A corporate offtake of this size underwrites an upgrade at Maryland’s largest carbon-free plant and ties Amazon’s PJM load to existing nuclear output plus capacity that is not yet built.
IN BRIEF: Amazon said on September 30, 2026, that it is working with Constellation Energy on a long-term agreement covering 690 megawatts at the Calvert Cliffs Clean Energy Center in Calvert County, Maryland, including 190 megawatts of new carbon-free capacity expected online between 2030 and 2032.
Amazon is investing in carbon-free energy in Maryland through a long-term commitment with Constellation Energy that the company says will keep the state’s largest source of carbon-free energy running for decades and help add new capacity to the grid. The arrangement centers on the Calvert Cliffs Clean Energy Center in Calvert County. Amazon describes the plant as producing about 80 percent of Maryland’s carbon-free energy, enough to power more than 1.3 million homes.
The commercial instrument is a long-term agreement that includes 690 megawatts of power and supports an expansion of Calvert Cliffs’ generating capacity. Amazon and Constellation have also entered into a related retail supply agreement to support Amazon operations across the PJM market, which manages the electric grid across 13 states and the District of Columbia. The energy the plant produces will keep flowing to the regional grid that serves Maryland and neighboring states, on the same terms the company says apply today. For an enterprise buyer, the structure separates grid delivery from the retail supply that covers Amazon’s own load inside PJM.
The incremental capacity is specific. Amazon’s long-term commitment helps Constellation invest in upgrading the plant, adding 190 megawatts of new carbon-free power, enough to power about 147,000 U.S. homes. That new capacity is expected to come online between 2030 and 2032. The commitment also lays the groundwork to explore next-generation nuclear technology at the site, and the two companies are exploring ways to generate still more carbon-free energy there, including new nuclear units. None of that later capacity is described as contracted or scheduled. The 190 megawatts is the only new volume tied to a date window, and that window is an expectation, not a commercial operation date.
Constellation Energy, a Maryland-based company that has operated Calvert Cliffs for decades, is the counterparty. Joe Dominguez, chairman, president, and CEO of Constellation, said: “This agreement demonstrates how private investment can strengthen critical energy infrastructure. 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’s post does not quote an Amazon executive on the deal.
Amazon frames the commitment against its existing footprint in the state: a long-term investment of more than $20 billion since 2010, supporting more than 33,000 direct and indirect jobs across Maryland. At the plant itself, the company says the commitment protects about 850 skilled, well-paying jobs, many of them union jobs that anchor the local economy. Calvert Cliffs is described as one of the most reliable sources of carbon-free energy in the region, running around the clock to deliver steady, always-on power. Those operating claims are Amazon’s characterization of the existing plant, not a new performance guarantee disclosed in the post.
The announcement sits inside a broader Amazon sustainability update on carbon-free purchases. The page presents Amazon as a leading corporate purchaser of carbon-free energy, with more than 700 projects globally totaling more than 40 gigawatts, spanning solar, wind, battery storage, and nuclear. The Calvert Cliffs item is one entry in that sequence. It does not disclose contract price, term length in years, regulatory approvals still required, or the share of the 690 megawatts that is existing output versus the 190 megawatts still to be added. Founders and investors reading the post for offtake precedent therefore have volume, location, counterparty, a 2030–2032 window for the new megawatts, and a PJM retail supply agreement, and they do not have price or tenor.
WHY IT MATTERS: The reported structure lets a large buyer underwrite both continued operation of an existing nuclear station and a defined capacity uprate, while keeping the plant’s output on the regional grid and covering its own PJM load through a separate retail supply agreement. The analytic weight sits on the 190 megawatts expected between 2030 and 2032; anything beyond that, including next-generation units, is exploration rather than committed capacity.
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