Duke Energy (NYSE:DUK) reported quarterly earnings of $1.93 per share which beat the analyst consensus estimate of $1.87 by 3.21 percent. This is a 9.66 percent increase over earnings of $1.76 per share from the same period last year. The company reported quarterly sales of $9.178 billion which beat the analyst consensus estimate of $8.433 billion by 8.83 percent. This is a 11.26 percent increase over sales of $8.249 billion the same period last year.