10 Historical Energy Events in the U.S. By kevinthomas Mar 18, 1835 Joseph Henry invented the electrical relay, used to send electrical currents long distances. Jun 25, 1837 Thomas Davenport invented the electric motor, Jun 25, 1844 1844 Samuel Morse invented the electric telegraph Jun 25, 1886 William Stanley developed the induction coil transformer Jun 25, 1896 Powerline in Niagra falls, Buffalo NY Jun 25, 1900 Highest voltage transmission line 60 Kilovolt. Jun 25, 1911 Electric air conditioning – W. Carrier. Jun 25, 1935 Public Utility Holding Company Act. Federal Power Act. Jun 25, 1947 Transistor invented by scientists at Bell Telephone Laboratiories. Jun 25, 1957 Shippingport Reactor in PA; 1st nuclear power plant
