History of Electrification Sites - Edison Tech Center
1893: Redlands Mill Creek 1 powerhouse Redlands, CA 1893 The first 3-phase AC commercial power plant in the world. This used C.P. Steinmetz's improved 3-phase system. Transmission line length: 7 miles 1893: Hellsjon - Grangesberg, Sweden: developed by Ernst Danielson, he also was involved in the Mill Creek Plant at Redlands, California in the same year.