Dominion Energy said bills can vary from customer to customer based on electricity usage. Air conditioners can account for about half of a household's overall electricity usage, Dominion Energy said. According to Dominion Energy, how much higher individual electric bills get varies greatly from customer to customer based on electricity usage. As air conditioners run longer and work harder to keep homes comfortable, household electricity bills can skyrocket. "Higher bills are primarily driven by higher usage," said Aisha Khan, Media and Community Relations Manager for Dominion Energy.