|Died||13 October 1918 (aged 74)|
|Known for||HVDC electricity distribution|
|Awards||Awarded membership, French Academy of Sciences|
Deprez was born in Aillant-sur-Milleron in rural France and attended the School of Mines in Paris. He was not able to complete the course; however, he must have made a good impression, as he was employed as a secretary to the Director of the school, Charles Combes.
At Creil, from 1876 to 1886, Deprez conducted the first experiments to transmit electrical power over long distances. At the International Exposition of Electricity, Paris, in 1881, Deprez undertook the task of presenting an electricity distribution system based on the long-distance transmission of direct current. The first successful attempt took place in 1882 from Miesbach to Munich at the occasion of the Exposition of Electricity in the Glaspalast organised by Oskar von Miller. There he transmitted 1.5 kW at 2 kV over a distance of 35 miles.
Deprez conducted experiments in La Chapelle, Grenoble, Vizille, Paris, and Creil. He eventually attained transmission over thirty-five miles for industrial purposes. In 1889, Rene Thury continued his approach of arranging generators in series, eventually developing commercial systems delivering 20 megawatts at 125 kV over 230 kilometers.
- Girolamo Ramunni. "Machines électriques". La Revue n°23 - Juin 1998 (in French). Musée des arts et métiers. Retrieved 2010-02-13.
- "Histoire de l'électricité. Distribution de l'énergie électrique par courant continu ou alternatif ?". Association S-EAU-S (in French). Retrieved 2010-02-13.
- "Marcel Deprez". Les grands noms de la houille blanche (in French). Les grands noms de la houille blanche. Retrieved 2010-02-13.
- "Image of Marcel Deprez". print sales website of the Science Museum, National Railway Museum and National Media Museum, incorporating the Royal Photographic Society Collection. Retrieved 2010-02-13.