In May, 1893, The Columbian Exhibition opened in Chicago with illumination inside and out supplied by the Westinghouse Company using Tesla technologies. The Westinghouse installation was "outshining" Edison's lighting efforts and Tesla supplied a spectacular personal rebuttal to Edison's claim that AC current was by nature too dangerous for everyday use.Read also:
Since Tesla's first introduction of AC electricity, the "War of Electric Currents" had been waged, with Edison insisting on the safety of DC current over AC current. The safeness in fact came from the minimal strength of the direct current.
Now Tesla disproved that claim by letting a charge of one million volts be passed through his body without harm. Alternating current had won the "War".
Westinghouse also used the Tesla polyphase system in harnessing the power of Niagara Falls to produce 37,300 kilowatts electrical output from ten generators and transmit it to Buffalo, which was twenty-two miles away. The system went online in August, 1895.
(from Tha case files: Nikola Tesla)
Tesla vs Edison: the war of currents
The Current War: Edison and Tesla Fight Over How to Power the World
War of the currents by Saša Stojanović
Wikipedia: War of currents