The formidable achievement of Rutenberg was the "First Jordan Hydro-Electric Power House" at Naharayim on the Jordan River, which opened in 1930, and earned him the nickname "The Old Man of Naharayim". Other power plants were built in Tel Aviv, Haifa, and Tiberias, which supplied all of Palestine. Jerusalem was the only part of the Mandatory Palestine not supplied by Rutenberg's plants. The concession for Jerusalem was granted by the Ottoman Empire to Greek citizen Euripides Mavromatis. After Palestine was conquered by British forces, Mavromatis resisted Palestine Electric Company's attempts of building a power station that would serve Jerusalem. Only in 1942, when his British-Jerusalem Electric Corporation failed to supply the demands of the city, did the Mandatory government ask the Palestine Electric Company to take over the responsibility for supplying electricity to Jerusalem.