Table 3. Parent Corporation Main Lines of Business
Parent Corporation	Primary SIC Code	Natural Gas and Related Natural Gas Operations					Electric & Related Electric Service Operations
		Natural Gas			Other Natural Gas		Electric Services		Other Energy Operations
		Transmission & Storagea	Oil & Gas Production	Gathering & Processing	Local Distribution Companies	Energy Marketing & Services	Generation, Transmission & Distribution	Energy Marketing & Services	Cogeneration	Independent Power Plants
Coastal Corp.	4922	X	X	X		X			X
Columbia Energy Group	4923	X	X	X	X	X		X	X
Consolidated Natural Gas Co.	4923	X	X		X	X		X
Duke Energy Corp.	4911	X		X		X	X	X		X
El Paso Energy Corp.	4922	X				X		X
Enron Corp.	5172	X	X			X	X	X
KN Energy Inc.	4923	X		X	X	X		X
MDU Resources Group Inc.	4931	X	X	X	X		X
Northern States Power	4931	X			X		X
PG&E Corp.	4931	X		X	X	X	X	X		X
Questar Corp.	4923	X	X	X	X	X		X
Reliant Energy Inc.	4911	X		X	X	X	X	X		X
Sonat Inc.	4922	X	X			X		X
Williams Companies Inc.	4922	X	X	X		X		X
Total		14	8	9	8	12	6	11	2	3
Source: Lines of Business were compiled from companies individual Securities and Exchange Commission Form 10-K, 1997.
aThe parent companies in this category have separate operations in transmission and in storage.
Notes: The following SIC Codes denote primary business operations: SIC Code 4911, electric services; SIC Code 4922, natural gas transmission; SIC Code 4923, natural gas transmission and distribution; SIC Code 4931, electric and other services combined; and SIC Code 5172, wholesale-petroleum and petroleum products (no bulk stations).
Four companies have natural gas liquid plants: Coastal, KN Energy, PG&E, and Williams Company.
Other lines of operations include chemical operations, coal operations, construction, downstream petroleum, and real estate.

Last Updated on 9/8/99
By Financial Analysis Team, Office of Energy Markets and End Use, Energy Information Adminstration johnson
Email: susanne.johnson@eia.doe.gov