Duke Energy (NYSE: DUK) reported quarterly earnings of $1.43 per share which beat the analyst consensus estimate of $1.30 by 9.16 percent. This is a 14.4 percent increase over earnings of $1.25 per share from the same period last year. The company reported quarterly sales of $7.592 billion which missed the analyst consensus estimate of $7.680 billion by 1.15 percent. This is a 1.12 percent increase over sales of $7.508 billion the same period last year.