Duke Energy ( DUK ) is one of the largest energy companies in the United States. The North Carolina-based company serves almost 9 million customers in its electric utilities division, with an additional 1.7 million customers served by its natural gas division. TheThe Investment Doctor is a financial writer, highlighting European small-caps with a 5-7 year investment horizon. He strongly believes a portfolio should consist of a mixture of dividend and growth stocks. He is the leader of the investment group E ...