5-10% of your household electricity 10 % de votre facture d’électricité extra 10 percent extra 10 percent draw power whenever they’re plugged in strategies from the Department of Energy (DOE) 10 % de votre facture d’électricité vampire energy usage extra 10 percent Department of Energy 10 à 15 % de votre facture d’électricité 10 porciento adicional Departamento de Energía 25 electronic devices. the Department of Energy over 10% of your power bill energy bill by 10% 10 porciento adicional computer and phone chargers 4 Ways to Slay Energy Vampires this Halloween 4 tips to save energy around the house. U.S. Department of Energy energy.gov