Unitil Energy Systems, Inc. (UES)   NH - 1901    Retail Electric Distribution Utility Fitchburg Gas and Electric Light Company (FG&E)   MA - 1852    Retail Electric & Gas Distribution Utility Unitil Power Corp. (Unitil Power)   NH - 1984    Wholesale Electric Power Utility Unitil Service Corp. (Unitil Service)   NH - 1984    Utility Service Company Unitil Realty Corp. (Unitil Realty)   NH - 1986    Real Estate Management Unitil Resources, Inc. (Unitil Resources)   NH - 1993...