Key TakeawaysConstellation Energy and other nuclear stocks fell Monday as markets reacted to a new decision from regulators.A partnership between Amazon and Talen was rejected by regulators who said it could raise energy prices for customers in the surrounding area.Constellation also reported an earnings beat Monday, as the company will also likely face regulatory questions over its partnership with Microsoft. Shares of Constellation Energy (CEG) tumbled Monday morning despite an earnings beat as a recent r ...