Almost 20%, is that respectable? Just a bit behind Nuclear.
Not really considering that most of it is subsidized.
But that aside, being that we already have wind and solar in the prime spots, everything that would come after that would be diminishing marginal returns. Not economically speaking, but in terms of power generation.
There would come that point where you would put solar in say, Seattle and barely bump up the generation capacity because it's so cloudy and rainy there. Or some place like Florida for wind.
You'd arrive at that plateau point long before you'd cover demand.
So do I call it respectable, in terms of base load reliability? No.