When on a short shore escursion in Portland, Sth Australia last year, our bus driver who had worked at Port Headland smelting plant for many years, took us to see wind generators close up. His mate who has two on his property said they take about 25yrs to pay for themselves providing they have no breakdowns and are not real flash in calm conditions. He didn't care because what he was paid to have them on his land, paid for two real good holidays each year.
A few months ago in Sth West England you could see where so many farmers were no longer growing crops, and field after field was filled with thousands of solar panels. No doubt financially advantageous for the farmers, but to replace what was originally grown there, now has to be imported from somewhere else.
In many cases overcoming one shortfall in the supply chain, creates other problems of equal importance.