 It was a key event in the history of AC power, as Westinghouse demonstrated the safety, reliability, and efficiency of a fully integrated alternating current system to the American public.Westinghouse's demonstration that they could build a complete AC system at the Columbian Exposition was instrumental in them getting the contract for building a two-phase AC generating system, the Adams Power Plant, at Niagara Falls in 1895.At the same time, a contract to build the three-phase AC distribution system the project needed was awarded to General Electric.