Constellation and Amazon announce 20-year nuclear PPA

Constellation and Amazon have announced a 20-year power purchase agreement supporting a 190 MW nuclear uprate and broader expansion at Calvert Cliffs Clean Energy Center in Maryland.

• The agreement covers 690 MW of power, including a 190 MW uprate, and is tied to a related retail supply agreement for Amazon operations in the 13-state PJM market.
• Constellation says the deal will enable more than $3 billion in Maryland infrastructure investment, with new emissions-free generation expected online between 2030 and 2032; the site remains connected to the PJM regional grid.
• This appears to be a first-time announcement of the agreement, issued as a press release by Constellation on 2026-09-30.