It doesn’t look like much, but the straight line on the graph showing no reduction in electricity production means that the stacked silicon cells on the left are on the verge of changing the world. MK Nazeeruddin/EPFLOne of the last barriers to exceptionally cheap solar power has fallen, a paper in Nature Communications reports. A perovskite solar cell has been demonstrated to work for more than 10,000 hours without loss of performance, despite being exposed to conditions more grueling than on any rooftop. The work greatly increases the chances we will soon see solar panels producing power at prices fossil fuels could never match.