31.8% return is amazing. In the United States the whole solar thing seems to be a cartel. I live in Arizona where the sunlight is plentiful. It is actually the best state in the United States to have solar but everyone has to be licensed to install the stuff. It is BS. They act like you can't do you own setup. If a person could source panels from China and cut out the middle man and do installation themselves it would be possible. If Elon Musk can get his battery packs out there cheap enough then true power independence in Arizona could be very possible and possibly economical.
If it's large scale. You have Melted salts,which I mentioned in the post. It is very,very cheap already....
someone just needs to do it. Like Germany. Yes some,resouces(coal) might be cheaper... in USD but costs Trilions in other effects of the world. We one have One world. Lets not "Mess Up".