Support this work for $1 a monthNiagara Mohawk Power Corp. said it hired investment banking firm Goldman, Sachs & Co. to help sell its omg-Co Enterprises Inc. unit.Niagara Mohawk said it decided to sell the unit after evaluating recent changes in the unregulated power business in New York and elsewhere.omg-Co develops and operates electric generating power plants. The unit owns 14 hydroelectric facilities, five co-generation plants, four biomass plants and an interest in two wind-power facilities. None of the operations is in Western New York.Get local news delivered to your inbox!* I understand and agree that registration on or use of this site constitutes agreement to its user agreement and privacy policy.