1
EXHIBIT 21
State of
Name of Company Organization Location Nature of Business
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NiSource Inc. Indiana Merrillville, Holding company
Indiana
NiSource Corporate Indiana Merrillville, Management services
Services Company Indiana
Hamilton Harbour Indiana Merrillville, Captive insurance
Insurance Services, Ltd. Indiana program
NI Telecomm, Inc.(7) Indiana Merrillville, Inactive
Indiana
Crossroads Pipeline Indiana Merrillville, Interstate gas
Company (7) Indiana transmission
NiSource Capital Markets, Indiana Hammond, Funding agent for
Inc. Indiana all subsidiaries
other than Northern
Indiana Public Service
Company
NEM Acquisition Indiana Merrillville, Holding company
Corp. (25) Indiana
IWC Resources Indiana Indianapolis, Holding company
Corporation Indiana
Indianapolis Water Indiana Indianapolis, Water company
Company (1) Indiana
Harbour Water Indiana Indianapolis, Water company
Corporation (1) Indiana
2
Liberty Water Indiana Indianapolis, Water company
Corporation (1) Indiana
Utility Data Indiana Indianapolis, Provides customer
Corporation (1) Indiana billing and data
processing services
IWC Services, Inc. Indiana Indianapolis, Majority partner
(1) Indiana in wastewater
treatment
facilities
White River Indiana Indianapolis, Operator of waste-
Environmental Indiana water treatment
Partnership (2) plants
Waterway Holdings, Inc. Indiana Indianapolis, Real-estate
(1) Indiana development
SM&P Utility Resources, Indiana Indianapolis, Provides utility
Inc. (1) Indiana locate and
marking services
Miller Pipeline Indiana Indianapolis, Pipeline
Corporation (1) Indiana construction
Primary Energy, Inc. Indiana Merrillville, Arranges energy-
Indiana related projects
Harbor Coal Company (3) Indiana Merrillville, Coal pulverization
Indiana project company
Lakeside Energy Indiana Merrillville, Electric generator
Corporation (3) Indiana project company
North Lake Energy Indiana Merrillville, Electric generation
Corporation (3) Indiana project company
Portside Energy Indiana Merrillville, Power generation
Corporation (3) Indiana project company
3
Cokenergy, Inc. (3) Indiana Merrillville, Power generation
Indiana project company
Ironside Energy Indiana Merrillville, Power generation
Corporation (3) Indiana project company
Ironside Energy LLC (3) Indiana Merrillville, Power generation
Indiana project company
Whiting Clean Indiana Merrillville, Power generation
Energy, Inc. (3) Indiana project company
Northern Indiana Public Indiana Hammond, Electric and
Service Company Indiana gas utility
NIPSCO Exploration Indiana Hammond, Gas exploration
Company, Inc. (4) Indiana investment in
off-shore Gulf of
Mexico oil and
gas leases
Shore Line Shops, Indiana Hammond, Real estate
Incorporated (4) Indiana purchase and sale
of transferred
employees
residences
NI Energy Services, Indiana Merrillville, Holding company for
Inc. Indiana energy-related
diversified
projects and
subsidiaries
Market Hub Partners, Delaware Wilmington, General partner of
Inc. (6) Delaware Market Hub Partners, L.P.
Market Hub Partners, Delaware Houston, Natural gas
L.P. (5)(22) Texas storage
4
NI Fuel Company, Indiana Merrillville, Investments in
Inc. (25) Indiana gas and oil
ventures
Bristol Resources Delaware Tulsa, Oil and gas
Production Company, Oklahoma exploration
L.L.C. (8) and production
NFCO Acquisition Company Texas Dallas, Investment in
(9) Texas gas and oil
properties
NI-TEX, Inc. (25) Indiana Merrillville, Gas supply and
Indiana transportation
NI-TEX Gas Services, Delaware Dallas, Gas storage
Inc. (25) Texas
Laredo Nueces Pipeline Texas Dallas, Intrastate gas
Company (20) Texas pipeline company
Midtex Gas Storage Texas Matagorda Gas storage and
Company, L.L.P. (21) County, Texas intrastate pipeline
company
NESI Energy Marketing, Indiana Merrillville, Marketing of natural
L.L.C. (10) (11) Indiana gas energy and
energy services
Green Fuels, Inc. (7) Indiana Merrillville, Alternative
Indiana fuels
NI Energy Services Indiana Merrillville, Gas Pipeline
Transportation, Inc. (25) Indiana
NESI Power Marketing, Indiana Merrillville, Inactive
Inc. (7) Indiana
EnergyUSA Retail, Indiana Merrillville, Retail gas
Inc. (25) Indiana marketing
5
EnergyUSA Consumer Massachusetts Taunton, Holding company
Products Group, Inc.(33) Massachusetts
EnergyUSA Commercial Indiana Merrillville, Energy consulting for
Energy Services, Inc. (25) Indiana commercial lighting
NIPSCO Energy Services Alberta Calgary, Holding company
Canada, Ltd. (7) Alberta, Canada for subsidiaries
NESI Canadian Holdings, Indiana Merrillville, Holding company for
Inc. (25) Indiana energy-related
diversified projects
and subsidiaries
Portland Natural Gas Maine Portsmouth, Gas pipeline
Transmission System (23) New Hampshire
NESI Energy Marketing Alberta Calgary, Inactive
Canada, Ltd. (12) Alberta, Canada (In bankruptcy)
NiSource Development Indiana Merrillville, Holding company
Company, Inc. Indiana (including real
estate development
investments)
Analytic Systems Indiana Hobart, Fluid filtration
Laboratories, Inc. (13) Indiana systems
Protonics Research, Inc. Indiana Merrillville, Energy research
(13) Indiana and development
JOF Transportation Indiana Merrillville, Rail freight
Company (14) Indiana venture
KOGAF Enterprises, Inc. Indiana Kokomo, Real estate
(14) Indiana investments
6
Lake Erie Land Company (14) Indiana Merrillville, Development
Indiana of commercial
and residential
real estate
South Works Power Indiana Merrillville, Holds a lease
Company (14) Indiana
SCC Services, Inc. (15) Indiana Merrillville, Operation of
Indiana golf course
Illinois Indiana Illinois Merrillville, Rail freight
Development Co., LLC (34) Indiana venture
N Squared Aviation, Delaware Griffith, Aircraft
LLC (16) Indiana leasing
NDC Douglas Properties, Indiana Merrillville, Affordable
Inc. (14) Indiana housing projects
Customer Information Indiana Merrillville, Consulting services
Services, Inc. (14) Indiana for customer
information systems
Cardinal Property Indiana Merrillville, Building and
Management, Inc. (14) Indiana property
management
Progeni, Inc. Illinois Chicago, Energy product
(14) Illinois development
Sun Power California Sunnyvale, Silicon-based
Corporation (19) California semiconductor
products
Kokomo Gas and Fuel Indiana Kokomo, Gas utility
Company Indiana
7
KGF Trading Indiana Kokomo, Inactive
Company (18) Indiana
Northern Indiana Fuel and Indiana Auburn, Gas utility
Light Company, Inc. Indiana
Northern Indiana Trading Indiana Auburn, Gas brokering
Company, Inc.(17) Indiana
NIPSCO Capital Trust I Delaware Merrillville, Business trust
Indiana which issues
securities
Bay State Gas Company Massachusetts Westborough, Gas utility
Massachusetts
Bay State GPE, Inc.(24) Massachusetts Westborough, Electric generation
Massachusetts
Northern Utilities, New Hampshire Portsmouth, Gas utility
Inc. (24) New Hampshire
Lawrence Water Company, Indiana Lawrence, Water company
Inc. (1) Indiana
IWC Morgan Water Indiana Morgan County, Water company
Company (1) Indiana
The Darlington Water Indiana Darlington, Water company
Works Company (1) Indiana
Watertech Operational Indiana Indianapolis, Services company
Services, Inc. (1) Indiana
IWCR Management Indiana Indianapolis, Services company
Services Company (1) Indiana
Irishman's Run Indiana Zionsville, Acquisition vehicle
Acquisition Corp. (1) Indiana of IWC Resources Corporation
8
Colcom, Incorporated (1) Texas Austin, Provides utility
Texas locate and marking
services
UGTI /d.b.a./Underground California Ventura, Provides utility
Technology, Inc. (35) California locate and marking
services
EnergyUSA, Inc. Indiana Merrillville, Holding company
Indiana
EnergyUSA Inc. (25) Massachusetts Taunton, Propane company
Massachusetts
EnergySPE, Inc. (31) Massachusetts Taunton, Lighting services
Massachusetts
Savage Alert, Inc. (31) Connecticut Bloomfield, Holding company
Connecticut
Savage-Engineering, Connecticut Bloomfield, Engineering services
Inc. (36) Connecticut
Alert, Inc. (36) Connecticut Bloomfield, Design and
Connecticut construction management
Alert Air Systems, Massachusetts Bloomfield, HVAC contracting services
Inc. (36) Connecticut
Brayer Energy California Irwindale, Energy efficient
Solutions, Inc. (36) California lighting
Alert Mechanical Connecticut Bloomfield, HVAC contracting services
Services, Inc. (36) Connecticut
EnergyUSA-TCP Delaware Houston, Gas marketing
Corp. (25) Texas
TPC Electric Delaware Houston, Power marketing
Corporation (26) Texas
9
Evangeline Development Delaware Houston, Land development
Corporation (26) Texas
Allison Development Delaware Houston, Land development
Company (26) Texas
Copiah County Storage Mississippi Copiah, Real estate
Company (37) Mississippi holding company
Wolverine Land Michigan Houston, Land development
and Development Texas
Corporation(27)
Farmington Properties Pennsylvania Wellsboro, Land development
Inc. (27) Pennsylvania
TPC Gas Storage Delaware Houston, Holding company
Services, Inc. (26) Texas
TPC Transmission, Inc. (26) Delaware Houston, Inactive
Moss Bluff Development Delaware Houston, Land development
Corporation (32) Texas
MB Acquisition Delaware Houston, Land development
Corporation (27) Texas
TPC Gas Storage Delaware Houston, Holding company
Services, L.P. (27) Texas
Tioga Gas Storage Delaware Houston, Holding company
Company (27) Texas
NiSource Pipeline Indiana Merrillville, Holding company
Group, Inc. Indiana
Granite State Gas New Hampshire Westborough, Pipeline
Transmission, Inc. (29) Massachusetts
10
Natural Gas Development Massachusetts Westborough, Holding company
Inc. (30) Massachusetts
Portland Natural Gas Maine Portsmouth, Gas pipeline
Transmission System (38) New Hampshire
Bay State Energy Massachusetts Westborough, Inactive
Enterprises, Massachusetts
Inc. (30)
LNG Development Corp. (30) Massachusetts Westborough, Inactive
Massachusetts
PNGTS Holding Corp. (29) Indiana Merrillville, Holding company
Indiana
Portland Natural Gas Maine Portsmouth, Gas pipeline
Transmission System (39) New Hampshire
TPC Storage Holding Delaware Houston, Holding company
Corp. (28) Texas
Market Hub Delaware Houston, Natural gas
Partners, L.P. (40) Texas storage
Copiah County Mississippi Copiah County, Real estate
Storage Company (41) Mississippi holding company
Market Hub Delaware Wilmington, General partner of
Partners, Inc. (42) Delaware Market Hub Partner, L.P.
(1) Wholly-owned subsidiary of IWC Resources Corporation.
(2) Majority-owned interest of IWC Services, Inc.
(3) Wholly-owned subsidiary of Primary Energy, Inc.
(4) Wholly-owned subsidiary of Northern Indiana Public Service Company.
(5) Minority-owned partnership of NI Energy Services, Inc.
(6) Minority-owned interest of NI Energy Services, Inc.
11
(7) Wholly-owned subsidiary of NI Energy Services, Inc.
(8) Majority-owned interest of NI Fuel Company, Inc.
(9) Wholly-owned subsidiary of NI Fuel Company, Inc.
(10) Majority-owned interest of EnergyUSA, Inc. (IN).
(11) Minority-owned interest of NEM Acquisition Corp.
(12) Majority-owned subsidiary of NiSource Energy Services Canada Ltd.
(13) Majority-owned subsidiary of NiSource Development Company, Inc.
(14) Wholly-owned subsidiary of NiSource Development Company, Inc.
(15) Wholly-owned subsidiary of Lake Erie Land Company.
(16) Minority-owned interest of NiSource Development Company, Inc.
(17) Wholly-owned subsidiary of Northern Indiana Fuel and Light Company,
Inc.
(18) Wholly-owned subsidiary of Kokomo Gas and Fuel Company.
(19) Minority-owned interest of NiSource Development Company, Inc.
(20) 50% owned interest of NI-TEX, Inc.
(21) Minority-owned interest of NI-TEX Gas Services, Inc.
(22) Minority-owned interest of Market Hub Partners, Inc.
(23) Minority-owned interest of PNGTS Holding Corp.
(24) Wholly-owned subsidiary of Bay State Gas Company.
(25) Wholly-owned subsidiary of EnergyUSA, Inc. (IN).
(26) Wholly-owned subsidiary of EnergyUSA-TPC Corp.
(27) Wholly-owned subsidiary of TPC Gas Storage Services, Inc.
(28) Wholly-owned subsidiary of TPC Gas Storage Services, L.P.
(29) Wholly-owned subsidiary of NiSource Pipeline Group, Inc.
(30) Wholly-owned subsidiary of Granite State Gas Transmission Inc.
(31) Wholly-owned subsidiary of EnergyUSA, Inc. (MA).
(32) Majority-owned subsidiary of TPC Storage Services, Inc.
(33) Wholly-owned subsidiary of EnergyUSA Retail, Inc.
(34) Minority-owned interest of SCC Services, Inc.
(35) 50% owned interest of IWC Resources Corporation.
(36) Wholly-owned subsidiary of Savage Alert, Inc.
(37) Minority-owned interest of Allison Development Company.
(38) Minority-owned interest of Natural Gas Development Inc.
(39) Minority-owned interest of PNGTS Holding Corp.
(40) Majority-owned interest of TPC Storage Services, L.P.
(41) Majority-owned interest of Market Hub Partners, L.P.
(42) Minority-owned interest of TPC Gas Storage Services, L.P.