Just to stir up some shit: France is green because they have a lot of nuclear power. Which means a lot of energy for basically zero CO2. Germany could have been green, but opted to shutdown their nuclear facilities in what can only be described as a "hurt themselves in confusion" move.
These are not synchronous grids, but some other kind of boundaries. With synchronous grids the US should be split to only 3 zones, and most of Europe would be colored the same. So I think the kind of map you used is not the best for this joke.
World map of all synchronous grids:
From the website it sounds like that is a map of electric companies or something like that. So this map is not directly related to the Texas crisis. Most of these companies share electricity between each other.
The map is just bad? They're throwing large groups of states together that have literally no control over what other states do. For instance, it groups part of North Dakota, Minnesota, Wisconsin, Iowa, and Illinois together as if they're one giant blob and then saying they're only 10% renewable and 31% "low carbon" (whatever that means).
A quick look at Illinois shows it's 55% nuclear and 21.6% renewables for a grand total of 76% of their power being carbon free. Minnesota is 41% renewable, 25.3% nuclear, for a grand total of 66% carbon free electricity. Iowa is 90% (!!!) renewables. Even Wisconsin is 20% nuclear and 15.6% renewables.
However this map is being generated, it appears to be absolute garbage and intentionally skewed, and isn't basing any of this on any logic. It can't be based on population served or on size of ground covered.