As millions of Americans huddle around TVs with friends and family this Sunday to watch the Super Bowl, they’ll neglect their laundry, skip vacuuming the carpet and abandon just about anything else that requires electricity, according to a new study. As a result, energy usage will plummet.

During the 2012 Super Bowl, which ranked as the most watched television broadcast in U.S. history with 111.3 million viewers, energy usage dropped 5 percent in the Western U.S. and 3.8 percent in the East, energy software company Opower reported.