Why did GAAP net income fall so sharply in Q3 2025 even though Adjusted EBITDA increased?

GAAP net income is heavily affected by unrealized mark-to-market swings on derivatives. The unrealized gains recognized in Q3 2024 were much larger than those in Q3 2025, a $1,671 million swing that drove most of the $1,185 million decline. Adjusted EBITDA strips out these unrealized hedging items, and on that basis results improved 10% on stronger realized prices and nuclear PTC revenue.

What do the revised 2025 and new 2026 guidance ranges imply for investors?

The 2025 Adjusted EBITDA range narrowed to $5.7-$5.9 billion, and the Adjusted FCFbG midpoint rose. The 2026 Adjusted EBITDA range of $6.8-$7.6 billion represents a substantial step up from 2025, and the 2026 FCFbG range of $3.925-$4.725 billion is also higher. Guidance excludes any potential benefit from the nuclear production tax credit, so PTC recognition could add upside.

How much of Vistra's future generation is already hedged, and why does it matter?

As of October 31, 2025, about 98% of expected 2025 generation, 96% of 2026, and 70% of 2027 was hedged. High hedge coverage reduces exposure to near-term power price volatility and gives more confidence in the guidance ranges, though it also limits upside if prices rise.

Is the $7.4-$7.8 billion 2027 figure a guidance number?

No. Management describes it as a midpoint opportunity, not guidance. It is an internal estimate based on October 31, 2025 market curves, and actual results could differ materially because of power price movements and hedging strategy. No quantitative reconciliation to GAAP net income was provided for this figure.

How is Vistra using its capital, and what did it do with the new capacity?

Vistra authorized an additional $1.0 billion of share repurchases, with about $2.2 billion remaining and completion expected by year-end 2027. It closed the acquisition of seven gas plants (about 2,600 MW), announced 860 MW of new gas capacity in West Texas, and signed a 20-year PPA for 1,200 MW from Comanche Peak to support continued nuclear operations through the middle of the century.

VST 8-K: Earnings & Results

01—Abstract

Summary

Summary of the 8-K filed November 6, 2025. Cited figures are marked; the original filing is the authoritative source.

Vistra Corp. (VST) reported third quarter 2025 results on November 6, 2025, with GAAP net income of $652 million^a, down $1,185 million year over year.

The decline was driven mainly by a $1,671 million^b drop in unrealized mark-to-market gains on derivatives and the Martin Lake Unit 1 outage, partly offset by recognition of nuclear production tax credit (PTC) revenue and higher capacity prices. Ongoing Operations Adjusted EBITDA rose 10% to $1,581 million from $1,438 million, led by higher realized energy and capacity prices and the PTC recognition. The non-GAAP metric is the figure management emphasizes, and it is the basis for the guidance changes.

Guidance moved in both directions. The 2025 Ongoing Operations Adjusted EBITDA range was narrowed to $5.7^c-$5.9 billion, and the Adjusted FCF before Growth range was narrowed to $3.3-$3.5 billion with a higher midpoint. Initial 2026 guidance calls for Adjusted EBITDA of $6.8-$7.6 billion and Adjusted FCFbG of $3.925-$4.725 billion.

Management also gave a 2027 Adjusted EBITDA midpoint opportunity of $7.4^d-$7.8 billion, which it explicitly says is not guidance and is based on October 31, 2025 market curves. Hedging is high: about 98% of 2025, 96% of 2026, and 70% of 2027 expected generation volumes were hedged as of October 31, 2025. Capital allocation and portfolio moves were active.

The board authorized an additional $1.0 billion of buybacks, and about $2.2 billion of authorization remained, with completion expected by year-end 2027. Vistra also closed the acquisition of seven natural gas plants (about 2,600 MW) from Lotus Infrastructure Partners, announced two new gas units totaling 860 MW in West Texas, and signed a 20-year PPA for 1,200 MW from Comanche Peak. Investors should note that GAAP results are volatile because of mark-to-market accounting, so the Adjusted EBITDA and FCFbG guidance is the better guide to underlying performance.

02—Key points

Key Highlights

Q3 2025 GAAP net income of $652 million, down from $1,837 million in Q3 2024, mainly due to lower unrealized derivative gains (-$1,671 million) and the Martin Lake Unit 1 outage.
Q3 2025 Ongoing Operations Adjusted EBITDA of $1,581 million, up 10% year over year on higher realized energy and capacity prices and nuclear PTC revenue.
2025 Ongoing Operations Adjusted EBITDA guidance narrowed to $5.7-$5.9 billion; Adjusted FCFbG guidance narrowed to $3.3-$3.5 billion with a higher midpoint.
Initial 2026 guidance: Adjusted EBITDA of $6.8-$7.6 billion and Adjusted FCFbG of $3.925-$4.725 billion.
Additional $1.0 billion share repurchase authorization; roughly 339 million shares outstanding, about 30% below the November 2021 level.
Closed acquisition of seven natural gas plants (~2,600 MW) from Lotus Infrastructure Partners; announced 860 MW of new West Texas gas units and a 20-year, 1,200 MW Comanche Peak PPA.
Hedging coverage of about 98% for 2025, 96% for 2026, and 70% for 2027 supports the outlook; 2027 Adjusted EBITDA midpoint opportunity of $7.4-$7.8 billion is indicative only and not formal guidance.

03—Questions

Frequently Asked Questions

Why did GAAP net income fall so sharply in Q3 2025 even though Adjusted EBITDA increased?
GAAP net income is heavily affected by unrealized mark-to-market swings on derivatives. The unrealized gains recognized in Q3 2024 were much larger than those in Q3 2025, a $1,671 million swing that drove most of the $1,185 million decline. Adjusted EBITDA strips out these unrealized hedging items, and on that basis results improved 10% on stronger realized prices and nuclear PTC revenue.
What do the revised 2025 and new 2026 guidance ranges imply for investors?
The 2025 Adjusted EBITDA range narrowed to $5.7-$5.9 billion, and the Adjusted FCFbG midpoint rose. The 2026 Adjusted EBITDA range of $6.8-$7.6 billion represents a substantial step up from 2025, and the 2026 FCFbG range of $3.925-$4.725 billion is also higher. Guidance excludes any potential benefit from the nuclear production tax credit, so PTC recognition could add upside.
How much of Vistra's future generation is already hedged, and why does it matter?
As of October 31, 2025, about 98% of expected 2025 generation, 96% of 2026, and 70% of 2027 was hedged. High hedge coverage reduces exposure to near-term power price volatility and gives more confidence in the guidance ranges, though it also limits upside if prices rise.
Is the $7.4-$7.8 billion 2027 figure a guidance number?
No. Management describes it as a midpoint opportunity, not guidance. It is an internal estimate based on October 31, 2025 market curves, and actual results could differ materially because of power price movements and hedging strategy. No quantitative reconciliation to GAAP net income was provided for this figure.
How is Vistra using its capital, and what did it do with the new capacity?
Vistra authorized an additional $1.0 billion of share repurchases, with about $2.2 billion remaining and completion expected by year-end 2027. It closed the acquisition of seven gas plants (about 2,600 MW), announced 860 MW of new gas capacity in West Texas, and signed a 20-year PPA for 1,200 MW from Comanche Peak to support continued nuclear operations through the middle of the century.

04—Continue

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