A frowny face is not what most electric customers expect to see on their utility statements, but Greg Dyer got one.

He earned it, the utility said, by using a lot more energy than his neighbors.

“I have four daughters; none of my neighbors has that many children,” said Mr. Dyer, 49, a lawyer who lives in Sacramento. He wrote back to the utility and gave it his own rating: four frowny faces.

Two other Sacramento residents, however, Paul Geisert and his wife, Mynga Futrell, were feeling good. They got one smiley face on their statement for energy efficiency and saw the promise of getting another.

“Our report card will quickly get better,” Mr. Geisert wrote in an e-mail message to the Sacramento Municipal Utility District.