| American Electric Power | air pollution violation | 2007 | EPA | $4,675,000,000 |
| 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 |
| American Electric Power Company, Inc. and AEP Energy Services, Inc. | energy market violation | 2005 | CFTC | $30,000,000 |
| American Electric Power | energy market violation | 2005 | DOJ_CRIMINAL | $30,000,000 |
| American Electric Power Co. | energy market violation | 2005 | FERC | $21,000,000 |
| American Electric Power Company Inc. | price-fixing or anti-competitive practices | 2017 | private lawsuit-federal | $9,400,000 |
| American Electric Power | air pollution violation | 2013 | MULTI-AG | $8,500,000 |
| AMERICAN ELECTRIC POWER | environmental violation | 2020 | EPA | $8,025,000 |
| AMERICAN ELECTRIC POWER CO (NATIONAL CASE) | environmental violation | 2007 | EPA | (*)Penalty amounts marked by an asterisk are ones announced by more than one agency. Parent penalty totals are adjusted to avoid double-counting. $6,225,000 |
| Public Service Company of Oklahoma | labor relations violation | 2004 | NLRB | $6,029,281 |
| American Electric Power | air pollution violation | 2019 | MULTI-AG | $4,000,000 |
| American Electric Power Company Inc. | price-fixing or anti-competitive practices | 2009 | private lawsuit-federal | $1,750,000 |
| AMERICAN ELECTRIC POWER | environmental violation | 2007 | EPA | (*)Penalty amounts marked by an asterisk are ones announced by more than one agency. Parent penalty totals are adjusted to avoid double-counting. $750,000 |
| American Electric Power Service Corporation | wage and hour violation | 2015 | WHD | $396,096 |
| American Electric Power Service Corporation (AEP) | utility service violation | 2016 | TX-PUC | $215,000 |
| AEP Texas Central Company | utility service violation | 2010 | TX-PUC | $169,000 |
| AEP Texas Central Company | utility service violation | 2008 | TX-PUC | $165,000 |
| AEP Texas Central Company | utility service violation | 2011 | TX-PUC | $110,000 |
| Ohio Power Co. d/b/a American Electric Power | environmental violation | 2005 | EPA | $103,110 |
| AEP Companies | utility service violation | 2006 | TX-PUC | $101,000 |
| AEP Texas North Co. | utility service violation | 2012 | TX-PUC | $99,500 |
| Southwestern Electric Power Company | environmental violation | 2008 | TX-ENV | $98,176 |
| American Electric Power Service Corporation | wage and hour violation | 2014 | WHD | $96,227 |
| Ohio Power Co. | environmental violation | 2004 | OH-ENV | $90,587 |
| AEP Texas Central Company | utility service violation | 2011 | TX-PUC | $90,000 |
| AEP Texas Central Company | utility service violation | 2016 | TX-PUC | $89,000 |
| AEP Texas Central Company | utility service violation | 2018 | TX-PUC | $85,000 |
| AMERICAN ELECTRIC POWER COMPANY AND APPALACHIAN PO | workplace safety or health violation | 2005 | OSHA | $85,000 |
| AEP - Texas | utility service violation | 2018 | TX-PUC | $84,000 |
| Indiana Michigan Power Company, d.b.a. American Po | environmental violation | 2005 | EPA | $80,769 |
| AEP Texas North Company | utility service violation | 2010 | TX-PUC | $80,000 |
| AEP Texas North Company | utility service violation | 2016 | TX-PUC | $76,000 |
| AEP KENTUCKY POW ER / BIG SANDY PLANT | air pollution violation | 2010 | KY-ENV | $75,000 |
| AEP Texas North Company | utility service violation | 2012 | TX-PUC | $74,500 |
| SOUTHWESTERN ELECTRIC POWER COMPANY | utility service violation | 2019 | TX-PUC | $74,000 |
| AEP Texas North Company | utility service violation | 2018 | TX-PUC | $72,000 |
| AEP Texas Central Company | utility service violation | 2014 | TX-PUC | $72,000 |
| Dolet Hills Lignite Company LLC | workplace safety or health violation | 2009 | MSHA | $70,000 |
| AEP Texas Inc | utility service violation | 2019 | TX-PUC | $69,000 |
| AEP Texas | utility service violation | 2012 | TX-PUC | $68,500 |
| AEP Texas Central Company | utility service violation | 2014 | TX-PUC | $66,500 |
| AEP Texas Central Company | utility service violation | 2011 | TX-PUC | $65,000 |
| Indiana Michigan Power Company | nuclear safety violation | 2005 | NRC | $60,000 |
| AEP -TCC | utility service violation | 2015 | TX-PUC | $57,000 |
| AEP TEXAS | utility service violation | 2021 | TX-PUC | $56,000 |
| AMERICAN ELECTRIC POWER COMPANY, INC., MUSKINGUM | workplace safety or health violation | 2007 | OSHA | $55,650 |
| AEP Southwestern Electric Power Company | utility service violation | 2008 | TX-PUC | $54,000 |
| AEP Texas North Company | utility service violation | 2014 | TX-PUC | $51,500 |
| Southwestern Electric Power Company | utility service violation | 2011 | TX-PUC | $51,250 |
| APPLACHIAN POWER COMPANY | environmental violation | 2011 | EPA | $48,624 |
| AEP Texas North Company | utility service violation | 2014 | TX-PUC | $48,000 |
| SOUTHWESTERN ELECTRIC POWER COMPANY | utility service violation | 2019 | TX-PUC | $45,000 |
| AEP Southwestern Electric Company | utility service violation | 2019 | TX-PUC | $45,000 |
| SOUTHWESTERN ELECTRIC POWER COMPANY | environmental violation | 2000 | EPA | $41,500 |
| AEP Texas Central Company | utility service violation | 2012 | TX-PUC | $40,500 |
| Ohio Power Co. | environmental violation | 2002 | OH-ENV | $40,000 |
| AEP Texas Central Company | utility service violation | 2011 | TX-PUC | $40,000 |
| Southwestern Electric Power Company | utility service violation | 2011 | TX-PUC | $39,000 |
| SWEPCO | utility service violation | 2018 | TX-PUC | $38,000 |
| Southwestern Electric Power Company | utility service violation | 2012 | TX-PUC | $38,000 |
| AEP Texas Central Co. | utility service violation | 2012 | TX-PUC | $36,500 |
| APPALACHIAN POWER CO | environmental violation | 2012 | EPA | $36,270 |
| PUBLIC SERVICE COMPANY OF OKLAHOMA | workplace safety or health violation | 2023 | OSHA | $31,250 |
| Southwestern Electric Power Company | utility service violation | 2011 | TX-PUC | $29,610 |
| Southwestern Elctric Power Company | environmental violation | 2009 | EPA | $29,250 |
| SWEPCO | utility service violation | 2017 | TX-PUC | $29,000 |
| Southwestern Electric Power Company | utility service violation | 2013 | TX-PUC | $29,000 |
| Dolet Hills Lignite Company LLC | workplace safety or health violation | 2009 | MSHA | $28,500 |
| INDIANA MICHIGAN POWER COMPANY/AMERICAN ELECTRIC POWER COMPANY | labor relations violation | 2005 | NLRB | $25,000 |
| AEP -TNC | utility service violation | 2015 | TX-PUC | $25,000 |
| AEP Texas North Company | utility service violation | 2015 | TX-PUC | $25,000 |
| Southwestern Electric Power Company | utility service violation | 2010 | TX-PUC | $25,000 |
| AEP - SWEPCO | utility service violation | 2015 | TX-PUC | $23,000 |
| AEP Texas North Company | utility service violation | 2015 | TX-PUC | $21,000 |
| INDIANA MICHIGAN POWER CO DBA AMERICAN ELECTRIC POWER | air pollution violation | 2004 | IN-ENV | $20,000 |
| AEP Central | utility service violation | 2017 | TX-PUC | $20,000 |
| AEP SWEPCO | utility service violation | 2021 | TX-PUC | $20,000 |
| American Electric Power d/b/a Public Service Co. of Oklahoma | labor relations violation | 2008 | NLRB | $19,000 |
| Appalachian Power Company | environmental violation | 2021 | VA-ENV | $18,547 |
| Appalachian Power Co. | environmental violation | 2017 | VA-ENV | $17,500 |
| AEP Sharyland | utility service violation | 2016 | TX-PUC | $15,000 |
| Ohio Power Company | labor relations violation | 2004 | NLRB | $13,953 |
| Southwestern Electric Power Company | environmental violation | 2018 | TX-ENV | $13,800 |
| AMERICAN ELECTRIC POWER | workplace safety or health violation | 2004 | OSHA | $12,600 |
| American Electric Power | air pollution violation | 2005 | WV-ENV | $12,500 |
| AMERICAN ELECTRIC POWER | workplace safety or health violation | 2021 | OSHA | $12,432 |
| PSEG LAWRENCEBURG ENERGY CO | air pollution violation | 2005 | IN-ENV | $11,000 |
| AMERICAN ELECTRIC POWER - CENTRAL MACHINE SHOP | workplace safety or health violation | 2019 | OSHA | $10,500 |
| APPALACHIAN POWER COMPANY | workplace safety or health violation | 2002 | OSHA | $10,000 |
| Dolet Hills Lignite Company LLC | workplace safety or health violation | 2009 | MSHA | $10,000 |
| Dolet Hills Lignite Company LLC | workplace safety or health violation | 2009 | MSHA | $10,000 |
| Dolet Hills Lignite Company LLC | workplace safety or health violation | 2010 | MSHA | $10,000 |
| SOUTHWESTERN ELECTRIC POWER COMPANY | workplace safety or health violation | 2018 | OSHA | $9,701 |
| AMERICAN ELECTRIC POWER - PHILLIP SPORN PLANT | workplace safety or health violation | 2002 | OSHA | $9,375 |
| APPALACHIAN POWER COMPANY | environmental violation | 2024 | EPA | $9,187 |
| APPALACHIAN POWER COMPANY - PHILLIP SPORN PLANT | workplace safety or health violation | 2001 | OSHA | $9,000 |
| INDIANA MICHIGAN POWER COMPANY | workplace safety or health violation | 2001 | OSHA | $9,000 |
| AEP OHIO POWER COMPANY | workplace safety or health violation | 2015 | OSHA | $8,820 |
| AEP Texas Central Company | environmental violation | 2017 | TX-ENV | $8,451 |
| AEP - SWEPCO | utility service violation | 2014 | TX-PUC | $8,000 |
| AEP Companies | utility service violation | 2008 | TX-PUC | $7,500 |
