As a result of the hazards of nuclear power plants and their waste, became the first country to order all of its nuclear power plants to shut down by 2020.

The answer is; "Germany".
Germany became the first country to order all of its nuclear power plants to shut down by 2020.
An atomic power plant or atomic power station or nuclear power station refers to a thermal power station, and these stations nuclear reactor is used as the source of heat. Typically in all conventional thermal power stations the heat is utilized to create steam which drives a steam turbine associated with an electric generator which produces power or electricity.