@duco @dalias I run a small fiber network and can confirm that in principle there’s very little marginal energy cost to traffic. Our peaks are in the 50–80 gigabits per second range and don’t really show up on router electricity usage graphs compared to the 10x smaller baseline.
That said, wireless is different. Also, much of the capacity is there specifically for video, so it’s not right to look at the marginal cost alone.