Some potentially positive developments in the cost of batteries to collect solar energy from home-based systems, which right now is holding back solar energy development. There is some real reason to think major developments are in the offing, including that the traditional energy providers are nervous about it. Of course, we’ve been hearing these sorts of predictions for almost 40 years now. I’m also a bit curious about the water requirements of a giant new battery factory in the deserts east of Reno. But that might be a secondary concern.