There's no justification from a pure convenience standpoint, but I could respect the pettiness if the electric company ran their shit like one local government office in my hometown, where there was this small annual fee they charged like $9 for...but then to pay it, you could either mail in a check, hand deliver cash or check or card...or pay online...where they added a $5 "convenience fee" to a sub-$10 payment.

You bet your ass that I paid that shit in person every year, in loose change, and requested a receipt (which they had to write up manually because they didn't have a system to process and print one).