ClimateWire: Whether it's electric cars or smoothing over the ever-shifting output from solar panels, saving and supplying electricity on demand is an important part of the technical solution to climate change. But as the technology inches forward, smartphones still struggle to make it through a whole day without charging up, battery-powered cars are too expensive or too limited in range for most consumers, and grid operators are still scratching their heads over how to price energy storage alongside power plants....