[en] The paper gives an overview of fusion research in the world. The prospects for fusion as an energy source for the future are reviewed. Environmental compatibility, safety and resources are discussed. - Highlights: •Renewable energy sources need to be complemented by clean and environmentally friendly backup energy sources. •Controlled nuclear fusion has the potential to be a major player in future energy systems. •Magnetic fusion research is entering a new research phase with the construction of ITER, that, once in operation, will be the largest magnetic fusion device in the world.