Nuclear-energy stocks slid after the Federal Energy Regulatory Commission shot down Amazon's plan to use more power from a Talen Energy nuclear reactor to fuel a data center. The decision is a sign that attempts by tech companies to hook projects up directly to sources of power could face obstacles from utility companies and regulators. Talen Energy, the company trying to sell more nuclear power to Amazon from the Pennsylvania plant, said the FERC ruling could have a chilling effect on similar projects, and that it is evaluating options.