Hillary has a vision on renewable power.  You can find it at https://www.hillaryclinton.com/briefing/factsheets/2015/07/26/renewable-power-vision .  And it's largely good common-sense stuff that probably should be done  --  if, of course, the Congress would cooperate and the money to act could be found.

One of Hillary's nicer visions is:  "Expand the amount of installed solar capacity to  140  gigawatts by the end of 2020, a 700% increase from current levels."  700% over four years works out to an increase by a factor of  1.68  a year.  But America's generated solar energy is, year-by-year, ALREADY increasing by a factor of  1.93 , and has been for the last five years!

You don't believe me?  Just go the Energy Information Agency's Electric Power Monthly (Table 1.1) and Do the Math!

All Hillary (or Donald) has to do is:  (i) keep stoking the present trend; and (ii) don't screw up.  Just keep this trend running until 2024, and America's average electric power needs can be meet  100%  by renewable generation!

Naturally, there are downsides to making America's electricity generation  100%  renewable by the end of 2024.  One is that doing so will require some really fast footwork by our manufacturing sector to provide both the solar panels and the infrastructure and the skilled work needed to make, install, and maintain all that generation.  Nevertheless, given that 36 of the last 46 Nobel Memorial Prize laureates in Economics have been American, surely there is enough brain power available to deduce correctly the steps that must be taken to overcome this challenge.

The next biggest challenge is that renewable electricity from either sunshine or wind is intermittent, while keeping our society running smoothly requires a precisely correct supply of electricity, not too much and not to little.  Because (i) the safe permanent storage of nuclear waste has been an unresolved problem for some seventy years while (ii) nuclear has remained pricey, the prospects of backing up energy from sun and wind with nuclear energy seem slim.  Besides, nuclear these days is more expensive than solar.  On the other hand, the front runners for massive electricity storage that might smooth out solar's intermittency have never been field tested at the scales needed.

William F. Pickard, older 'n' dirt, is a retiree (from Washington University in Saint Louis) who specializes in energy matters.  He's pretty much clueless as to how the crises confronting America might be surmounted.  But at least he has had the good grace not to stand for public office.