> With solar and wind being so competitive on price (both per MW and MWh) I don't understand why there's not more of it.

You need to be a bit more patient. solar / wind have been growing double digit percentages (from the top of my head something like 20-30%) p.a. now for some time. Just to compare, iPhone had never two consecutive full production years that would have had triple digit growth. And arguably increasing production capacity for energy infrastructure is more difficult than for a phone. So the 20-30% p.a. growth is likely the best we can have, and I'd argue even that is explosive. Given current growth rates, majority of electricity production should be solar/wind within the next decade or so.