Great points, great site. I would just note that those scores are near real-time, so they don't reflect the full picture for a country year-round (summer will have better scores than winter, and thus better than an annual score).

For instance, the Yukon Territory in Canada shows on electricitymap.org as 100% hydro with 24g Carbon Intensity score (and 3x that only 12 hours ago). Which is great, but a look during winter surely must be a different story. Having lived at a similar latitude, I know the water powering the hydro plants freezes up at some point during the winter months, at which time the small communities I've been in switch exclusively to diesel generators for part of the year (fuel for which is trucked in). Indeed, quick research of the power suppliers in Yukon (YEC/YECL) indicates several diesel generation facilities probably for exactly this purpose.