Constellation Q2 2026 earnings: Adjusted EPS rises despite lower GAAP profit

Constellation Energy (Nasdaq: CEG) reported Q2 2026 revenue of $7.504 billion, up 23.0% from $6.101 billion a year earlier, while GAAP diluted EPS fell to $1.42 from $2.67. Adjusted operating EPS increased to $2.55 from $1.91, as the addition of Calpine and favorable market and portfolio conditions were partly offset by unfavorable nuclear outages.

Core earnings data

For the quarter ended June 30, 2026, operating expenses increased faster than revenue. GAAP operating income consequently declined to $580 million, with operating margin contracting to approximately 7.7% from 15.6%.

The adjusted results moved in the opposite direction. Adjusted operating earnings rose to $920 million, highlighting the effect of fair-value adjustments, Calpine-related items and other expenses excluded from the company’s non-GAAP measure.

The increase in diluted shares helps explain why adjusted earnings grew faster than adjusted EPS. The GAAP effective tax rate also rose to 44.2% from 34.6%, adding pressure to reported net income.

Business and operating performance

Constellation’s nuclear fleet produced 44,160 GWh during the quarter, down approximately 2.2% from 45,170 GWh. Excluding Salem and the South Texas Project, the nuclear capacity factor decreased to 93.0% from 94.8%.

Planned refueling outage days at company-operated sites increased to 86 from 41, consistent with management’s identification of unfavorable nuclear outages as a partial earnings offset. Non-refueling outage days declined slightly to 20 from 22.

Following the January 2026 Calpine acquisition, Constellation began reporting an equivalent forced outage factor for its natural gas, oil and pumped-storage hydro fleet. The Q2 figure was 6.2%, with no prior-year comparison provided. Renewable energy capture was nearly unchanged at 96.0%, compared with 96.1% one year earlier.

The company also signed an additional 920 MW of nuclear power purchase agreements with investment-grade customers. The contracts run for 15 to 20 years and are scheduled to begin between 2029 and 2032. A 176 MW agreement with Walmart is expected to enable a 30 MW expansion at the Dresden Clean Energy Center.

Calpine lifted adjusted earnings while GAAP costs compressed reported profit

The quarter’s central issue was the divergence between GAAP and adjusted performance. Revenue increased by $1.403 billion, but operating expenses rose by $1.776 billion, reducing GAAP operating income despite the larger business platform.

The reconciliation from $513 million of GAAP net income attributable to common shareholders to $920 million of adjusted operating earnings included a $340 million after-tax unrealized fair-value loss, $149 million of after-tax noncash amortization on commodity contracts acquired with Calpine and $84 million of after-tax Calpine merger and integration costs. These additions were partly offset by a $221 million decommissioning-related adjustment that was subtracted from GAAP earnings in arriving at the adjusted result.

These items show why adjusted operating earnings captured the benefit of Calpine and favorable commercial conditions more clearly than GAAP net income. They also mean investors need to evaluate both measures rather than treating either one as a complete view of the quarter.

Earnings guidance

Constellation raised its full-year adjusted operating EPS outlook to $11.50-$12.50. The prior range was not included in the supplied release, so the size of the increase cannot be quantified.

The company did not provide a GAAP reconciliation for this outlook, citing uncertainty around future fair-value adjustments involving derivatives and securities held by nuclear decommissioning trusts.

Strategic and regulatory developments

Constellation cleared two milestones for the planned Crane Clean Energy Center restart. FERC approved the transfer of existing capacity interconnection rights, while the NRC approved a fuel license amendment request. The company continues to target a restart in 2027.

After the quarter, Constellation agreed to sell the 606 MW Brazos Valley Energy Center to LS Power for $860 million before closing adjustments. The transaction is the final asset sale required under regulatory commitments associated with the Calpine acquisition, but it remains subject to Department of Justice approval and other closing conditions. Constellation expects it to close by the end of 2026.

The company also applied to extend the operating licenses of Ginna and Nine Mile Point Unit 1 by 20 years, through 2049. Approval remains pending.

Recent insider transactions

The supplied insider data show no open-market purchases or sales over the previous six months, with total insider holdings of 1.19 million shares. The 10 most recent reported transactions were direct stock awards to directors on April 28, 2026; these grants should not be interpreted as open-market buying.

Risks investors need to monitor

• Nuclear outage exposure: Nuclear production and capacity factor declined as planned refueling outage days more than doubled. Continued outage pressure could limit the earnings benefit from favorable market conditions.
• Calpine integration and accounting effects: Q2 included $84 million of after-tax integration costs and $149 million of after-tax acquired-contract amortization, creating a substantial difference between GAAP and adjusted results.
• Fair-value volatility: Unrealized fair-value adjustments reduced GAAP earnings by $340 million after tax. Similar changes could continue to make reported earnings volatile relative to operating performance.
• Regulatory and execution requirements: The Brazos Valley sale still requires approval, while the Crane restart and New York nuclear license extensions depend on further execution and regulatory progress.

Summary

Constellation’s Q2 2026 results combined higher revenue and adjusted operating earnings with a sharp decline in GAAP profitability. Calpine and favorable market conditions supported the adjusted result, while higher operating costs, fair-value losses, acquired-contract amortization and integration expenses weighed on reported earnings. The main items to monitor are Calpine integration, nuclear outage performance, delivery of the higher full-year outlook and execution of the Crane restart and Brazos Valley divestiture.