No idea. The ‘typical meterological year’ is likely smooth some extremes - that will likely have less variance than any actual year. Maybe the geographical resolution is poor leading to more averaging. But that sounds a bit large of a difference to be just that. Was the total annual production way out?
Check some other tools , maybe a local one - another one might have better data on some things. Some consensus of several estimates might be better than relying on one calculator only.
Depends exactly how “modern” you mean, i guess. It seems like whatever humans would be doing is whatever the invincible alien overlords would either: permit; or, don’t care enough to stop.
Why would they come here (close enough) just to jam some radio? Is this an omicron perseiei VIII thing.
I prefer programs with the tite “World’s ‘blankiest’ ‘blank’.”