I am curious how hospitals and other big facilities will handle this that currently use diesel generators as a backup. Changing that to solar/batteries to powe

I am curious how hospitals and other big facilities will handle this that currently use diesel generators as a backup. Changing that to solar/batteries to power a large facility is a significant investment that I am having a difficult time picturing hospitals and other big facilities jumping on board. What are their plans for this? Or will the fuel always be available and affordable, just not new fossil fuel vehicles? When a majority of fossil fuel vehicles are gone, what happens to the price of diesel? Will there be exemptions for bio-diesel or other variants?