There have been some interesting developments in solar technology over the last few years.
One in particular is the development of a battery back-up.
Elon Musk, who is part of SolarCity is building a massive manufacturing plant to produce these batteries.
I understand the inherent problems of solar and the affects it has on balancing the grid. Having a battery back-up system goes a long way to solve some of these issues.
Musk is a rent seeker. What he will do it is try to get the most government subsidies for his batteries just like Solar City sucks down taxpayer and ratepayer subsidies. I have some solar with no subsidies from either taxpayers or ratepayers. I also have batteries, one of the ways I do not get subsidies. Instead of "selling" overpriced power to the grid, needed or not, while getting power when ever I need (e.g. during solar eclipses, clouds and night) I use batteries.
My batteries cost a lot more than my panels. Musk will not make cheaper batteries, he will make expensive batteries that I will pay for through my taxes.