U.S. Electric Utility Directory · Maryland

Electric utilities in Maryland

Every electric utility serving Maryland in EIA data year 2025, with ownership type, grid operator, balancing authority, customers and the counties each one serves.

Compiled October 31, 2026. Grid operators present: PJM.

Retail utilities124 investor-owned, 3 co-ops, 5 municipal
All entities89Including marketers and other filers
Counties covered23With at least one utility listed
Retail customers2,595,453Sum of utility customer counts

Retail electric utilities in Maryland

Sorted by customers. See Maryland on the map, and the state regulator, Maryland Public Service Commission.

12 retail utilities serving Maryland
UtilityEIA IDTypeISO or regionBalancing authorityCustomersCounties served
Baltimore Gas & Electric CoBGE (Exelon)1167Investor-ownedPJMPJM1,290,9318 Anne Arundel, Calvert, Carroll, Harford, Howard, Montgomery, Prince George's, Baltimore
Potomac Electric Power CoPepco (Exelon)15270Investor-ownedPJMPJM574,9242 Montgomery, Prince George's
The Potomac Edison CompanyPotomac Edison (FirstEnergy, MD/WV)15263Investor-ownedPJMPJM268,8307 Allegany, Carroll, Frederick, Garrett, Howard, Montgomery, Washington
Delmarva PowerDelmarva Power (Exelon)5027Investor-ownedPJMPJM205,84810 Caroline, Cecil, Dorchester, Harford, Kent, Queen Anne's, Somerset, Talbot, Wicomico, Worcester
Southern Maryland Elec Coop Inc17637CooperativePJMPJM165,8394 Calvert, Charles, Prince George's, St. Mary's
Choptank Electric Coop, Inc3503CooperativePJMPJM54,1509 Caroline, Cecil, Dorchester, Kent, Queen Anne's, Somerset, Talbot, Wicomico, Worcester
Hagerstown Light Department7908MunicipalPJMPJM17,4651 Washington
Easton Utilities Comm5625MunicipalPJMPJM10,7251 Talbot
Thurmont Municipal Light Co18901MunicipalPJMPJM2,8701 Frederick
Town of Berlin - (MD)1615MunicipalPJMPJM2,5521 Worcester
Town of Williamsport - (MD)20729MunicipalPJMPJM1,0051 Washington
A & N Electric Coop84CooperativePJMPJM3141 Somerset

Which utilities serve each county in Maryland

23 counties, with the grid operator serving most customers
CountyFIPSISO or regionUtilitiesUtilities serving the county
Allegany24001PJM1The Potomac Edison Company
Anne Arundel24003PJM1Baltimore Gas & Electric Co
Baltimore24510PJM1Baltimore Gas & Electric Co
Calvert24009PJM2Baltimore Gas & Electric Co, Southern Maryland Elec Coop Inc
Caroline24011PJM2Delmarva Power, Choptank Electric Coop, Inc
Carroll24013PJM2Baltimore Gas & Electric Co, The Potomac Edison Company
Cecil24015PJM2Delmarva Power, Choptank Electric Coop, Inc
Charles24017PJM1Southern Maryland Elec Coop Inc
Dorchester24019PJM2Delmarva Power, Choptank Electric Coop, Inc
Frederick24021PJM2The Potomac Edison Company, Thurmont Municipal Light Co
Garrett24023PJM1The Potomac Edison Company
Harford24025PJM2Baltimore Gas & Electric Co, Delmarva Power
Howard24027PJM2Baltimore Gas & Electric Co, The Potomac Edison Company
Kent24029PJM2Delmarva Power, Choptank Electric Coop, Inc
Montgomery24031PJM3Potomac Electric Power Co, Baltimore Gas & Electric Co, The Potomac Edison Company
Prince George's24033PJM3Potomac Electric Power Co, Baltimore Gas & Electric Co, Southern Maryland Elec Coop Inc
Queen Anne's24035PJM2Delmarva Power, Choptank Electric Coop, Inc
Somerset24039PJM3Delmarva Power, Choptank Electric Coop, Inc, A & N Electric Coop
St. Mary's24037PJM1Southern Maryland Elec Coop Inc
Talbot24041PJM3Delmarva Power, Easton Utilities Comm, Choptank Electric Coop, Inc
Washington24043PJM3The Potomac Edison Company, Hagerstown Light Department, Town of Williamsport - (MD)
Wicomico24045PJM2Delmarva Power, Choptank Electric Coop, Inc
Worcester24047PJM3Delmarva Power, Choptank Electric Coop, Inc, Town of Berlin - (MD)

Retail power marketers and other entities in Maryland

Competitive suppliers, wholesale marketers, transmission-only companies and behind-the-meter providers that report to EIA for Maryland. They have no county service territory of their own.

EntityEIA IDTypeISO or regionCustomers
Constellation NewEnergy, Inc13374Retail power marketerPJM147,273
WGL Energy Services, Inc.20659Retail power marketerPJM65,175
Direct Energy Services54820Retail power marketerPJM44,186
SolarCity Corporation57313Behind-the-meter providerPJM26,991
XOOM Energy Maryland, LLC57490Retail power marketerPJM20,337
Energy Services Providers, Inc55874Retail power marketerPJM19,424
Commerce Energy, Inc.4100Retail power marketerPJM19,353
Reliant Energy Northeast LLC57037Retail power marketerPJM18,347
Ambit Energy Holdings, LLC56212Retail power marketerPJM14,194
CleanChoice Energy, Inc.58951Retail power marketerPJM13,282
Clearview Electric Inc.58974Retail power marketerPJM12,803
Inspire Energy Holdings, LLC59310Retail power marketerPJM11,712
IDT Energy, Inc.55815Retail power marketerPJM10,100
Direct Energy Business18193Retail power marketerPJM9,385
Stream Energy Maryland, LLC56876Retail power marketerPJM7,645
SmartEnergy Holdings, LLC58956Retail power marketerPJM7,339
Green Mountain Energy Company7554Retail power marketerPJM6,410
North American Power and Gas, LLC58667Retail power marketerPJM6,156
Major Energy Electric Services56504Retail power marketerPJM5,596
Public Power & Utility of Maryland, LLC58116Retail power marketerPJM5,481
Palmco Power MD, LLC57185Retail power marketerPJM5,134
Atlantic Energy LLC60583Retail power marketerPJM4,930
Viridian Energy PA LLC58162Retail power marketerPJM4,830
Sunrun Inc.59647Behind-the-meter providerPJM4,368
SFE Energy Maryland, Inc.59084Retail power marketerPJM4,330
Energy Plus Holdings LLC56265Retail power marketerPJM4,160
Spark Energy, LP17710Retail power marketerPJM3,281
Tomorow Energy Corp.58952Retail power marketerPJM3,047
Interstate Gas Supply, Inc.58957Retail power marketerPJM2,648
MidAmerican Energy Services, LLC59931Retail power marketerPJM2,435
MPower Energy NJ LLC60218Retail power marketerPJM2,293
AEP Energy55722Retail power marketerPJM1,626
Spring Energy RRH LLC dba Spring Power &60124Retail power marketerPJM1,576
Horizon Power and Light, LLC59062Retail power marketerPJM1,399
AP Holdings LLC56571Retail power marketerPJM1,195
Great American Power, LLC59064Retail power marketerPJM1,145
Plymouth Rock Energy, LLC57307Retail power marketerPJM1,120
Eligo Energy, LLC59054Retail power marketerPJM1,099
Think Energy, LLC65310Retail power marketerPJM1,047
NextEra Energy Services, LLC7279Retail power marketerPJM958
Sunnova59579Behind-the-meter providerPJM912
EverBright, LLC66036Behind-the-meter providerPJM861
Palmetto Solar, LLC66026Behind-the-meter providerPJM819
StateWise Energy Maryland LLC62154Retail power marketerPJM789
Median Energy Corp.63168Retail power marketerPJM756
Park Power LLC59797Retail power marketerPJM691
Shipley Choice, LLC59410Retail power marketerPJM615
Greenlight Energy Inc.59810Retail power marketerPJM612
Champion Energy Services54862Retail power marketerPJM570
ENGIE Resources LLC19107Retail power marketerPJM433
CPV Retail Energy LP65439Retail power marketerPJM417
Powervine Energy62148Retail power marketerPJM324
SmartestEnergy US LLC63356Retail power marketerPJM303
American Power & Gas59799Retail power marketerPJM281
National Gas & Electric, LLC63232Retail power marketerPJM262
Greenbacker Renewable Energy Corporation60025Behind-the-meter providerPJM231
RPA Energy, Inc.63695Retail power marketerPJM223
Discount Energy Group, LLC58973Retail power marketerPJM217
Nordic Energy Services, LLC59088Retail power marketerPJM216
UGI Energy Services, Inc.56408Retail power marketerPJM196
Talen Energy Marketing, LLC28802Retail power marketerPJM103
Discount Power Inc - (CT)59993Retail power marketerPJM102
Texas Retail Energy, LLC50046Retail power marketerPJM78
First Point Power, LLC59793Retail power marketerPJM73
Agressive Energy LLC63008Retail power marketerPJM67
BP Energy Retail LLC64314Retail power marketerPJM52
Spruce Finance59943Behind-the-meter providerPJM49
Calpine Energy Solutions, LLC16840Retail power marketerPJM38
First Energy Solutions Corp.6458Retail power marketerPJM29
Constellation Solar Holding, LLC59086Behind-the-meter providerPJM13
Freepoint Energy Solutions LLC61131Retail power marketerPJM11
TerraForm US Energy Services, LLC60981Behind-the-meter providerPJM7
American PowerNet49730Retail power marketerPJM2
Brookfield Renewable Energy Marketing US LLC66399Retail power marketerPJM1
Greenskies Renewable Energy, LLC61823Behind-the-meter providerPJM1
CECG Maine, LLC4166Wholesale marketerOther (no ISO)—
Constellation Energy Generation, LLC65506Wholesale marketerOther (no ISO)—

About this data

Which utilities exist comes from the U.S. Energy Information Administration’s Form EIA-861 and EIA-861S, data year 2025 (final release, October 7, 2026), read directly from eia.gov. County service territories, balancing authority codes and customer counts come from EIA-861 for 2018, the latest year compiled at county level for this directory; utilities that started reporting after 2018 carry their 2025 values. County boundaries are U.S. Census cartographic boundaries (us-atlas 3.0, Albers USA projection).

Customer counts are per utility within Maryland. A county’s grid operator is the one serving most of its customers, estimated by spreading each utility’s customers evenly over its counties. Download every state in one file from the U.S. Electric Utility Directory.

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