If only there were some power source that is reliable and technologically mature; one could use it as a substitute for coal. Alas that such a thing must remain

If only there were some power source that is reliable and technologically mature; one could use it as a substitute for coal. Alas that such a thing must remain in fantasy. https://news.ycombinator.com/item?id=20254019 https://news.ycombinator.com/item?id=20254019