The cost of solar panels have really come down in price.  There are some interesting technology that is being proposed with batteries.  Also they now have solar disks that can also work at night or in low light.   I have read that before this decade is over with that 50% of the peak hours consumption of energy will come from solar.  The military is now in the process of installing panels at some of their bases.  The President is looking into installing them on all federal buildings.  He don't need permission from Congress on that.  

The Koch Bros. isn't going to hold back the tide on this.  Kursweil's Law is going to kick in because this is the right time and people are looking for relief from high energy bills.  IBM could not hold back personal computers and look were we are today.  As more homes switch to solar, the cheaper it will become. This will also lead to driving electric cars with charging done from home solar units. 

Another thing is crowd sourcing is financing home owners so they can install solar.  This is being done in California.  

The loans are administered by Mosaic, an Oakland, Calif., startup that made its name by letting ordinary investors – that’s you and me – put money into commercial and non-profit solar projects that were once the exclusive domain of big banks and corporations like Google. 

http://www.theatlantic.com/technology/archive/2014/04/why-your-neighbors-will-finance-solar-panels-for-your-roof/360680/

We are a long way from the days when Regan removed the solar panels off the White House after Carter had them installed in his term.