Swedish clean tech companyMinesto already extracts one of the bigger energy sources of the future. At the moment, their award-winning tidal power plants are being tested in the ocean depths off the coast of Northern Ireland. Inside the prototype, HBM strain gauges play a key role in verifying how the plant behaves in the water and how it measures the forces to which it is exposed. Oceans cover 70 percent of the earth’s surface. This largely untapped energy source is the focus of Minesto, the largest marine energy company in the Nordics. In 2007, Minesto developed a new concept for tidal power called Deep Green.