On September 30, 2026, Amazon and Constellation announce a 20-year power purchase agreement tied to the Calvert Cliffs Clean Energy Center in Lusby, Maryland. The agreement covers 690 megawatts (MW) of power, while about 190 MW is expected to be new generating capacity, with Constellation projecting that increase to come online between 2030 and 2032.
What the agreement covers
The deal links Amazon’s power purchase to investment and expansion at Calvert Cliffs. Constellation says it will enable more than $3 billion in Maryland infrastructure investment, including improvements across the existing 1,790-MW plant. The company also says the long-term commitment is expected to provide revenue certainty to support relicensing the plant for another 20 years.
| Agreement detail | Figure | What it describes |
| Agreement term | 20 years | Length of the power purchase agreement |
| Power covered by the agreement | 690 MW | Power included in the agreement |
| Expected new generating capacity | About 190 MW | An uprate Constellation expects online between 2030 and 2032 |
What the 690 MW and 190 MW figures mean
The 690 MW figure describes the power covered by the agreement, not the amount of new capacity. Constellation identifies about 190 MW as an uprate—an increase in the plant’s generating capacity—and expects that new capacity to come online sometime between 2030 and 2032.
Calvert Cliffs power remains on the PJM grid
Constellation says all electricity generated at Calvert Cliffs will continue flowing to the PJM regional grid. A related retail supply agreement is intended to support Amazon operations across PJM’s 13-state market.
AWS’s data-center proposal was separate
Amazon Web Services (AWS) had a separate proposal for a data-center campus at the site. Calvert County announced on August 4, 2026, that AWS had formally withdrawn its Calvert Technology Center application. County commissioners passed a six-month moratorium on data-center site-plan approvals on August 18; it took effect on August 28, 2026.
