Duke Energy Corporation (DUK) FY2025 Earnings Quality Report

Grade: F — Major Red Flags

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

Data: SEC EDGAR 10-K (Filed 2026-02-26) + Yahoo Finance

Auditor: Deloitte & Touche LLP — Clean opinion (1 critical audit matter: recovery of regulatory assets)

One-line verdict: Duke Energy is the largest electric utility in the United States by customer count, serving approximately 8.4 million electric and 1.6 million gas customers across six states. The F grade reflects just two fails (negative FCF, cash vs debt) plus three watch items — the mildest screening result in this batch. Revenue grew 6.2% to $32.2B, net income rose 9.8% to $5.0B, and CFFO was flat at $12.3B. Duke's $90.9B in total debt is the largest absolute debt load here, but the 2.48x CFFO/NI ratio and zero impairments point to high-quality earnings. The $19.0B in goodwill and intangibles (37% of equity) warrants monitoring, largely from the 2012 Progress Energy merger. Duke committed $14.0B in capital investments in FY2025, up from $12.3B in FY2024, reflecting massive grid modernization and clean energy transition spending.

Business: Largest U.S. Electric Utility

Duke Energy operates primarily through two segments: Electric Utilities and Infrastructure (EU&I) and Gas Utilities and Infrastructure (GU&I). The subsidiary registrants include Duke Energy Carolinas, Duke Energy Progress, Duke Energy Florida, Duke Energy Ohio, Duke Energy Indiana, and Piedmont Natural Gas.

Segment Performance (from 10-K)

Piedmont Natural Gas (from 10-K)

Piedmont, Duke's gas distribution subsidiary, shows a clean income statement:

Piedmont's revenue surged 30% ($507M) while cost of natural gas nearly doubled (+$361M) — reflecting higher gas prices that are passed through to customers.

Revenue and Income

Gross margin expanding from 50.1% to 51.2% while revenue grows 6.2% is a positive signal — rate increases are outpacing cost growth. Net margin improvement to 15.4% reflects operating leverage on a massive asset base.

Cash Flow: Scale of Capital Investment

CFFO of $12.3B — flat YoY — is the largest operating cash flow in this batch by far. The CFFO/NI ratio of 2.48 confirms strong earnings quality. FCF of -$1.7B is modest relative to the scale of operations, and Duke's $14.0B in capital investments in FY2025 is among the largest in the U.S. utility sector.

Capital Investments by Segment (from 10-K)

Electric CapEx increased $1.9B (+17.4%) while gas CapEx decreased $199M, suggesting a strategic shift toward electric grid investment.

The 18-Point Screening

Revenue Quality

Revenue quality is pristine. DSO improved by 8 days (56 to 48), AR declined 8.2% while revenue grew — the strongest revenue quality performance in this batch.

Expense Quality

Cash Flow Quality

C4: $245M cash against $90.9B debt produces a coverage ratio that rounds to 0%. However, the $90.9B includes long-term mortgage bonds, securitization bonds, and credit facility borrowings spread across multiple regulated subsidiaries, each with independent access to capital markets and regulatory-approved cost recovery.

Balance Sheet

D1: The $19.0B in goodwill and intangibles is the largest absolute amount in this batch. From the 10-K: "no goodwill impairment charges were recorded in 2025." The goodwill is primarily from the 2012 Progress Energy merger and the 2016 Piedmont Natural Gas acquisition. Annual impairment testing using discounted cash flows and market multiples showed fair value "substantially exceeded" carrying value for each reporting unit.

Acquisition & Manipulation

Deloitte Critical Audit Matter: Regulatory Asset Recovery

Deloitte's CAM focused on recovery of regulatory assets. Procedures included: "testing the effectiveness of management's controls over the evaluation of the likelihood of recovery in future rates and the monitoring and evaluation of regulatory developments." Deloitte also: "read relevant regulatory orders issued by the Commissions and other publicly available information to assess the likelihood of recovery in future rates."

Duke operates across multiple state regulatory jurisdictions (NC, SC, FL, OH, IN, KY), each with different regulatory frameworks, authorized returns, and cost recovery timelines.

Key Risks

1. Nuclear fleet. Duke operates nuclear stations in North Carolina and South Carolina. From the 10-K: "Duke Energy anticipates that its nuclear stations will continue to qualify for significant tax incentives in the form of nuclear production tax credits as allowed under the IRA and OBBBA." If nuclear production tax credits are eliminated or reduced, it would impact both costs and customer rates.

2. EPA regulations. From the 10-K: "new EPA rules issued in April 2024 impose stringent GHG emission reduction standards, revised air toxic limits, and wastewater discharge limitations that may impact the achievement of carbon-reductions, and operational timeline and costs associated with certain new and existing generation."

3. Scale of capital plan. $14.0B in annual capital investment requires continuous access to capital markets. Any disruption in credit conditions or downgrade in credit ratings could materially increase funding costs.

4. Coal combustion residual remediation. From the 10-K, Duke entered a CCR settlement agreement with the North Carolina Attorney General's Office and the Sierra Club related to coal ash remediation.

Altman Z-Score and F-Score

Summary

Grade: F — entirely structural, cleanest utility in the batch.

Duke Energy has the mildest screening profile among these 10 utilities: just 2 fails and 3 watch items, with zero genuine accounting anomalies. Both fails are the purest structural utility features — negative FCF from $14.0B CapEx and $245M cash against $90.9B debt. Revenue quality is the best in the batch (DSO improving 8 days, AR declining 8.2% while revenue grows). The $19.0B goodwill is substantial but stable and well-tested. CFFO/NI of 2.48 and net margin of 15.4% demonstrate high-quality earnings at scale. The F-Score fraud probability of 0.20% confirms clean financials.

**Disclaimer**: This report is based on Duke Energy's FY2025 10-K (SEC EDGAR, filed 2026-02-26) and public financial data. This is NOT investment advice.

Data: SEC EDGAR 10-K (Filed 2026-02-26) + Yahoo Finance

Auditor: Deloitte & Touche LLP (Unqualified opinion, 1 critical audit matter)