Guardian: The world’s first test plant to harness osmotic power, a new emission-free source of energy, opened on Tuesday, in Norway. Nestled amid pine-covered hills on the banks of the Oslo fjord, 60km south of the Norwegian capital, the facility will exploit the energy produced when fresh water meets seawater. Statkraft, the Norwegian energy firm behind the test plant, says osmotic power could produce up to 1,600–1,700 terawatt hours worldwide – the equivalent of half of the energy generated …