Investor-owned utility

An investor-owned utility or IOU is a business organization, providing a product or service regarded as a utility (often termed a public utility regardless of ownership), and managed as private enterprise rather than a function of government or a utility cooperative. Such businesses can range from a family whose residential property includes a well whose flow in excess of the family's own needs produces a secondary income, to international communications conglomerates, but political and infrastructure considerations in some countries makes the private sector of the electric-power production and distribution industry the most often discussed investor-owned utilities there.

List of Investor Owned Electric Power Delivery Utilities with Assets in the United States of America

Parent Company	Operating Company	Operating States
AES Corporation	Indianapolis Power & Light	IN
	Dayton Power and Light	OH
Allete	Minnesota Power	MN
	Superior Water, Light and Power	WI
Alliant Energy	Interstate Power and Light	IA
	Wisconsin Power and Light	WI
Ameren	Ameren Illinois	IL
	Ameren Missouri	MO
American Electric Power	AEP Ohio	OH, WV
	AEP Texas	TX
	Appalachian Power	TN, VA, WV
	Indiana Michigan Power	IN, MI
	Kentucky Power	KY
	Public Service Company of Oklahoma	OK
	Southwestern Electric Power	TX
American Transmission Company	American Transmission Company	WI, MI
Avista Corporation	Avista Utilities	ID, WA
Black Hills Corporation	Black Hills Power	CO, SD, IA, KS, NE
	Cheyenne Light, Fuel & Power	WY
CenterPoint Energy	CenterPoint Energy	TX
Fortis Inc.	Central Hudson Gas & Electric	NY
CLECO	Cleco	LA
Consolidated Edison	Consolidated Edison	NY
	Orange and Rockland Utilities	NY, NJ, PA
CMS Energy	Consumers Energy	MI
Dominion Resources	Dominion Virginia Power	VA
	Dominion North Carolina Power	NC
DQE	Duquesne Light	PA
DTE Energy Electric Company	Detroit Edison	MI
Duke Energy	Duke Energy Carolinas	NC, SC
	Duke Energy Progress	NC, SC
	Duke Energy Indiana	IN
	Duke Energy Ohio	OH
	Duke Energy Kentucky	KY
	Duke Energy Florida	FL
Edison International	Southern California Edison	CA
El Paso Electric	El Paso Electric	TX, NM
Emera	Bangor Hydro Electric	ME
	Maine Public Service	ME
Énergir	Central Vermont Public Service	VT
	Green Mountain Power	VT
Energy Future Holdings	Oncor Electric Delivery	TX
Entergy	Entergy Arkansas	AR
	Entergy Louisiana	LA
	Entergy Gulf States	LA
	Entergy Mississippi	MS
	Entergy New Orleans	LA
	Entergy Texas	TX
Eversource Energy	Connecticut Light & Power	CT
	Public Service New Hampshire	NH
	Western Massachusetts Electric	MA
Exelon	Commonwealth Edison	IL
	Philadelphia Electric	PA
	Baltimore Gas & Electric	MD
	Potomac Electric Power	DC, MD
	Delmarva Power	DE, MD
	Atlantic City Electric	NJ
FirstEnergy	Ohio Edison	OH
	Cleveland Electric Illuminating	OH
	Toledo Edison	OH
	Pennsylvania Power	PA
	Penelec	PA
	Met-Ed	PA
	Jersey Central P&L	NJ
	Allegheny Energy	PA
	Monongahela Power	WV
	Potomac Edison	MD, WV, VA
	West Penn	PA
Great Plains Energy	Kansas City Power and Light	MO, KS
Hawaiian Electric Industries	Hawaii Electric Company	HI
	Hawaii Electric Light Company	HI
	Maui Electric Company	HI
Iberdrola	Rochester Gas & Electric	NY
	New York State Electric & Gas	NY
	Central Maine Power	ME
Integrys Energy Group	Wisconsin Public Service Corporation	WI
	Upper Peninsula Power Company	MI
ITC Holdings	ITC Transmission	MI
	Michigan Electric Transmission Company	MI
	ITC Midwest	IA, MN, IL, MO
	ITC Great Plains	OK, KS
MDU Resources	Montana-Dakota Utilities	MT, ND, SD, WY
MGE Energy	Madison Gas and Electric	WI
Berkshire Hathaway Energy	MidAmerican Energy Company	IL, SD, NE
	Pacificorp--Pacific Power	OR, CA, WA
	Pacificorp--Rocky Mountain Power	UT, WY, ID
	NV Energy	NV, CA
National Grid plc	New England Power	MA, NH, RI, VT, CT, ME
	Massachusetts Electric	MA
	Nantucket Electric	MA
	Narragansett Electric	MA
	Granite State Electric	NH
	Niagara Mohawk Power	NY
	Long Island Lighting	NY
NextEra Energy	Florida Power & Light	FL
NiSource	Northern Indiana Public Service Company	IN
NorthWestern Corporation	NorthWestern Energy	SD, MT, NE
NRG Energy	Reliant Energy	TX
NSTAR	Boston Edison	MA
	Cambridge Electric Light	MA
	Commonwealth Electric	MA
OGE Energy Corporation	Oklahoma Gas & Electric	OK, AR
Otter Tail Corporation	Otter Tail Power	ND, MN, SD
PG&E Corporation	Pacific Gas & Electric Company	CA
Pinnacle West Capital	Arizona Public Service	AZ
PNM Resources	Public Service Company of New Mexico	NM
	Texas-New Mexico Power	TX
Portland General Electric	Portland General Electric	OR
PPL	PPL Electric Utilities	PA
	Louisville Gas & Electric	KY
	Kentucky Utilities	KY
Public Service Enterprise Group	Public Service Electric & Gas	NJ
Puget Energy	Puget Sound Energy	WA
SCANA	South Carolina Electric & Gas Company	SC
Sempra Energy	San Diego Gas & Electric	CA
Southern Company	Alabama Power	AL
	Georgia Power	GA
	Gulf Power	FL
	Mississippi Power	MS
TECO Energy	Tampa Electric	FL
UGI Corporation	United Electric Company	PA
UIL Holdings Corporation	The United Illuminating Company	CT
UniSource Energy	Tucson Electric Power	AZ
	UNS Electric	AZ
Unitil	Unitil Energy	MA, NH
	Fitchburg Gas & Electric	MA
Vectren	Southern Indiana Gas and Electric	IN
Westar Energy	Westar Energy	KS
Wisconsin Energy Corporation	We Energies	WI
Xcel Energy	Northern States Power Company	MN, ND, SD, WI
	Public Service Colorado	CO
	Southwestern Public Service	NM, TX