Norway has just opened up an interesting power plant. It's not a power source one would usually suspect when thinking about high-tech power plants. This one is powered by osmotic. What, you've never heard of it before? Well neither have I actually, but it sounds neat.
"The plant generates power by exploiting the energy available when fresh water and seawater are mixed. Osmotic power is a renewable and emissions-free energy source that Statkraft has been researching into for 10 years and that will be capable of making a substantial global contribution to eco-friendly power production."
"...the global potential of osmotic power is estimated to be 1,600-1,700 TWh per annum, equivalent to 50 percent of the EU's total power production" [Statraft]