•    Verizon
•    National GRID
•    CON EDISON
•    Long Island Power Authority
•    Port Authority New York City
•    Orange and Rockland Utilities
•    Central Hudson Gas and Electric
•    New York State Electric and Gas
•    Rochester Gas and Electric
•    William A. Hazel Incorporated
•    Loudoun Water
•    KeySpan Energy
•    Brooklyn Union Gas
•    Metro-North Railroad
•    JEA-North Florida Electric, Water, and Sewer
•    Marion Utilities
•    Dutchess Country Sewer and Water Authority
•    Fuss and Oneill Corp.
•    Joken Construction Group
•    Haley Aldrich
•    W Harris and Son. Inc.
•    Sambol Construction
•    Henkel's and McCoy. Inc.
•    Kemsco Construction and Equipment Company, Inc.
•    PDVSA
•    Felix Associates of Florida, Inc.
•    Brierley Associates
•    New York American Water Company
•    John P. Picone Incorporated
•    Suffolk County Water Authority