Key TakeawaysDuke Energy beat second-quarter earnings and revenue estimates on higher rates and sales volumes, as well as favorable weather.The company's Electric Utilities and Infrastructure division posted a 28.2% year-over-year jump in income.Income from Duke Energy's Gas and Infrastructure unit tumbled as costs rose. Duke Energy (DUK) shares advanced after the utility company swung to a profit as it benefited from higher prices and sales volumes, as well as favorable weather conditions.  The North Carol ...