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Constellation and Amazon Sign 20-Year Deal to Back Calvert Cliffs Nuclear Upgrade

The agreement gives Constellation revenue certainty to fund roughly $3 billion in plant improvements that aim to boost output, support relicensing, and explore small modular reactors.

US' powerful nuclear reactor to get 190 megawatts more emissions-free power generating capacity with new deal.
The Calvert Cliffs Clean Energy Center, Constellation’s nuclear power plant is located on the western shore of the Chesapeake Bay in Lusby, Maryland.
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Overview

  • The companies signed a 20-year power purchase agreement on Wednesday that secures 690 megawatts of capacity from Calvert Cliffs and includes a related retail supply contract for Amazon in the 13-state PJM market.
  • Constellation says the Amazon commitment enables about $3 billion in equipment and site upgrades and will add roughly 190 megawatts of emissions-free capacity between 2030 and 2032, bringing the plant from 1,790 MW to about 1,980 MW.
  • The deal is intended to provide the long-term revenue certainty Constellation needs to pursue relicensing of Calvert Cliffs’ two reactors, whose current licenses expire in 2034 and 2036, and to justify further investment decisions.
  • Power generated at Calvert Cliffs will continue to flow into the PJM regional grid for all customers rather than being delivered directly to Amazon facilities, while Amazon secures long-term price and supply certainty through the contract.
  • The pact follows local resistance to a proposed on-site hyperscale data center and positions Calvert Cliffs as a potential site for advanced nuclear projects, including evaluation of small modular reactors, with regulatory approvals still required.