Britain’s plan to expand nuclear power is central to its energy security strategy, but escalating costs, regulatory hurdles, and project delays threaten to undermine its ambitions.

Britain’s plan to expand nuclear power is central to its energy security strategy, but escalating costs, regulatory hurdles, and project delays threaten to undermine its ambitions.

In 2025, the U.K. was deemed the “most expensive place in the world” to build nuclear power plants in a government review...