It's not 3.5kW. It's during the day more like 9 average. In summer, lots more than that. If the factory shuts down during the night, then in summer, it is considerably better than 3.5kW. (but plastering those same solar panels onto the roof would work considerably better still)
30,000 KWh over a year (8760 Hrs) is an AVERAGE of 3.42 Kw. May be PEAK of 9Kw (We don't know, all we know is it 30MWh/yr).
Seriously? People still assign public IP's directly to PC's? Get a router. use NAT. these "Port Scans" (which may well not be port scans at all) shouldn't be making it anywhere near a PC in the first place.
Seriously, did you research before posting ? UTM 9 IS a router and does NAT it is not a "PC"
Marriage is the triumph of imagination over intelligence. Second marriage is the triumph of hope over experience.