Millions of Illinoisans could see higher energy bills next year, but how much higher will be determined by a state agency whose oversight powers recently were expanded. The state's four gas utilities and two largest electric utilities, which collectively serve 4.1 gas customers and 5.3 electric customers, are asking the Illinois Commerce Commission to increase rates. Electric utilities have asked to raise rates by a combined $2.8 billion over four years, while gas utilities have requested $890 million in increases next year.