PUT SILICON-PRODUCTION ON A WAR-FOOTING, RIGHT NOW!
The present obstacle in the way of the widespread use of solar power is the lack of refined silicon, because there are not enough silicon foundries producing it. But it is imperative that we shift off the Black Stuff (oil and coal) ASAP, for the good of the people of the earth. So, governments of the world, do your duty. Instead of subsidising all sorts of prattish projects and building bureaucratic empires, instead of pouring billions into defending your population against fictional foes, defend them against the real one--the global addiction to the Black Stuff. Pour billions into putting the production of silicon on to a war-footing: crash programmes all over the world to build armies of silicon foundries and get them up to full throttle ASAP.
Thus would people power, democratic-government power, break the obstacle down. Then there will be plenty of silicon for the solar-cell industry. And because the raw material will be supplied from public funds it will be cheap, making the finished product cheap. On top of that make sure the cost is pushed even lower--as low as possible--by giving solar-cell companies massive tax-breaks.
If all governments did that, they would truly be governments of the people, by the people, for the people, instead being for killer businesses, for anti-human international criminals like the Boys from the Black Stuff and the Big Iron carmakers.
Well, we can always dream...