Constellation Energy’s Calvert Cliffs Clean Energy Center in Lusby, Md., will add 190 megawatts to its current capacity under a new power purchase agreement (PPA) between the company and Amazon.
Amazon and Constellation announced this 20-year-long deal on Sept. 30. Constellation said the deal “will enable more than $3 billion in Maryland infrastructure investment, including state-of-the-art improvements across the entire 1,790-megawatt plant.”
The 190-megawatt uprate and improvements to the Calvert Cliffs plant are expected to come online between 2030 and 2032, according to the release. Additionally, in the partnership, Amazon pledged to help financially assist Constellation with securing a license renewal for Calvert Cliffs.
Calvert Cliffs, the sole Maryland nuclear power plant, generates around 1,790 megawatts of electricity between two large pressurized water reactors. Both Calvert Cliffs units secured their initial license renewal in 2000 and are due for a subsequent license renewal by the mid 2030s.
Unit 1 is licensed to operate through 2034, while Unit 2 is licensed through 2036.
“This agreement demonstrates how private investment can strengthen critical energy infrastructure,” said Joe Dominguez, Constellation’s chairman, president and CEO. “Amazon’s commitment supports the long-term operation of Calvert Cliffs for generations to come and creates a strong foundation for future investment in both the facility and in advanced nuclear technologies.”
Constellation secures another PPA this year to provide financial backing to its operating fleet. In June, Constellation and Walmart entered into a long-term agreement to support its Dresden Clean Energy Center in Dresden, Ill. and provide a 30-megawatt uprate to the plant.
In 2025, Constellation agreed to a 20-year PPA with Meta to support its Clinton nuclear plant in Illinois.
The company previously signed a PPA agreement with Microsoft in 2024 to facilitate its recommissioning efforts at the former Three Mile Island Unit 1 plant, now referred to as Crane Clean Energy Center. The Crane plant shuttered in 2019 primarily for economic reasons.