# Amazon x Constellation Energy (Calvert Cliffs 20-year nuclear PPA): partnership

Canonical ID: `f23f1b55-6981-4d07-b672-b891d781049e`

Sep 30 2026 Constellation press: 20-year power purchase agreement with Amazon covering 690 MW from the Calvert Cliffs Clean Energy Center in Lusby, Maryland (1,790 MW plant), including approximately 190 MW of new capacity from a plant uprate expected online between 2030 and 2032. Enables more than $3 billion in Maryland infrastructure investment. Related retail supply agreement supports Amazon operations in the 13-state PJM market. Framed as supporting Calvert Cliffs relicensing and possible new clean-energy development at the site. Distinct from the older constellation-energy-x-aws clean-energy analytics partnership.

- **Type:** other
- **Status:** announced
- **Verification posture:** reported (press-release-only)

## Parties (2)

- [Amazon](https://registry.deploy.report/companies/amazon.md) customer
- [Constellation Energy](https://registry.deploy.report/companies/constellation-energy.md) technology provider

## Timeline

- **Announced:** 2026-09-30

## Sources (2)

1. https://www.constellationenergy.com/news/2026/09/constellation-and-amazon-announce-20-year-power-purchase-agreement-at-calvert-cliffs.html · 2026-09-30
2. https://www.streetinsider.com/Reuters/Constellation%2C+Amazon+sign+20-year+power+deal+to+support+Maryland+nuclear+plant/27129622.html · 2026-09-30


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