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If they get to a point where solar can supply more than the total grid demand at any point in the day-night cycle, then storage becomes a concern. Until that happens, there is no point storing anything.
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Solar is great....
....for small-scale, local grids, where "dark-time" storage is feasible (whether that's your Tesla PowerWall in the garage or a molten-salt setup for keeping the small town's lights on at night).
The massive solar farms that are being heavily subsidized to add day-only capacity to the larger grids.....hilariously inefficient. There isn't remotely any "dark-time" storage capacity to keep that power flowing at night.
Good for your house. Good for a small town. Idiotic for large-scale generation (absent some as-yet-undemonstrated super-large-scale storage mechanism).
If they get to a point where solar can supply more than the total grid demand at any point in the day-night cycle, then storage becomes a concern. Until that happens, there is no point storing anything.
So, just for my luddite clarity, the vision here is:
1) Build enough solar power generation capability to match current power generation capability across the entire nation to support us during all hours. The common wisdom here is that it will take 21,250 square miles of just solar panels, of course you are going to want to maybe double that to cover the access roads, power substations and extra capacity we will need to ensure that we make power on cloudy days and account for power line transmission inefficiencies and other things.
2) Build out how ever many billion pounds of batteries that we will need then to power the entire united states at night.
3) De-commission all other, "non-green" power plants that have been sitting there running while we were building 42,500 square miles of solar panels and ensuring we have power through the entire process.
4) Don't forget to hire an army of people to maintain all that infrastructure we created, to clean the panels from dust/dirt/snow and to replace batteries/panels as necessary, there will be a measurable loss every year of both(1%, 5%, it'd just be a guess on my part) due to wind, hail and other acts of God in addition to plain old manufacturing defects, wear and a need to replace the panels on a rolling schedule to prevent them all coming up on their end of life all at once.
Side note: Every step of 1 and 2 will be insane profit to China as they own most of the rare earth mineral production in the world necessary to make panels and batteries. They have been positioning themselves on that front for at least a decade and are most likely behind all the push we see for things like the Paris accords and the green new deal. We will obviously never be able to compete with them on the homefront pricewise with them using a healthy combination of currency manipulation and slave labor to make the prices most attractive (greasing palms sure doesn't hurt them either).
See I feel that it's ironic that I get called a luddite for wanting to use the power of splitting, or ideally fusing, atoms to make our energy by people that want to rely on warmed over ancient forms of power like wind and solar that man has been using to heat water and power mills for thousands of years instead.