Berkshire Hathaway Inc. (BRK-B) vs NRG Energy, Inc. (NRG): Which Is the Better Buy in 2026?
As of 2026-09-17, BRK-B is fairly valued at $511, with a DCF intrinsic value of $590 and a margin of safety of 13%. NRG is undervalued at $107, with an intrinsic value of $151 and a margin of safety of 29%. Of the two, NRG has the wider margin of safety.
Rewards
- ★Each dollar of retained earnings has created $3.95 of earning power — management is an exceptional capital allocator.
- ★Net debt/EBITDA of -1.8x means the company holds more cash than debt — a net cash position.
- ★Share count has been reduced by 17% over the past 4 years through buybacks, increasing each share's claim on earnings.
- ★PEG ratio of 0.42 suggests the stock is undervalued relative to its growth rate — paying less than 1x for each unit of earnings growth.
Risks
- ⚠FCF yield of 6.6% suggests reasonable valuation assuming continued moderate growth.
- ⚠PEG ratio of 10.06 indicates the stock is expensive relative to its expected growth — the market may be pricing in more growth than analysts project.
- ⚠ROIC has declined by 5.4 percentage points over the past 4 years, which may signal competitive erosion.
- ⚠Gross margin of 18.8% is low, suggesting a competitive or commodity-like market with limited pricing power.
- ⚠Trailing P/E of 27.9x is 34% above the historical average of 20.9x — the stock trades at a premium to its own history.
Key Valuation Metrics
Learn more →Historical Fundamentals
Learn more →Price ÷ Earnings Per Share — how many years of current earnings you're paying for at today's price. Lower P/E may indicate undervaluation. The dashed forward point is the forward P/E — today's price ÷ analyst consensus EPS.
Price ÷ Earnings Per Share — how many years of current earnings you're paying for at today's price. Lower P/E may indicate undervaluation. The dashed forward point is the forward P/E — today's price ÷ analyst consensus EPS.
Price ÷ Earnings Per Share — how many years of current earnings you're paying for at today's price. Lower P/E may indicate undervaluation. The dashed forward point is the forward P/E — today's price ÷ analyst consensus EPS.
$1 Retained Earnings Test
Learn more →> $1 created per $1 retained = Value Creator · < $1 created = Value Destroyer
> $1 created per $1 retained = Value Creator · < $1 created = Value Destroyer
Buffett's "$1 Test": For every $1 of earnings retained, has management created at least $1 of market value?
> $1 created per $1 retained = Value Creator · < $1 created = Value Destroyer
Discounted Cash Flow (DCF) Analysis
Learn more →Reverse DCF — Market-Implied Growth
Learn more →What growth rate is the market pricing in at $511?
The market implies +1.6% Owner Earnings growth, above historical trends.
Standard FCF implies a demanding +0.6%, reflecting heavy growth investment.
What growth rate is the market pricing in at $107?
The market implies +21.0% Owner Earnings growth, above historical trends.
Standard FCF implies a demanding +22.6%, reflecting heavy growth investment.
Economic Moat Score
Learn more →Narrow moat with reinvestment efficiency as the key competitive advantage. Improving revenue predictability would strengthen the moat.
Narrow moat with reinvestment efficiency as the key competitive advantage. Improving margin stability would strengthen the moat.
Forensic Accounting
Learn more →M-Score Trend
Beneish's 8-variable model estimates the probability of earnings manipulation. An M-Score above -1.78 signals elevated risk — companies in this range have historically been 3-5× more likely to be manipulating earnings. Scores between -2.22 and -1.78 fall in a grey zone warranting further investigation.
Ownership Breakdown
Learn more →High insider ownership aligns management incentives with shareholders. Institutional concentration can indicate smart-money conviction but also crowding risk.
Insider Buying Activity
Learn more →Open market purchases · includes direct & indirect ownership · excludes option exercises.
Insider Selling Activity
Learn more →Direct ownership only · excludes indirect, option exercises, planned (10b5-1) sales & derivatives.
🎭 Mr. Market's Mood
Learn more →"Market is optimistic — be cautious and ensure you have a margin of safety"
"Market is pessimistic — investigate whether fears are temporary or structural"
Composite sentiment score based on market signals. Inspired by Buffett’s "Mr. Market" allegory — fear = potential opportunity, greed = potential risk. Must be used alongside fundamental analysis, not in isolation.
⚖️ Buffett Signal
Learn more →The Buffett Signal cross-references market sentiment with DCF valuation. Configure the DCF Analysis above to generate a signal.
The Buffett Signal cross-references market sentiment with DCF valuation. Configure the DCF Analysis above to generate a signal.
Frequently Asked Questions: BRK-B vs NRG
Is Berkshire Hathaway Inc. or NRG Energy, Inc. more undervalued in 2026?▼
Based on our discounted cash flow model, NRG trades at a 28.9% margin of safety (intrinsic value $151 vs. price $107), compared to BRK-B's 13.4% margin of safety (intrinsic $590 vs. $511).
Which stock has a wider economic moat, Berkshire Hathaway Inc. or NRG Energy, Inc.?▼
NRG scores 42/100 (Narrow moat), while BRK-B scores 40/100 (Narrow moat). The moat score measures competitive advantage durability across ROIC consistency, margin stability, revenue predictability, and reinvestment efficiency.
Is NRG Energy, Inc. in financial distress?▼
NRG's Altman Z-Score of 2.2 places it in the Grey zone, signaling elevated bankruptcy risk. BRK-B scores 2.5 (Grey zone). The Altman Z-Score is a five-factor model that predicts insolvency within two years; scores below 1.81 indicate significant distress.
Which company has better free cash flow, Berkshire Hathaway Inc. or NRG Energy, Inc.?▼
Berkshire Hathaway Inc. (BRK-B) generates a 6.6% free cash flow yield, compared to NRG Energy, Inc.'s 3.4%. A higher FCF yield means the business converts more of its market value into cash that can be returned to shareholders or reinvested.
Which stock has higher return on invested capital, Berkshire Hathaway Inc. or NRG Energy, Inc.?▼
NRG earns 11.8% ROIC versus BRK-B's 11.3%. A higher ROIC means the company generates more profit per dollar of capital employed, a hallmark of durable competitive advantage in Buffett-style analysis.