It saves a lot of time to look at working examples. imho Vietnam is the best one to look at. It managed to get to more than eight times its grid capacity in installed solar in 18 months. It was done by the government promising guaranteed rates to all supplying power to the grid. They hoped for 850 MW, but got 18.5 GW, by folk building solar farms using loaned money. Their grid could only handle 2 GW, so they could only hook up a small fraction of the solar capacity at a time, resulting in no-one being able to pay back their loans. Of course they started to sue the government. The government has reacted by ordering some of the solar capacity to be dismantled, which obviously would be a very negative move, but it is presumably driven by the centralised grid-owning power companies, who wil be able to put a lot of pressure on the government, like they can in any country.
The technical solution (Answering your question no. 4), is to implement hydrogen electrolysers, dumping all of the collected energy to tanks as hydrogen, and have local microgrids around every installation powered 24/7 from fuel cells fed from the stored hydrogen, and to have hydrogen outlets for hydrogen fueled vehicle refueling around every installation, and to ship out excess hydrogen to places needing power or fuel, which are not local to the installations.... and scrap the grid, reclaiming the recyclable materials from that.
Of course the centralised grid-owning power companies will do everything they can to stop that, and they seem to be succeeding for now, but a lot of folk are watching, and taking notes.
On using less energy, I think we would significantly reduce naturally, by removing all industry dependent on the business of extracted energy, including even all "Green businesses" working on carbon taxes etc.
As to where everyone would work, why would we have to, with abundant free energy and fuel, I think only folk interested to do for the love of it would be doing it still, and they would do a much better job than anyone currently employed in "Bullshit jobs".
The people got the chance to vote, once before, when 4tn per month was being issued, they voted against oil in markets with their free money. I can't see why the same thing would not happen again, only this time it could be justified as money being issued to reflect the energy being received by solar farms, (which is actually donated, not extracted, therefore never officially monetised previously, because it can't be reflected by money-as-debt, which can only represent promises to extract).
Sorry long winded reply, but I hope it helps see how the whole solution, which I believe nature is forcing on us, by way of inflation, works.
We might liken money in that new scenario to the nutrients in a tree, transporting the energy recieved by the leaves, to all things needing it in Earth.
Of course it would work, we would simply be copying nature. Another interesting development towards that scenario is "Solein", which happens to be a hydrogen activated process. That would by us copying nature, creating food suitable for human consumption from the free energy of sunlight.
Further final point on the subject of human sustenance, a by-product of hydrogen fueled transportation is distribution of drinking water, which is produced in reasonable volume from vehicles consuming hydrogen (Solar farms need to collect the water in the first place, to feed hydrogen generation).
