Exhibit 21
Subsidiaries of KeySpan Companies and Jurisdiction of Organization
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Active Conditioning, LLC d/b/a KeySpan Home Energy Services - Delaware
Adrian Associates L.P.- New York
Alberta Northeast Gas, Ltd. (26.0% Own) - Canada
AMR Data Corporation - Massachusetts
Binsky & Snyder Plumbing, LLC d/b/a KeySpan Business Solutions - Delaware
Binsky & Snyder, LLC d/b/a KeySpan Business Solutions - Delaware
Binsky and Snyder Service, LLC d/b/a KeySpan Business Solutions- Delaware
Boston Gas Company d/b/a/ KeySpan Energy Delivery New England - Massachusetts
Boundary Gas, Inc. (39.10%) - Delaware
Broken Bridge Corp.- New Hampshire
Capital Marine Supply, Inc. - Louisiana
Chotin Transportation, Inc.- Louisiana
Colonial Gas Company d/b/a/ KeySpan Energy Delivery New England- Massachusetts
Cross Bay Pipeline Company, LLC (25% Interest)- Delaware
Delta KeySpan, LLC d/b/a KeySpan Business Solutions- Delaware
Eastern Urban Services, Inc.- Delaware
Eastern Rivermoor Company, Inc..- Delaware
Eastern Associated Terminals Company - Delaware
Eastern Associated Securities Corp.- Massachusetts
Eastern Enterprises - Massachusetts
Eastern Energy Systems Corp.- Delaware
EnergyNorth Realty, Inc.- New Hampshire
EnergyNorth Natural Gas, Inc. d/b/a/ KeySpan Energy Delivery New England - New
Hampshire
Essex Gas Company d/b/a/ KeySpan Energy Delivery New England- Massachusetts
Federal Barge Lines, Inc.- Delaware
FINSA Energeticos, S. de R.L. de C.V. (50% Interest) - Mexico
Fourth Avenue Enterprise Piping, LLC d/b/a KeySpan Business Solutions- Delaware
Fritze KeySpan, LLC d/b/a KeySpan Home Energy Services - Delaware
GEI Development Corp.- Delaware
Granite State Plumbing & Heating, LLC d/b/a KeySpan Business Solutions- Delaware
Grupo KeySpan, S. de R.L. de C.V. (99.9% Own) - Mexico
GTM Energy LLC (50% Ownership)- Delaware
Hartley Marine Corp.- Delaware
Honeoye Storage Corporation (52.2% Interest) - New York
Iroquois Gas Transmission Systems, L.P. (19.49% Interest)- Delaware
Island Energy Services Company, Inc. - New York
Islander East Pipeline Company, LLC (50% Ownership)- Delaware
KeySpan Business Solutions, LLC d/b/a KeySpan Business Solutions - Delaware
KeySpan C.I., Ltd. - Cayman Islands
KeySpan CI II Ltd. - Cayman Islands
KeySpan CI Midstream Limited - Cayman Islands
KeySpan Communications Corp. - New York
KeySpan Corporate Services LLC - New York
KeySpan Corporation d/b/a KeySpan Energy - New York
KeySpan Cross Bay, LLC - Delaware
KeySpan Electric Services LLC - New York
KeySpan Energy Canada Partnership d/b/a KeySpan Canada- Canada
KeySpan Energy Canada, Inc. d/b/a KeySpan Canada- Canada
KeySpan Energy Corporation - New York
KeySpan Energy Development Co. d/b/a KeySpan Canada- Canada
KeySpan Energy Development Corporation - Delaware
KeySpan Energy Facilities Limited d/b/a KeySpan Canada- Canada
KeySpan Energy Management, LLC d/b/a KeySpan Business Solutions- Delaware
KeySpan Energy Services, Inc. d/b/a KeySpan Home Energy Services - Delaware
KeySpan Energy Solutions, LLC d/b/a KeySpan Home Energy Services - Delaware
KeySpan Energy Supply, Inc. - Delaware
KeySpan Energy Trading Services LLC
KeySpan Engineering & Survey, Inc. - New York
KeySpan Engineering Associates, Inc. d/b/a KeySpan Business Solutions- New York
KeySpan Exploration and Production, LLC - Delaware
KeySpan Gas East Corporation d/b/a/ KeySpan Energy Delivery Long Island- New
York
KeySpan Generation LLC - New York
KeySpan Home Energy Services (New England), LLC d/b/a KeySpan Home Energy
Services - Delaware
KeySpan Home Energy Services, LLC d/b/a KeySpan Home Energy Services - Delaware
KeySpan International Corporation - Delaware
KeySpan Islander East Pipeline, LLC - Delaware
KeySpan Luxembourg S.A.R.L. - Luxembourg
KeySpan MHK, Inc. - Delaware
KeySpan Midstream LLC - Delaware
KeySpan Natural Fuels LLC - Delaware
KeySpan North East Ventures Inc.- Delaware
KeySpan Plumbing Solutions, Inc. d/b/a KeySpan Home Energy Services - New York
KeySpan Plumbing & Heating Solutions, LLC d/b/a KeySpan Home Energy Services -
Delaware
KeySpan Ravenswood Services Corp. - New York
KeySpan Ravenswood, Inc. - New York
KeySpan Services, Inc.- Delaware
KeySpan Technologies Inc. - New York
KeySpan Telemetry Solutions, LLC.- Delaware
KeySpan UK Limited - United Kingdom
KeySpan Utilities Services LLC - New York
KS Midstream Finance Co. - Canada
KSI Contracting, LLC d/b/a KeySpan Business Solutions- Delaware
KSI Mechanical, LLC d/b/a KeySpan Business Solutions - Delaware
KSI Electrical, LLC d/b/a KeySpan Business Solutions - Delaware
LILCO Energy Systems, Inc. - New York
Marquez Development Corp. - New York
Midland Enterprises Inc. - Delaware
Minnesota Harbor Service, Inc. - Minnesota
MyHomeGate, Inc. - Delaware myHomeKey.com Inc. (25 % Interest) - Delaware
Mystic Steamship Corporation - Delaware
Nicodama Beheer V. B.V. - Netherlands
North East Transmission Co., Inc. - Delaware
Northeast Gas Markets LLC (90% Ownership) - Delaware
Northern Peabody, LLC d/b/a KeySpan Business Solutions- Delaware
Orgulf Transport Co. - Delaware
Orsouth Transport Co. - Delaware
Paulus, Sokolowski and Sartor, LLC d/b/a KeySpan
Business Solutions- Delaware
PCC Land Company, Inc. - Texas
Philadelphia Coke Co., Inc. - Delaware
Phoenix Natural Gas Limited (24.5% Interest) - Northern Ireland
Port Allen Marine Service, Inc. - Louisiana
Premier Transmission Limited (50% Interest) - Northern Ireland
R.D. Mortman, LLC d/b/a KeySpan Business Solutions- Delaware
Red Circle Transport Co.- Delaware
River Fleets, Inc.- Louisiana
Solex Production Ltd. - Canada
The Brooklyn Union Gas Company d/b/a/ KeySpan Energy Delivery New York - New
York
The Ohio River Company - West Virginia
The Ohio River Terminals Company - Delaware
The Ohio River Company Traffic Division, Inc. - Pennsylvanua
The Houston Exploration Company (67.% Own)- Delaware
THEC Holdings Corp.- Delaware
TNG Liquids Ltd. - Canada
Transgas, Inc. - Massachussetts
WDF, Inc. d/b/a KeySpan Business Solutions - New York
West Virginia Terminals, Inc. - West Virginia
Western Associated Energy Corp.- Delaware
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