On July 12, 1929, the governorates and uyezds were abolished.[13] Udomelsky District, with the administrative center in Udomlya, was established within Tver OkrugofMoscow Oblast.[13] On July 23, 1930, the okrugs were abolished and the districts were directly subordinated to the oblast.[14] On January 29, 1935, Udomelsky District was transferred to newly established Kalinin Oblast.[13] In January 1961, Udomlya was granted work settlement status.[3] 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.[13] Between 1974 and 1984, the Kalinin Nuclear Power Plant was constructed.[10] On September 11, 1981, Udomlya was granted town status.[3] In 1990, Kalinin Oblast was renamed Tver Oblast.[15]
The main industrial enterprise in Udomlya is the Kalinin Nuclear Power Plant (98% volume of industrial production in Udomlya District, 70% of electric power produced in Tver Oblast and 2,5 % of goods and products of Tver Oblast). There are also enterprises of timber and food industries.[16]
Udomlya contains four objects classified as cultural and historical heritage of local significance, which are the Gudzovsky warehouse, built in 1882, a building where a Young Pioneer club was located, a monument to soldiers fallen in World War II, and a monument to Alexander Popov.[17]
There is a local museum in Udomlya.[18] The former Dacha Chayka on the shores of Lake Udomlya, located close to the town, which belonged to artist Vitold Byalynitsky-Birulya, is also open as a museum.[19]
Russian painters Alexey Venetsianov in the 19th century and Isaac Levitan at the turn of the 20th century lived and worked in the surroundings of Udomlya.
^ abcdLaw #34-ZO stipulates that the borders of the settlements (administrative-territorial divisions) are identical to the borders of the urban and rural settlements (municipal divisions), and that the borders of the administrative districts are identical to the borders of the municipal districts. Law #51-ZO, which describes the borders and the composition of the municipal formations in Udomelsky Municipal District, lists the town of Udomlya as a part and the administrative center of Udomlya Urban Settlement of that district.
Законодательное Собрание Тверской области. Закон №34-ЗО от 17 апреля 2006 г. «Об административно-территориальном устройстве Тверской области», в ред. Закона №66-ЗО от 1 октября 2014 г. «О внесении изменения в статью 18 Закона Тверской области "Об административно-территориальном устройстве Тверской области"». Вступил в силу со дня официального опубликования. Опубликован: "Тверские ведомости", №17 (специальный выпуск), 19 апреля 2006 г. (Legislative Assembly of Tver Oblast. Law #34-ZO of April 17, 2006 On the Administrative-Territorial Structure of Tver Oblast, as amended by the Law #66-ZO of October 1, 2014 On Amending Article 18 of the Law of Tver Oblast "On the Administrative-Territorial Structure of Tver Oblast". Effective as of the official publication date.).
Законодательное Собрание Тверской области. Закон №51-ЗО от 28 февраля 2005 г. «Об установлении границ муниципальных образований, входящих в состав территории муниципального образования Тверской области "Удомельский район", и наделении их статусом городского, сельского поселения», в ред. Закона №75-ЗО от 8 октября 2014 г. «О преобразовании муниципальных образований Таракинское сельское поселение Удомельского района Тверской области и Удомельское сельское поселение Удомельского района Тверской области и внесении изменений в Закон Тверской области "Об установлении границ муниципальных образований, входящих в состав территории муниципального образования Тверской области "Удомельский район", и наделении их статусом городского, сельского поселения"». Вступил в силу со дня официального опубликования. Опубликован: "Тверские ведомости", №10, 11–17 марта 2005 г. (Legislative Assembly of Tver Oblast. Law #51-ZO of February 28, 2005 On Establishing the Borders of the Municipal Formations Comprised by the Territory of the Municipal Formation of "Udomelsky District" and on Granting Them the Status of Urban, Rural Settlements, as amended by the Law #75-ZO of October 8, 2014 On the Transformation of the Municipal Formations of Tarakinskoye Rural Settlement in Udomelsky District of Tver Oblast and Udomelskoye Rural Settlement in Udomelsky District of Tver Oblast and on Amending the Law of Tver Oblast "On Establishing the Borders of the Municipal Formations Comprised by the Territory of the Municipal Formation of "Udomelsky District" and on Granting Them the Status of Urban, Rural Settlements". Effective as of the day of the official publication.).
Законодательное Собрание Тверской области. Закон №4-ЗО от 18 января 2005 г. «Об установлении границ муниципальных образований Тверской области и наделении их статусом городских округов, муниципальных районов», в ред. Закона №65-ЗО от 24 июля 2012 г. «О внесении изменения в статью 2 Закона Тверской области "Об установлении границ муниципальных образований Тверской области и наделении их статусом городских округов, муниципальных районов"». Вступил в силу через десять дней после официального опубликования. Опубликован: "Тверские ведомости", №3, 21–27 января 2005 г. (Legislative Assembly of Tver Oblast. Law #4-ZO of January 18, 2005 On Establishing the Borders of the Municipal Formations of Tver Oblast and on Granting Them the Status of Urban Okrugs, Municipal Districts, as amended by the Law #65-ZO of July 24, 2012 On Amending Article 2 of the Law of Tver Oblast "On Establishing the Borders of the Municipal Formations of Tver Oblast and on Granting Them the Status of Urban Okrugs, Municipal Districts". Effective as of the day which is ten days after the official publication.).
Президиум Верховного Совета РСФСР. Указ от 17 июля 1990 г. «О переименовании Калининской области в Тверскую область». (Presidium of the Supreme Soviet of the RSFSR. Decree of July 17, 1990 On Changing the Name of Kalinin Oblast to Tver Oblast. ).
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