Amazon signs a 20-year nuclear offtake at Calvert Cliffs

Constellation and Amazon said on 30 September 2026 that they struck a long-term deal around Maryland’s only nuclear plant, Calvert Cliffs.

Constellation’s release puts the power at 690 MW under a 20-year agreement, including about 190 MW of new generating capacity it says should come online between 2030 and 2032. It also says the agreement enables more than $3 billion of plant and related infrastructure investment, and that the parties signed a related retail supply agreement for Amazon operations across the 13-state PJM market. Calvert Cliffs power keeps flowing to the regional grid.

Amazon’s role is offtaker and retail customer, not a disclosed co-owner of the plant. Kerry Person, AWS’s vice president of global operations and data center delivery, is quoted on carbon-free energy and new generation for the regional grid. The release does not name an Amazon campus megawatt figure or a chip type for this deal.

Why it sits on the AI map: a hyperscaler is writing a multi-year nuclear offtake that also pays for an uprate. That is the power constraint the build-out keeps hitting. The new megawatts are still a 2030–2032 target.

Limits: uprate not online; $3 billion is plant investment, not Amazon capex; no campus MW in the primary release. No thesis-row status change. On the map, Constellation moves from no targeting signal to green. Amazon moves from gray to green; a prior minor signal does not color the company. Nothing turns red.

What would change the picture: uprate commercial operation disclosed; a named Amazon load figure tied to this offtake; or the agreement failing at relicensing or construction.