The globally known engineer and inventor Mikhail Dolivo-Dobrovolsky studied chemistry at the Riga Polytechnicum for 3 years. Later, he went to Germany and worked for AEG company. During that time, he has invented and constructed the first three-phase alternating current generator with rotating magnet field capacity of 2.2 kW. During the World Electrotechnical Exhibition in Frankfurt, in 1891, for the first time ever he demonstrated transfer of three-phase electric power on long distances. The demonstration of the effectiveness of three-phase power marked the end of discussions about most suitable currents. This invention marked a significant turning point in the history of technology and was one of the most important events in the history of electricity.