• Abbott Laboratories
• Ameren Corporation, AmerenCIPS, & AmerenUE
• American Electric Power
• Amoco Oil Company
• Chicago Metropolitan Water Reclamation District
• Chicago Transit Authority
• CNF Constructors
• Commonwealth Edison Company
• Consolidated Edison Company
• City of Dover, Delaware
• City of Peabody, Massachusetts
• CPC International
• Dayton Power and Light
• Florida Crushed Stone Company
• Fru-Con Corporation
• GD Searle and Company
• Hoosier Energy REC
• Indianapolis Power and Light
• Kansas City Power and Light
• Karachi Electric Supply Corporation
• Koppers Industries
• Madison Gas and Electric
• Massachusetts Bay Transit Authority
• Metropolitan Atlanta Rapid Transit Authority

• Meade Electric
• Miami Valley (Ohio) Regional Transit Authority
• Midwest Grain Processors
• Morgan Guaranty Trust Company
• Naperville Public Utilities
• Niagara Mohawk Power Corporation
• Northern Indiana Commuter Transportation District
• Northern Indiana Public Service Company
• O'Hare Airport
• Peabody Municipal Light
• Pfizer, Incorporated
• City of Philadelphia - Dept. of Public Property
• Phelps Dodge Corporation
• Riverbay Corporation
• S&C Electric Company
• Square D Corporation
• United States Navy
• Veterans Administration
• Washington Metropolitan Area Transit Authority
• Westpac Banking Corporation
• Wisconsin Electric Power Corporation
• Wisconsin Tissue Mills

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