Co. | Dominion Energy | environmental violation | 2015 | VA-ENV | $94,476 |
| EAST KENTUCKY POWER COOPERATIVE, INC. | East Kentucky Power Cooperative | environmental violation | 2009 | EPA | $93,936 |
| EDF Industrial Power Services | EDF-Electricite de France | consumer protection violation | 2021 | CA-PUC | $92,974 |
| New York State Electric and Gas Corporation | Iberdrola | environmental violation | 2022 | EPA | $92,740 |
| Georgia Power Company | Southern Company | water pollution violation | 2000 | GA-ENV | $92,000 |
| Columbia Gas of Virginia, Inc | NiSource | utility safety violation | 2017 | VA-SCC | $92,000 |
| MIRANT MID-ATLANTIC | NRG Energy | air pollution violation | 2010 | MD-ENV | $91,000 |
| Southern California Gas Company | Sempra Energy | labor relations violation | 2002 | NLRB | $90,645 |
| Ohio Power Co. | American Electric Power | environmental violation | 2004 | OH-ENV | $90,587 |
| Yankee Gas | EverSource Energy | labor relations violation | 2007 | NLRB | $90,000 |
| The Connecticut Light and Power Company | EverSource Energy | environmental violation | 2000 | CT-ENV | $90,000 |
| Just Energy | Just Energy Group | consumer protection violation | 2010 | IL-ICC | $90,000 |
| AEP Texas Central Company | American Electric Power | utility service violation | 2011 | TX-PUC | $90,000 |
| Puget Sound Energy | Puget Sound Energy | utility safety violation | 2005 | WA-UTC | $90,000 |
| Pacific Gas and Electric Co. et al. | PG&E Corp. | consumer protection violation | 2022 | CA-PUC | $89,880 |
| SOUTHCROSS ENERGY PARTNERS GP, LLC | Southcross Energy Partners | workplace safety or health violation | 2015 | OSHA | $89,600 |
| AEP Texas Central Company | American Electric Power | utility service violation | 2016 | TX-PUC | $89,000 |
| Carolina Power & Light Company | Duke Energy | nuclear safety violation | 2004 | NRC | $88,000 |
| Dominion Nuclear Connecticut, Inc. | Dominion Energy | nuclear safety violation | 2002 | NRC | $88,000 |
| Consolidated Edison Company of New York | Consolidated Edison | nuclear safety violation | 2000 | NRC | $88,000 |
| TAMPA ELECTRIC COMPANY | Emera | environmental violation | 2010 | FL-DEP | $88,000 |
| Columbia Gas of Virginia, Inc | NiSource | utility safety violation | 2008 | VA-SCC | $87,750 |
| Aqua Utilities, Inc. | Essential Utilities Inc. | environmental violation | 2011 | TX-ENV | $86,860 |
| West Penn Power Company | FirstEnergy | utility safety violation | 2014 | PA-PUC | $86,000 |
| Prairie State Generating Company LLC | Prairie State Generating | workplace safety or health violation | 2023 | MSHA | $85,580 |
| Prairie State Generating Company LLC | Prairie State Generating | workplace safety or health violation | 2023 | MSHA | $85,580 |
