Nuclear Atlas
Weekly digest
Companies · Nuclear, fuel and SMR · data

Constellation Energy Corporation

ConstellationUtility, fleet ownerListedHQ Baltimore, MD, United States

Profile

Constellation Energy is the largest nuclear operator in the United States. The reactor dataset (WNA/PRIS, 9 Oct 2026) lists 21 operating units at 12 sites under Constellation Energy Generation, LLC with 21,479 MWe net, from Braidwood and Byron in Illinois to Calvert Cliffs (Maryland) and Nine Mile Point (New York); the company also holds minority interests in Salem (PSEG operator) and South Texas Project (STP Nuclear Operating Co.), which are not counted here. stockanalysis.com (8 Oct 2026) gives about 31,676 MW of total generating capacity (a pre-Calpine description) and 15,339 employees; the USD 16.4 billion Calpine acquisition closed in January 2026 (Calpine release dated 7 Jan 2026; POWER Magazine cites about 55 GW combined). Recent dated events on the stockanalysis page: a 3.6 GW Google agreement including 890 MW of new nuclear in PJM (6 Oct 2026) and a 190 MW Calvert Cliffs PPA with Amazon (30 Sep 2026). The planned restart of Three Mile Island 1 as the Crane Clean Energy Center is tracked as a key project.

Source: stockanalysis.com NASDAQ:CEG quote page (fetched 9 Oct 2026); data/reactors.csv; Calpine/POWER Magazine (Jan 2026, headlines via search), 9 Oct 2026 · confidence high

Fleet

Reactors operated
21
Net capacity
21,479 MWe
As of
9 Oct 2026

Operated units only (operator string 'Constellation Energy Generation, LLC' in the reactor dataset); minority stakes in Salem and South Texas Project excluded.

Source: data/reactors.csv (WNA Reactor Database / IAEA PRIS as republished by WNA, as of 9 Oct 2026); operating units summed per operator/site

Key projects

Key projects from the company record; a map link appears where the project id is in a map dataset.
ProjectCountryStageNoteMap
BraidwoodUSAOperating2 operating units, 2,354 MWe netopen on the map
ByronUSAOperating2 operating units, 2,300 MWe netopen on the map
Calvert CliffsUSAOperating2 operating units, 1,732 MWe netopen on the map
ClintonUSAOperating1 operating unit, 1,062 MWe netopen on the map
DresdenUSAOperating2 operating units, 1,773 MWe netopen on the map
FitzpatrickUSAOperating1 operating unit, 813 MWe netopen on the map
LasalleUSAOperating2 operating units, 2,277 MWe netopen on the map
LimerickUSAOperating2 operating units, 2,268 MWe netopen on the map
Nine Mile PointUSAOperating2 operating units, 1,890 MWe netopen on the map
Peach BottomUSAOperating2 operating units, 2,631 MWe netopen on the map
Quad CitiesUSAOperating2 operating units, 1,819 MWe netopen on the map
R.E. GinnaUSAOperating1 operating unit, 560 MWe netopen on the map
Three Mile IslandUSARestart plannedTMI-1 restart as Crane Clean Energy Center; PRIS still lists the unit as permanently shut down (shutdown 20 Sep 2019); restart target year not verified this runopen on the map

Deals

Deals naming this company, newest first; each title links to its source. All deals.
DateTypeDealStatusCapacity MWValue
6 Oct 2026PPAGoogle and Constellation sign 20-year PPA for 890 MW of nuclear uprates on PJM gridSigned890n/a
30 Sep 2026PPAAmazon and Constellation sign 20-year PPA for 690 MW from Calvert Cliffs incl. 190 MW uprateSigned690n/a
1 Jun 2026Licensing milestoneFERC grants waiver letting Constellation move Eddystone interconnection rights to CraneCompleted835n/a
18 Nov 2025FinancingDOE closes USD 1 billion Energy Dominance Financing loan for Constellation's Crane restartSigned8351.0 bn USD
3 Jun 2025PPAMeta signs 20-year agreement for Clinton Clean Energy Center output (1,121 MW) from 2027Signed1,121n/a
20 Sep 2024PPAConstellation to restart TMI-1 as Crane Clean Energy Center under 20-year PPA with MicrosoftSigned835n/a
Source: deals.json, as of 9 Oct 2026; values as stated by each source, not converted.

Documents

Documents captured on the record: the latest documents and, where present, the technical report.
DocumentTypeDate
stockanalysis.com quote page (market cap, listing, employees, description)Quote page8 Oct 2026
Constellation completes Calpine transaction (Calpine Energy Solutions site)Press release7 Jan 2026
POWER Magazine: Constellation completes acquisition of Calpine; groups have 55 GW of generation capacityNewsJan 2026

Chart

TradingView symbol: NASDAQ:CEG
Market cap, USD
101.0 bn USDas of 8 Oct 2026 · stockanalysis.com
Market cap, local
n/a

Constellation Energy CorporationNASDAQ:CEG

Chart: TradingView, the same free embedded chart at the size of this view, with TradingView's prices under TradingView's terms; not part of the atlas dataset. Escape or Close returns to the page.

Chart: TradingView. The free embedded chart for NASDAQ:CEG loads from tradingview.com only when you press Show chart (needs JavaScript); it shows TradingView's prices under TradingView's terms and is not part of the atlas dataset. Expand opens the same chart in a larger view. While no chart is loaded, the figure shows the atlas dataset's dated snapshot instead.
Symbol: checked on TradingView, 10 Oct 2026. Primary listing (NASDAQ:CEG); verified via symbol page and screener, 10 Oct 2026; screener names it 'Constellation Energy Corporation' (stock).

All companies · All deals