Almaria(n) W. Decker was an American electrical engineer involved in the early development of three-phase electrical power. In 1892 he was hired by H. H. Sinclair and Henry Fisher of the Redlands Electric Light and Power Company , a Californian generating company, to design a new three-phase generator (based on experimental work by Nikola Tesla) for the Mill Creek No. 1 hydroelectric plant. The plant opened in 1893 and is still in operation today (2004). This was the first commercial application of three-phase electrical power in the United States and probably the world. Its success led to the widespread adoption of three-phase power, in preference to single-phase and direct current.
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