Amazon and Constellation Energy sign 20-year nuclear power deal for Maryland plant expansion

Constellation Energy and Amazon have signed a 20-year power purchase agreement that will support the continued investment in and expansion of the Calvert Cliffs Clean Energy Center in Maryland, the companies announced on 30 September.

The agreement will enable more than $3 billion in Maryland infrastructure investment, including state-of-the-art improvements across the entire 1,790-megawatt plant and approximately 190 megawatts of new, emissions-free generating capacity scheduled to come online between 2030 and 2032.

The 20-year agreement covers 690 megawatts of power in total, including the 190-megawatt uprate. The parties have also entered into a related retail supply agreement to support Amazon’s operations in the 13-state PJM market. Amazon’s long-term commitment gives Constellation the revenue certainty to relicense the plant for another 20 years and to make progress toward developing new clean energy power plants at the site.

The deal will help Amazon manage its energy costs for facilities throughout the region. All electricity generated by Calvert Cliffs will continue flowing to the PJM regional grid, Constellation said, demonstrating how large energy users can support investment in new, reliable generation while strengthening the broader electric system.

“This agreement demonstrates how private investment can strengthen critical energy infrastructure,” said Joe Dominguez, chairman, president and chief executive officer of Constellation. “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.”

“Amazon is committed to investing in carbon-free energy to strengthen the grid and benefit the communities where we operate,” said Kerry Person, vice president of AWS Global Operations and Data Center Delivery. “This long-term agreement with Constellation sustains the continued operation and expansion of Maryland’s largest source of carbon-free energy, supports hundreds of jobs, and brings significant new generation to the regional grid.”

Calvert Cliffs, in Lusby on the western shore of the Chesapeake Bay, is Maryland’s only nuclear plant and produces approximately 80% of the state’s clean energy — enough electricity to power the equivalent of more than 1.3 million homes. The facility employs more than 800 people and contributes about $21 million annually in taxes supporting schools, roads and other public services.

The agreement is the latest sign of rising nuclear demand as technology companies seek dependable power for AI-driven computing infrastructure, Reuters reported. Barron’s noted Amazon had previously been looking to build data centres directly on the plant site but pulled its plans earlier this year after strong community pushback.

Sources

• Constellation Energy: 20-Year Power Purchase Agreement at Calvert Cliffs (30 Sep 2026)
• Reuters: Constellation, Amazon sign 20-year power deal to support Maryland nuclear plant
• Barron’s: Constellation Stock Rises as Amazon Backs Nuclear Plant Expansion
• Constellation: Calvert Cliffs Clean Energy Center