U.S. utility Talen Energy announced on Wednesday an expanded nuclear energy partnership with Amazon.com to supply up to 1,920 megawatts of electricity from its Susquehanna plant in Pennsylvania to Amazon Web Services (AWS) data centers.

Amazon says it will spend $20 billion on two data center complexes in Pennsylvania, including one it is building alongside a nuclear power plant that has drawn federal scrutiny.

Talen Energy (NASDAQ:TLN) +9.7% pre-market Wednesday after saying it has expanded its nuclear energy relationship with Amazon (NASDAQ:AMZN) to provide carbon-free energy from Talen’s Susquehanna nuclear power plant in Pennsylvania to Amazon Web Services data centers in the region.