In 1916, during the First World War, petroleum shortages led to a quickening of the electrical supply. On 3 March, electric streetlights shone for the first time. In 1923, the houses were connected to the new central waterworks. Postal bus service between Montabaur and Welschneudorf by way of Oberelbert was begun on 11 November 1926. Between 1926 and 1931, there was considerable building work in the community. In the Second World War (1939–1945), 38 Oberelberters lost their lives as a result of acts of war.