ISA ENERGIA BRASIL (ISAE3) fair value: what the stock is really worth
As of Sep 23, 2026: fair value of ISA ENERGIA BRASIL BRL 56.59, price BRL 32.90, upside +72.0%, quality 47 out of 100. Calculated from audited financials with 26 valuation models and 37 quality factors, updated daily.
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Price vs Fair Value
White line = price, green steps = our fair value per fiscal year, dashed = 300-day average. As of Sep 24, 2026.
How to read this chart
60‑month range R$21.94 – R$36.05 · fair‑value band R$42.44 – R$70.74 · the R$32.90 price screens below the R$56.59 fair value. Green steps = our fair value per fiscal year (point-in-time, no hindsight). Dashed = 300-day average. As of Sep 24, 2026.
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ISA Energía Brasil S.A. engages in the electric power transmission business in Brazil. As of December 31, 2025, it had a total installed transformation capacity of 84,910 MVA together with transmission lines of 23,000 kilometers. It operates in the states of Bahia, Espírito Santo, Minas Gerais, Rio de Janeiro, and São Paulo. ISA Energía Brasil S.A.
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ISA Energía Brasil S.A. engages in the electric power transmission business in Brazil. As of December 31, 2025, it had a total installed transformation capacity of 84,910 MVA together with transmission lines of 23,000 kilometers. It operates in the states of Bahia, Espírito Santo, Minas Gerais, Rio de Janeiro, and São Paulo. ISA Energía Brasil S.A. was incorporated in 1999 and is headquartered in São Paulo, Brazil.
Stock analysis
ISA ENERGIA BRASIL (ISAE3) currently trades at R$32.90, while our model-based Fair Value estimate is R$56.59, implying the stock looks roughly 41.9% undervalued today.
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Valuation
Bull case: the DCF Models group reads highest at a median of R$118.83 per share, and 15 of the 17 models we run sit above the R$32.90 price.
Bear case: the Asset-Based group reads lowest at R$21.51, and 2 of the 17 models stay below the price. Evidence for this calculation is high.
Scenario range: R$42.44 (bear) to R$70.74 (bull), the price of R$32.90 sits below it. Bear and bull are the same models on cautious and optimistic assumptions, a range, not a price target.
Quality & growth
The Quality Score stands at 47/100 (below-average quality), in the Utilities sector.
Expensive Growth: The company is growing, but growth may require heavy reinvestment or weak cash conversion.
ISA ENERGIA BRASIL reported revenue of R$9.4B in FY2025 versus R$5.5B in FY2021, a compound +14.2%/yr. Reported net income was R$2.4B in FY2025, compounding −5.1%/yr from FY2021.
Key figures
Market cap R$21.7B (≈ $4.2B) · P/E ratio 9.5 · P/S ratio 2.47 · EPS (TTM) R$3.56 · Dividend yield 5.6% · Net margin 26.0% · Return on equity 11.3% · Return on assets (EBIT) 11.2%.
Competitive moat
Our AI-assisted moat analysis scores the competitive advantage at 47 out of 100 (low confidence).
What moves the price
The share trades about 9% below its 52-week high and 14% above its 52-week low, currently below its 200-day average.
For context, the median of 10 Utilities peers we cover trades at −48% fair-value upside, at 72%, ISAE3 screens cheaper than that median.
Fair Value models
Bear R$42.44Fair Value R$56.59Bull R$70.74
Model ⓘEach model values the company its own way (discounted cash flow, earnings, assets, dividends). The fair value above is their evidence-weighted blend, not the output of a single model. Based on fiscal year 2025 figures (about 9 months old). Earnings retained since then (R$1.25 per share) are deliberately not added.Bear ⓘBear = the cautious scenario: the same model computed with conservative anchors (lower growth, margins and valuation multiples). Together with Bull it frames a plausible valuation range, not a price target.BaseBull ⓘBull = the optimistic scenario: the same model computed with favourable anchors (higher growth, margins and valuation multiples). Together with Bear it frames a plausible valuation range, not a price target.Evidence ⓘEvidence = how well-backed THIS model's estimate is for this stock (0–100): how complete and reliable its input data are, and how well the model fits the company. The final Fair Value is an evidence-weighted blend, so better-evidenced models count more. Green ≥70, amber 50–69, grey below 50.
Growth Quality ⓘGrowth is valuable only when reinvestment earns attractive returns (Aswath Damodaran): sustainable growth depends on return on capital, reinvestment and efficiency. Basis: total company revenue over the periods shown on the cards (3Y/5Y/all years), not per share, so a merger can show up as a growth jump; per-share earnings growth is in the value-creation card.62/100
The company is growing, but growth may require heavy reinvestment or weak cash conversion.
Revenue growth 1 year
+18.1%
Revenue growth 3 years ⓘMeasures the company's TOTAL revenue from reported annual statements: compound average growth per year (CAGR) from the fiscal year 3, 5 or N years back to the most recent comparable fiscal year. Not per share: buybacks do not change this number, and a merger can appear as a growth jump. Per-share growth (which does include buybacks) is in the value-creation card.
+20.0%
’21
’22
’23
’24
’25
What shareholders gained per year (last 5 years), in BRL ⓘWhat the business itself delivers per year: earnings growth per share plus the dividend yield. This is what you get IF the market keeps valuing the stock the same way: it contains no assumption about the market changing its mind. Computed per share, so buybacks count and a merger does not pass as growth. For a company that pays no dividend it is pure earnings growth per share. Period: earnings growth per share as CAGR over the last 5 reported fiscal years (annual statements), plus the current dividend yield. The start value is the median of the three years around the start, so a single crisis year (a pandemic or a write-down) does not distort the rate. Measured in BRL: this currency has depreciated against the euro and dollar over the long run, so part of the nominal rate is currency erosion that never reaches a EUR/USD investor.
+1.5%
Earnings growth per share plus dividend.
Earnings per share, growth per year−4.1%
Dividend (yield on the price)5.6%
Profit margin 2021 to 2025 ⓘOperating margin then vs now, from reported annual statements. A falling margin after a boom year is the classic peak-earnings signal: the growth rate then leans on an inflated base.71% → 44%
Price, fair value, quality and upside side by side.
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Peer GroupⓘHow this stock ranks against its industry: the green marker is this stock, the band is the typical 25–75% peer range, and the tick is the median.Utilities - Independent Power Producers · 75 stocks
Beats the industry median on 9/14 measures
Overall it ranks above its industry peers.
Valuation
Quality Score47 · Below median
Fair Value upside+72% · Top 25%
Profitability
Return on equity (TTM)11% · Top 25%
Return on assets5% · Top 25%
Net margin (TTM)25% · Top 25%
Operating margin (TTM)44% · Top 25%
Growth and dividend
Revenue growth4% · Above median
Dividend yield (TTM)5.6% · Above median
Balance sheet
Debt / equity0.73× · Above median
Valuation Multiplesvs Utilities - Independent Power Producers median · lower = cheaper
For bloggers, editors and developers: paste this into your site or blog (a “Custom HTML” block in WordPress), it shows the current fair value and links back here. Free, plain HTML, and welcome. Full data streams (CSV/JSON) at /developers.
Cite: Fair Value Calculator (2026). "ISA ENERGIA BRASIL Fair Value". https://www.fairvalue-calculator.com/stock/ISAE3
Frequently asked questions
Is ISA ENERGIA BRASIL (ISAE3) overvalued or undervalued?
As of Sep 24, 2026, our model estimates a fair value of R$56.59 versus a price of R$32.90, about +72% upside (undervalued).
What is the fair value of ISAE3?
Our model-based fair value for ISA ENERGIA BRASIL is R$56.59 (as of Sep 24, 2026), built from audited fundamentals. The current price: R$32.90.
What is the quality score of ISAE3?
ISA ENERGIA BRASIL has a Quality Score of 47/100. It measures business quality (profitability, growth, cash flow, balance-sheet strength, investment discipline, share issuance). Market factors such as price momentum and volatility do not enter the number; they are shown separately in the detail view.
What is the price target for ISA ENERGIA BRASIL (ISAE3)?
Our model-based price target is the fair value of R$56.59 (as of Sep 24, 2026) from 17 valuation models. Cautious scenario R$42.44, optimistic scenario R$70.74. It is a calculation from audited fundamentals, not an analyst target.
What is the ISA ENERGIA BRASIL stock forecast for 2026?
Our models put fair value at R$56.59, about +72% upside versus a price of R$32.90 (undervalued). Cautious scenario R$42.44, optimistic scenario R$70.74. The calculation is refreshed regularly with new filings.
What is the revenue of ISA ENERGIA BRASIL (ISAE3)?
ISA ENERGIA BRASIL reported trailing-twelve-month revenue of about R$9.5B (latest available figure, as of Sep 24, 2026).
Does ISA ENERGIA BRASIL pay a dividend?
ISA ENERGIA BRASIL currently shows a dividend yield of about 5.63% relative to its recent price (as of Sep 24, 2026).
What is the intrinsic value of ISA ENERGIA BRASIL (ISAE3)?
Intrinsic value and fair value mean the same thing: what the business is worth on its numbers, independent of the share price. For ISA ENERGIA BRASIL it is R$56.59 per share (as of Sep 24, 2026), against a price of R$32.90. It is the blended result of 17 valuation models (cash flow, earnings, asset, dividend).
Is ISA ENERGIA BRASIL stock overvalued or undervalued in 2026?
As of Sep 24, 2026, ISAE3 trades below its calculated fair value: price R$32.90, fair value R$56.59, a gap of about +72% (undervalued). The calculation is refreshed with each new quarterly report, so the verdict can change during the year.
Is fair value the same as the market price of ISAE3?
No. The price is what the market pays today (R$32.90); the fair value is what the company's own numbers justify (R$56.59). For ISA ENERGIA BRASIL the two are R$23.69 per share apart. That gap is exactly why we show both numbers side by side.
How much is ISA ENERGIA BRASIL worth?
The market values ISA ENERGIA BRASIL at about R$21.7B (market capitalisation, as of Sep 24, 2026). Per share that is R$32.90; our models calculate a fair value of R$56.59 per share.
What do the bullish and bearish scenarios say about ISAE3?
Our models span a range for ISA ENERGIA BRASIL: cautious scenario R$42.44, base R$56.59, optimistic R$70.74 per share (as of Sep 24, 2026, price R$32.90). The range comes from different growth and margin assumptions, not from analyst opinions.
What is the P/E ratio of ISAE3?
ISA ENERGIA BRASIL trades at a price-to-earnings ratio of 9.5 (as of Sep 24, 2026). A P/E on its own says little: it compares the price with ONE year of profit, while our fair value of R$56.59 is built from several models across several years. Other multiples: PEG 1.8, P/B 1.0, P/S 2.3, EV/EBITDA 9.8.
What is the PEG ratio of ISAE3?
The PEG ratio of ISA ENERGIA BRASIL is 1.75 (P/E divided by earnings growth, as of Sep 24, 2026). That is above 1, so the growth is already paid for in the price.
How solid is the balance sheet of ISA ENERGIA BRASIL (ISAE3)?
Balance-sheet figures for ISA ENERGIA BRASIL (as of Sep 24, 2026): return on equity 11.3%, debt of 0.73 per unit of equity. They feed the Quality Score of 47/100, which measures business quality independently of the share price.
How far is ISAE3 from its 52-week high?
ISA ENERGIA BRASIL trades at R$32.90, about 9% below its 52-week high of R$36.05 and 14% above the low of R$28.78 (as of Sep 23, 2026). Distance from the high says nothing about value: that is what the fair value of R$56.59 is for.
Which stocks are comparable to ISA ENERGIA BRASIL?
From the same area (Utilities) we also value Constellation Energy Corporation, Vistra Corp, Adani Power Limited, CGN Power Co, among others. Each of them has its own fair-value calculation on this site using the same models, so the comparison is like for like.
Is ISA ENERGIA BRASIL stock attractive at the current price?
The data as of Sep 24, 2026: price R$32.90, calculated fair value R$56.59 (+72%), Quality Score 47/100, from 17 models. Whether that fits your horizon and risk tolerance is your call. We provide the calculation, not investment advice.
How is the fair value of ISAE3 calculated?
We run ISA ENERGIA BRASIL through 17 models from four families: discounted cash flow, earnings models, asset and balance-sheet models, and dividend models. Every model gets the same audited fundamentals; the result is the weighted average of R$56.59, with the spread shown as a cautious and an optimistic scenario.
Is it still worth investing in stocks now?
The global stock market currently sits 14.1 % above its aggregate fair value. ISA ENERGIA BRASIL currently trades 72 % below its own fair value, and the market average says nothing about that. An expensive market is no reason to stay out and no reason to buy everything at once: keep a broad savings plan running, buy single stocks only with money you can do without, and hold part of your money liquid while the market is high. The full picture including sectors is on is it worth investing now.
What is the share price of ISA ENERGIA BRASIL (ISAE3)?
The closing price on Sep 23, 2026 was R$32.90. Our model-based fair value is R$56.59, about +72% upside (undervalued). We carry closing prices from our data provider, not a live tick.
What should I pay attention to with ISA ENERGIA BRASIL right now?
The price is below even our cautious bear case (R$42.44). The market is more pessimistic than our downside scenario. Solid quality (47/100) at a price below fair value, the discount is the argument here, not the business quality.
Key figures of ISA ENERGIA BRASIL
How large is the market capitalisation of ISA ENERGIA BRASIL (ISAE3)?
The market capitalisation of ISA ENERGIA BRASIL is R$21.7B (≈ $4.2B). The stock-market value of the whole company: share price times number of shares. It is what the market asks for the entire business today.
What is the P/S ratio of ISA ENERGIA BRASIL (ISAE3)?
The price-to-sales ratio of ISA ENERGIA BRASIL is 2.47 (P/E × margin). Price to sales: market value relative to yearly revenue. Useful when profit is thin or distorted.
What are the earnings per share of ISA ENERGIA BRASIL (ISAE3)?
Earnings per share at ISA ENERGIA BRASIL are R$3.56 (price ÷ EPS = P/E 9.5). Earnings per share over the last twelve months: total profit spread across every single share.
What is the dividend yield of ISA ENERGIA BRASIL (ISAE3)?
The dividend yield of ISA ENERGIA BRASIL is 5.6% (payout 52.0%). Yearly dividend relative to the share price. 3% pays 3 per 100 invested. Below: how much of profit is used for it.
What is the net margin of ISA ENERGIA BRASIL (ISAE3)?
The net margin of ISA ENERGIA BRASIL is 26.0% (fiscal year 2025). How much of every unit of revenue ends up as profit. 10% means 10 cents of profit per dollar of sales.
What is the return on equity of ISA ENERGIA BRASIL (ISAE3)?
The return on equity (ROE) of ISA ENERGIA BRASIL is 11.3% (last twelve months). Profit relative to shareholders' equity, how efficiently the company works with its owners' money.
What is the EBIT return on assets of ISA ENERGIA BRASIL (ISAE3)?
On an EBIT basis the return on assets of ISA ENERGIA BRASIL is 11.2% (avg 5y). Operating profit (EBIT) relative to everything the company owns, as a multi-year average. It describes the business model rather than one good or bad year.
What is the operating margin of ISA ENERGIA BRASIL (ISAE3)?
The operating margin of ISA ENERGIA BRASIL is 43.9% (last twelve months). Profit from the core business (before interest and taxes) relative to revenue.
How fast is revenue growing at ISA ENERGIA BRASIL (ISAE3)?
Revenue at ISA ENERGIA BRASIL is growing +4.1% versus a year earlier (3y avg +20.0%). How much revenue grew versus a year earlier (YoY). The 3-year average next to it puts the single year in context.
How fast are earnings growing at ISA ENERGIA BRASIL (ISAE3)?
Earnings per share at ISA ENERGIA BRASIL are growing −14.6% versus a year earlier. How much earnings per share grew versus a year earlier.
How much free cash flow does ISA ENERGIA BRASIL (ISAE3) generate?
The free cash flow of ISA ENERGIA BRASIL is −R$1.3B (fiscal year 2025). The cash truly left after running and investing in the business, this is what pays dividends and buybacks.
How much net debt does ISA ENERGIA BRASIL (ISAE3) carry?
The net debt of ISA ENERGIA BRASIL is R$14.6B (fiscal year 2025). Debt minus cash on hand. The note shows how many years of free cash flow could in theory pay it off.
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