Utilities

California

• California Water Service Co.
• Pacific Gas & Electric Co.

Colorado

• LaPlata Electric Association, Inc.
• Western Gas Supply Co

Connecticut

• Connecticut Light & Power Co.
• Northeast Nuclear Energy Co.
• Northeast Utilities Service Co.
• Southern New England Telephone Co.
• United Illuminating Co.
• Yankee Gas Services Co.

Delaware

• Delmarva Power & Light Co.

Iowa

• IES Utilities Inc.

Illinois

• Commonwealth Edison

Massachusetts

• Southern Indiana Gas & Electric Co.
• Alogonquin Gas Transmission Co.
• Boston Edison Co.
• Commonwealth Gas Co.
• Holyoke Water Power Co.
• Littleton Electric Light Co.
• New England Power Service Co.
• NYNEX/NE Telephone Co.
• Western Massachusetts Electric Co.

Michigan

• Ameritech
• Michigan Bell

New Jersey

• Public Service Electric & Gas Co.

Nevada

• Wells Rural Electric Co.

New York

• Brooklyn Union Gas Co.
• New York Power Authority
• NYNEX/NY Telephone Co.

Ohio

• Ameritech

Pennsylvania

• AT & T Bell Laboratories

Rhode Island

• Metropolitan Electric Co.
• Narragansett Electric Co.
• Newport Electric Corp.

Tennessee

• Kingsport Power Co.

Texas

• El Paso Electric Co.
• Texas Utility Electric Company

Virginia

• Bell Atlantic
• Chesapeake & Potomac Telephone Co.

Wyoming

• Cheyenne Power Co.