Comment by rossdavidh

Different places change at different rates. One thing that will happen, however, is that as some of the big coal customers switch, the economies of scale for coal production change, and it becomes even more expensive. So, coal will eventually become too pricey even for places like Poland, even though "Poland" does not bring to mind "summer skies where solar would be competitive" (I may be biased as I've only ever visited Poland around Christmastime).