Sydney Morning Herald: Germany, the world leader in installing renewable energy, had a moment last month. It was producing so much electricity from solar, wind and biomass that more than half of the country's electricity was flowing from these renewable sources. There was so much, in fact, that the price of electricity actually fell to zero. And the price kept falling. It went negative. There were times on April 17 when wholesale electricity in Germany was selling for minus 14.91 euros for a megawatt hour. So it wasn't...