Constellation Energy (CEG) 2025 — Grade D: Volatile Margins, $16.4B Calpine Acquisition

Grade: F — Major Red Flags

Framework: Schilit *Financial Shenanigans* + Beneish M-Score + forensic accounting principles

Data: SEC EDGAR 10-K (Filed February 24, 2026) + Yahoo Finance

Auditor: PricewaterhouseCoopers LLP — Unqualified opinion (1 critical audit matter: nuclear decommissioning ARO)

One-line verdict: Constellation Energy's F grade reflects structural cash flow problems and balance sheet complexity that require serious scrutiny, not necessarily fraud. The nation's largest clean energy producer posted $25.5B in revenue and $2.3B in net income, but FCF was negative for two of the last three years, AR has outpaced revenue for two consecutive years, and cash covers only 40% of debt. The January 2026 acquisition of Calpine for $22B — funded with 50 million new shares and $4.5B cash — adds approximately $7.6B in assumed debt and will create "significant goodwill" that has not yet been recorded. PwC flagged the $12.9B nuclear decommissioning ARO as their sole critical audit matter due to the "significant estimates and assumptions" embedded in management's probability-weighted cash flow model. The M-Score could not be computed due to insufficient data.

The Nuclear Giant's Numbers

Constellation Energy is "the nation's largest producer of clean energy and a leading supplier of energy products and services," operating primarily nuclear, wind, solar, natural gas, and hydroelectric assets across five reportable segments: Mid-Atlantic, Midwest, New York, ERCOT, and Other Power Regions. At December 31, 2025, owned generating capacity was 31,676 MWs, with nuclear comprising approximately 22 GWs producing 183 TWhs of zero-emissions electricity.

From the 10-K income statement: "Operating revenues $25,533 [million]" for 2025 vs "$23,568" for 2024. The 8.3% revenue increase was offset by a 28.6% surge in "Purchased power and fuel" costs from $11,419M to $14,681M, compressing gross margin from 25.4% to 18.4%. Operating income dropped from $4,352M to $3,086M.

Net income fell 38% from $3,749M to $2,319M. The decline was driven by higher fuel costs, higher tax expense ($1,187M vs $774M), and the swing in "Net fair value changes related to derivatives" ($645M unfavorable vs prior year favorable), partially offset by higher "Other, net" income of $936M vs $670M.

The Calpine Acquisition: A $22 Billion Bet

On January 7, 2026 — just days after the fiscal year end — Constellation acquired 100% of Calpine for approximately $22 billion. From the 10-K: "The merger consideration consisted of 50 million newly issued shares of our common stock, no par value, and approximately $4.5 billion in cash on hand."

The filing explicitly warns about goodwill risk: "We expect to have a significant goodwill balance following the acquisition of Calpine... We expect that the consideration transferred is greater than the fair value of the net assets acquired, and therefore we anticipate recording goodwill on the opening balance sheet."

The deal also assumed approximately $7.6B in Calpine long-term debt, including "senior unsecured and secured notes, and corporate term loans." Constellation subsequently issued new notes to replace $2.3B of Calpine debt and repaid $2.5B in Calpine corporate term loans.

Why this matters: Constellation had only $420M in goodwill as of December 31, 2025. The Calpine deal will add a massive, as-yet-unquantified goodwill balance. Combined with the assumed $7.6B in debt, total debt will roughly double. For a company whose cash already covers only 40% of existing debt, this dramatically increases balance sheet risk.

Cash Flow: Finally Positive, But History Is Ugly

FY2025 was the first year with positive operating cash flow since the Exelon separation. The 10-K details large working capital swings: collateral received/posted swung from a $1,803M source in 2024 to a ($773M) use in 2025. The accounts receivable facility was amended to reclassify "cash collections of accounts receivable" as operating activities — a presentation change that boosted reported CFFO.

From the cash flow statement, key adjustments to reconcile net income of $2,323M to CFFO of $4,237M include: "Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization" of $2,601M, "Net fair value changes related to derivatives" of $645M, and "Deferred income taxes" of $273M. Working capital was mixed, with accounts receivable using ($363M) and accounts payable providing $326M.

CapEx continues to grow: the 10-K projects "approximately $5.7 billion and $4.7 billion for 2026 and 2027, respectively," including $3.9B in "growth capital expenditures" for Crane restart, nuclear uprates, co-location infrastructure, and license renewals.

The $12.9 Billion Nuclear Decommissioning Obligation

PwC identified the nuclear decommissioning ARO as their sole Critical Audit Matter: "As of December 31, 2025, the nuclear decommissioning ARO was $12.9 billion."

From the auditor's report: "To estimate its decommissioning obligations management uses a probability-weighted, discounted cash flow model which, on a unit-by-unit basis, considers multiple outcome scenarios that include significant estimates and assumptions, and are based on decommissioning cost studies, cost escalation rates, probabilistic cash flow models, and discount rates."

PwC's rationale: "(i) the significant judgment by management when estimating its decommissioning obligations; (ii) a high degree of auditor judgment, subjectivity, and effort in performing procedures and evaluating the reasonableness of management's discounted cash flow model and significant assumptions related to decommissioning cost studies."

Why this matters: A $12.9B liability based on probabilistic models with multi-decade horizons contains enormous estimation uncertainty. Small changes in discount rates, cost escalation assumptions, or decommissioning timelines could shift this liability by billions.

The 18-Point Screening

Revenue Quality

A2: AR growth exceeding revenue growth for two consecutive years is a structural concern. DSO nearly doubled from 28 days in 2023 to 51 days in 2025. The 10-K notes the amendment of the accounts receivable facility, and gross receivables sold were $4,204M in 2025 vs only $280M in 2024 — a 15x increase reflecting the facility restructuring.

Expense Quality

B4: The 7-point gross margin swing reflects the volatility inherent in power markets. "Purchased power and fuel" surged from $11.4B to $14.7B (+28.6%), driven by market dynamics. Gross margin has oscillated wildly: 8.7% (2022) to 13.0% (2023) to 25.4% (2024) to 18.4% (2025). This is structural — energy commodity exposure makes margins inherently unpredictable.

Cash Flow Quality

C2: FCF was negative for FY2023 and FY2024 (($7.7B) and ($5.0B) respectively) before turning positive at $1.3B in FY2025. The company is capital-intensive: PP&E of $41.5B, with $2.0B in construction work in progress and $6.3B in nuclear fuel. Post-Calpine, total debt will approximately double.

C4: Cash of $3.6B covers only 40% of $9.0B in total debt. The 10-K reports credit ratings of BBB+ (S&P) and Baa1 (Moody's), with "a loss of investment grade credit rating would have required a three-notch downgrade." If downgraded below investment grade, the company estimates it "would have been required to provide incremental collateral estimated to be approximately $2.7 billion." Available credit facility capacity was $7.4B as of year-end.

Balance Sheet

D1 will change dramatically post-Calpine. The 10-K states: "Changes in significant assumptions, including discount rates, energy prices, projected operating costs, and cash flows could potentially result in future impairments of goodwill. An impairment would require us to reduce the carrying value... and could have a material adverse impact on our future operating results."

M&A Risk

Beneish M-Score

Key Risks from Item 1A

1. Nuclear regulatory risk. The 10-K warns about "NRC comprehensive safety and environmental review" required for the Crane restart, and that nuclear plants require continuous regulatory compliance. The nuclear PTC is "subject to legislative and regulatory changes."

2. Energy market volatility. Purchased power and fuel costs are the largest expense line ($14.7B, 57% of revenue) and swing dramatically year to year. The company is exposed to "market price risk" including power prices, natural gas prices, and capacity prices.

3. Calpine integration risk. The $22B acquisition is the company's largest ever and creates execution risk. The filing notes "approximately 2,500 employees" are being added and the deal required regulatory divestitures.

4. Environmental liabilities. The $12.9B nuclear decommissioning obligation and $1.4B spent nuclear fuel obligation represent massive long-tail liabilities. The 10-K also notes exposure under CERCLA and various environmental regulations.

Altman Z-Score and F-Score

The Z-Score of 1.65 places Constellation in the grey zone, near the distress boundary of 1.81. This reflects the capital-intensive nature of the utility business with high leverage. Post-Calpine, with approximately $17B+ in combined debt, the Z-Score will likely deteriorate further.

Summary

Grade: F. Three fails drive the grade, but context is critical.

Constellation Energy is not a fraud story — it is a capital-intensive utility undergoing a transformational acquisition. The three fails (AR outpacing revenue, persistent negative FCF, low cash coverage) reflect the structural economics of nuclear power generation: enormous upfront capital requirements, multi-decade asset lives, and commodity-exposed revenue.

The real risks are forward-looking:

Investors should focus on: (a) the post-Calpine goodwill balance when Q1 2026 is reported, (b) whether positive FCF is sustained post-integration, and (c) any changes to nuclear decommissioning cost estimates.

**Disclaimer**: This report is based on Constellation Energy's FY2025 10-K (SEC EDGAR) and public financial data. This is NOT investment advice.

Data: SEC EDGAR 10-K (Filed February 24, 2026) + Yahoo Finance

Auditor: PricewaterhouseCoopers LLP (Unqualified opinion, 1 critical audit matter)