XE ▼ -0.5% - X-Energy, Inc. $XE - Centrica, X-energy Advance Nuclear Plans as UK Regulators to Begin Design Review for Xe-100 X-Energy shares slipped 0.5% today following news that Centrica and X-Energy are advancing their nuclear partnership, with UK regulators set to begin a design review for the Xe-100 reactor. The regulatory milestone represents progress on the companies' joint effort to develop small modular reactor capacity in the UK. 15-SEP-2026 06:00 AM ET