Personally I quite like the polar coordinates, though it's a pity that by convention, a watch face only holds half a day, as we would otherwise have a nice mapp

Personally I quite like the polar coordinates, though it's a pity that by convention, a watch face only holds half a day, as we would otherwise have a nice mapping of generation time to a watch-face equivalent. My nitpick is that this is ultimately a stacked bar chart, so as with cartesian stacked charts, it obfuscates some of proportions, in particular the very interesting cyclicity of renewables. The author has wisely put the higher-variance variables first, mitigating the problem somewhat, but not completely, as can be seen by comparing to the gridwatch UK equivalent.