Things like that are in the making: <a href="http:&#x2F;&#x2F;www.technologyreview.com&#x2F;news&#x2F;544471&#x2F;renewable-energy-trading-launched-in-germany&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.technologyreview.com&#x2F;news&#x2F;544471&#x2F;renewable-energy...</a>