The German industrial giant says it will “actively shape the commercialisation process of innovative marine current power plants” via the additional investment in MCT.

Siemens first bought a 10% stake in the firm in early 2010. Financial details of the new investment were not disclosed.

MCT, which hopes to develop its SeaGen tidal turbine into an industrial-scale operation, said earlier this year that it was looking for a heavyweight partner to help it achieve its goals.

“We