Amazon and Constellation Sign 20-Year Deal to Add 190 MW at Maryland’s Calvert Cliffs

# What happened

# Deal specifics The agreement covers two linked elements: long-term offtake of clean energy attributes and a retail supply arrangement that supports Amazon operations across the 13-state PJM market. The 690 MW commitment includes the existing output Amazon is contracting and the 190 MW increase Constellation plans to add through plant upgrades.

• Contract length: 20 years.
• Capacity covered: 690 MW total, including 190 MW uprate.
• Planned in-service window for the uprate: 2030–2032.
• Capital backing indicated: more than $3 billion in site investment.

# Why Constellation is moving forward

Joe Dominguez, Constellation's CEO, described the agreement as private investment that strengthens energy infrastructure and supports long-term operations and future investments at the plant.

# What Amazon gets Amazon secures a long-term source of carbon-free electricity and greater cost visibility for regional operations. The retail supply element ties Amazon's facilities in the PJM footprint to the contract, while the plant's output continues to serve the wider grid rather than being physically isolated for Amazon.

Kerry Person, VP of AWS Global Operations and Data Center Delivery, framed the contract as supporting continued operation and expansion of Maryland's largest source of carbon-free energy, sustaining jobs, and adding new generation to the regional grid.

# Grid and market context

# Local economic impacts Calvert Cliffs employs more than 800 people and contributes around $21 million a year in local taxes that support schools, roads, and public services. The planned investments and license-extension work are intended to preserve and potentially expand those local economic contributions.

# Timeline and next steps Constellation plans the uprate and related upgrades with a target for additional generation to enter service between 2030 and 2032. The contract's revenue support will be used to progress regulatory filings and capital projects needed to increase output and pursue relicensing.

# Bottom line The agreement links a major corporate buyer to a near-term program of nuclear investment, giving Constellation revenue certainty for upgrades and giving Amazon a long-term, carbon-free power supply across the PJM region. The arrangement keeps the plant's electricity available to the regional grid while channeling corporate finance toward infrastructure and license-extension work.