Умеэльвен
In the 1950s, hydroelectricity developments were building reservoirs and dams throughout the country (see also: energy in Sweden), but concerns were being raised against the environmental impact of these power plants. In particular, there were heated discussions about the developments on the Ume River and Vindel River. This led in 1961 an agreement called the Peace of Sarek (), which prevented development on some rivers of the Vindel River and in exchange gave freedom to develop the other rivers, including the Ume River. The Ume River has since been extensively cultivated for hydroelectric power.