The California Solar Index, which tracks new solar permits in major markets, declined 41% in the first quarter of 2017 from the same period in 2016. This downturn has likely contributed to the recent turmoil for the larger residential solar installers.
Though solar can supply electricity for a fraction of the cost of conventional sources, there are great fluctuations in the market prices. Roy L Hales of The ECOreport reviews price differences in New York.
A new report from NREL finds that we can get much more of our electricity needs from rooftop solar than was previously thought. That's not even taking into account ground-mounted and utility-scale solar.