---
schema_version: "secwatch.filing_event.v1"
accession: "0001168165-26-000005"
form_type: "8-K"
ticker: null
cik: "0001168165"
company_name: "CONSTELLATION ENERGY GENERATION LLC"
filed_at: "2026-01-08T23:59:59+00:00"
generated_at: "2026-05-16T11:10:25.614294+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Constellation Energy Generation issues $2.75B in senior notes to retire Calpine debt

## Summary
- Issued $300M Floating Rate Senior Notes (SOFR+60bps) due 2028, $900M 3.900% notes due 2028.
- Also issued $750M 4.400% senior notes due 2031 and $800M 5.875% senior notes due 2066.
- Proceeds used to retire outstanding Calpine LLC indebtedness after completing Calpine acquisition.
- Interest on floating rate notes payable quarterly; fixed-rate notes pay semi-annually starting July 2026.
- 2031 and 2066 notes are optionally redeemable; floating and 2028 notes non-redeemable before maturity.

## SEC filing metadata
- accession: 0001168165-26-000005
- form_type: 8-K
- cik: 0001168165
- company_name: CONSTELLATION ENERGY GENERATION LLC
- filed_at: 2026-01-08T23:59:59+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 1.01, 2.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1168165/000116816526000005/0001168165-26-000005-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1168165/000116816526000005/ceg-20260108.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001168165-26-000005
- JSON: https://secwatch.observer/filing/0001168165-26-000005.json
- Plain text: https://secwatch.observer/filing/0001168165-26-000005.txt

## Key facts
- Debt Financings
  CONSTELLATION ENERGY GENERATION LLC incurred senior notes of $300,000,000 with U.S. Bank Trust Company, National Association at Compounded SOFR plus 60 basis points maturing January 8, 2028.
  - Instrument: senior notes
  - Principal: $300,000,000
  - Counterparty: U.S. Bank Trust Company, National Association
  - Rate: Compounded SOFR plus 60 basis points
  - Maturity: January 8, 2028
  - Event: incurrence
  source text: Business and Operations Item 1.01. Entry into a Material Definitive Agreement On January 8, 2026, Constellation Energy Generation, LLC (Constellation) issued and sold $300,000,000 in aggregate principal amount of Floating Rate Senior Notes due 2028 (the Floating Rate Senior Notes), $900,000,000 in aggregate principal amount of 3.900% Senior Notes due 2028
  evidence_url: https://www.sec.gov/Archives/edgar/data/1168165/000116816526000005/0001168165-26-000005-index.htm
- Material Agreements
  CONSTELLATION ENERGY GENERATION LLC entered into Senior Notes valued at $300,000,000 in aggregate principal amount of Floating Rate Senior Notes due 2028, $900,000,000 in a (effective 2026-01-08).
  - Action: entry
  - Agreement: notes offering
  - Value: $300,000,000 in aggregate principal amount of Floating Rate Senior Notes due 2028, $900,000,000 in a
  - Effective: 2026-01-08
  source text: On January 8, 2026, Constellation Energy Generation, LLC (Constellation) issued and sold $300,000,000 in aggregate principal amount of Floating Rate Senior Notes due 2028 (the Floating Rate Senior Notes), $900,000,000 in aggregate principal amount of 3.900% Senior Notes due 2028 (the 2028 Senior Notes), $750,000,000 in aggregate principal amount of 4.400% Senior Notes due 2031 (the 2031 Senior Notes) and $800,000,000 in aggregate principal amount of 5.875% Senior Notes due 2066 (the 2066 Senior Notes, and collectively with the Floating Rate Senior Notes, the 2028 Senior Notes and the 2031 Senior Notes, the Senior Notes).
  evidence_url: https://www.sec.gov/Archives/edgar/data/1168165/000116816526000005/0001168165-26-000005-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.