Globally, PC gamers use about 75 billion kilowatt hours of electricity a year, equivalent to the output of 25 electric power plants. (And that doesn’t include console games.) In the United States, games consumes $6 billion worth of electricity annually — more power than electric water heaters, cooking appliances, clothes dryers, dishwashers, or freezers. And more power means more greenhouse gas emissions: American gamers emit about 12 million tons of carbon dioxide annually — the equivalent of about 2.3 million passenger cars.
— source grist.org | Dec 1, 2018