Constellation Energy Jumps on 20-Year Amazon Nuclear Deal

Constellation Energy (CEG) rose about 3.5% after a 20-year, 690 MW nuclear power deal with Amazon that backs a $3B+ Calvert Cliffs upgrade in Maryland.

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What Does the Amazon Deal Cover?

The agreement commits 690 MW of Calvert Cliffs output to Amazon for 20 years. Calvert Cliffs is Maryland's only nuclear plant, with two pressurized water reactors that came online in 1975 and 1976 and a combined output of about 1,790 MW. The plant supplies roughly 40% of the state's electricity and about 80% of its clean power.

Revenue from the contract supports a 190 MW uprate, meaning added capacity from equipment and efficiency upgrades at existing reactors. The new output is expected to come online between 2030 and 2032. Constellation and Amazon also signed a separate retail electricity supply agreement covering Amazon operations across the 13-state PJM Interconnection region.

Constellation chairman and CEO Joe Dominguez said the agreement supports the long-term operation of Calvert Cliffs and creates a foundation for future investment. Kerry Person, vice president of AWS Global Operations and Data Center Delivery, represented Amazon.

Why Did Constellation Shares Rise?

Shares rose because the contract converts uncertain merchant power prices into a long-dated revenue stream. The 20-year term gives Constellation the visibility to pursue a further 20-year operating license for both reactors. Without an extension, the units would shut in 2034 and 2036.

The move also recovered ground lost a day earlier. Shares fell after the Federal Energy Regulatory Commission imposed a five-month pause on PJM's reliability backstop procurement filing, which clouded the outlook for capacity pricing in the region. The Amazon contract offers a revenue path less dependent on that process. Broader markets were modestly firmer, with S&P 500 futures up about 0.3% and Nasdaq futures up about 0.6% in pre-market trading.

Why Does Amazon Want Nuclear Power?

Amazon needs firm, carbon-free electricity to run data centers for Amazon Web Services. Wind and solar output varies, while nuclear plants run around the clock at high capacity factors. That suits facilities with constant, growing loads from cloud and artificial intelligence workloads.

The deal follows a pattern in the sector. Constellation has agreements with Microsoft (MSFT), tied to the Crane Clean Energy Center in Pennsylvania, and with Meta (META). Hyperscalers are increasingly locking in generation directly instead of relying on grid purchases, which lets utilities and independent producers finance upgrades against contracted demand.

What Comes Next for Calvert Cliffs?

The next steps are regulatory and engineering. Constellation is expected to file for the license extension, which requires review by the Nuclear Regulatory Commission. The 190 MW uprate also needs approvals before construction ramps toward the 2030 to 2032 window. Constellation has also said it will explore building up to 2,000 MW of new next-generation nuclear capacity at the site.

Maryland stands to retain a plant that would otherwise leave the grid within a decade. Regulatory timelines and PJM market rules remain the main variables for execution.

Outlook

The Amazon contract strengthens Constellation's position as the largest US nuclear operator and extends its run of long-term deals with major technology buyers. The immediate share gain reflects both the revenue certainty and a rebound from the previous session's regulatory-driven drop. Key milestones ahead are the license extension filing, uprate approvals, and any further PJM rulings that affect capacity pricing.