Energy Transition Siemens takes 45% in marine power firmEngineering giant Siemens has set its sights on commercialising marine energy after boosting its stake in a tidal power developer. November 4th 2011, 10:51 am 2 min read Facebook An icon of a facebook f logo. LinkedIn An icon of the LinkedIn logo. Twitter An icon of the Twitter logo. Engineering giant Siemens has set its sights on commercialising marine energy after boosting its stake in a tidal power developer.