Udomlya is a town and the administrative center of Udomelsky District in Tver Oblast, Russia, located on the shores of Lake Pesvo on the Rybinsk–Bologoye railway, 225km north of Tver, the administrative center of the oblast. Population:HistoryIt was founded in 1869 as a settlement serving the railway station of Troitsa . At the time, it was a part of Vyshnevolotsky Uyezd of Tver Governorate. Troitsa was renamed Udomlya in 1904.On July 12, 1929, the governorates and uyezds were abolished. Udomelsky District, with the administrative center in Udomlya, was established within Tver Okrug of Moscow Oblast. On July 23, 1930, the okrugs were abolished and the districts were directly subordinated to the oblast. On January 29, 1935, Udomelsky District was transferred to newly established Kalinin Oblast. In January 1961, Udomlya was granted work settlement status. In February 1963, during the abortive administrative reform by Nikita Khrushchev, Udomelsky District was merged into Bologovsky District, but in January 1965 it was re-established. Between 1974 and 1984, the Kalinin Nuclear Power Plant was constructed. On September 11, 1981, Udomlya was granted town status. In 1990, Kalinin Oblast was renamed Tver Oblast.