Vested power barons argue that we continue needing their fossil fuel- and nuclear-powered plants to guarantee the supply of electricity. Their arguments: The sun doesn’t always shine, the wind doesn’t always blow, and renewable energy projects are small scale and unreliable at times of high power demand. However, the naysayers underestimate technology. A group of farmers and a tech company in Germany are creating a reliable power network by connecting hundreds of small-scale biogas generators into something that to the grid looks like one huge power station.