NewQ1 2026 Clean Energy Deal Intelligence Report is live
M&AClosedPress / newsJanuary 7, 2026

Calpine Corporation — 27 GW natural gas + geothermal fleet, creating 55 GW combined company

Constellation acquires Calpine in cash-and-stock deal (50M shares + $4.5B cash). Creates nation's largest power producer at 55 GW. FERC required divestiture of ~3.5 GW in PJM. Assumed ~$12.7B net debt.

$26.60B

Deal Value

27,000MW

Capacity

Geothermal

Technology

Multi-state

Location

Project: Calpine CorporationAsset profile →
MarketsGeothermal

Deal Details

Deal Type
Corporate M&A
Seller / Sponsor
Energy Capital Partners, Access Industries, CPP Investments
Buyer / Financier
Constellation Energy
Deal Value
$26.6B (stock + cash)
Stage
Operating
ISO/RTO
Multiple

Capital Structure

$26.6B

Total transaction value

Debt$12.7B44%
Equity$16.4B56%

Tranches

Stock Consideration · Constellation Energy (50M shares at $237.98 20-day VWAP)
$11.9B
Cash · Constellation Energy (cash on hand + Calpine cash flow)
$4.50B
Assumed Net Debt · Calpine Corporation
$12.7B
Senior Notes · Constellation Energy (issued to fund acquisition / retire Calpine debt)
$2.75B

Service Providers

Advisory & Legal

Seller Counsel
Latham & Watkins, White & Case
Buyer Counsel
Kirkland & Ellis
Seller Financial Advisor
Evercore, Morgan Stanley, Goldman Sachs, Barclays
Buyer Financial Advisor
Lazard, JP Morgan

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