Key Takeaways Nuclear energy stocks soared Wednesday after the largest electrical grid operator in the U.S. said prices at its power market auction increased ninefold year-over-year. Constellation Energy, which operates the largest collection of nuclear plants in the country, saw its shares jump more than 12%, while Vistra shares gained nearly 15%. Both companies are expected to report second-quarter earnings next week. Shares of nuclear energy stocks soared Wednesday after the largest electrical grid opera ...