Amazon's ambitious plans to power its datacentres with nuclear energy have hit a major roadblock. The USA’s Federal Energy Regulatory Commission (FERC) has rejected a proposal to increase power supply from Pennsylvania's Susquehanna nuclear plant to an Amazon datacentre, citing concerns about grid reliability and cost implications.

The Federal Energy Regulatory Commission (FERC) rejected an effort Friday to allow an Amazon data center to tap into additional power from a nearby Pennsylvania nuclear plant. The decision could throw a wrench in efforts by large technology companies to secure so-called “behind the meter” power from nuclear plants as they seek to meet

The commission agreed with opponents of the proposal, citing concerns about grid reliability and cost fairness.