TAC vs AES vs NRG vs VST

For growth investors, NRG Energy, Inc.

(NRG) is the stronger pick with 9. 2% revenue growth year-over-year, versus -15. 5% for TransAlta Corporation (TAC). The AES Corporation (AES) offers the better valuation at 11. 3x trailing P/E (6. 2x forward), making it the more compelling value choice. Analysts rate TransAlta Corporation (TAC) a "Buy" — based on 9 analyst ratings — the highest consensus in this comparison. The "better buy" depends entirely on your goals: growth investors should weight revenue trajectory, value investors should weight P/E and PEG, and income investors should weight dividend yield and streak.

On trailing P/E, The AES Corporation (AES) is the cheapest at 11.

3x versus Vistra Corp. at 69. 7x. On forward P/E, The AES Corporation is actually cheaper at 6. 2x. The PEG ratio (P/E divided by earnings growth rate) is the most growth-adjusted single valuation metric: The AES Corporation wins at 0. 08x versus Vistra Corp. 's 1. 49x — a PEG below 1. 0 traditionally signals the market is underpricing earnings growth.

Over the past 5 years, Vistra Corp.

(VST) delivered a total return of +884. 7%, compared to -31. 7% for The AES Corporation (AES). Over 10 years, the gap is even starker: VST returned +901. 5% versus AES's +82. 0%. Past returns do not guarantee future results, and the stock with the higher historical return may already have its best growth priced in.

By beta (market sensitivity over 5 years), The AES Corporation (AES) is the lower-risk stock at 0.

99β versus NRG Energy, Inc. 's 1. 80β — meaning NRG is approximately 82% more volatile than AES relative to the S&P 500. On balance sheet safety, The AES Corporation (AES) carries a lower debt/equity ratio of 3% versus 10% for NRG Energy, Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), NRG Energy, Inc.

(NRG) is pulling ahead at 9. 2% versus -15. 5% for TransAlta Corporation (TAC). On earnings-per-share growth, the picture is similar: NRG Energy, Inc. grew EPS -19. 6% year-over-year, compared to -206. 7% for TransAlta Corporation. Over a 3-year CAGR, NRG leads at -0. 9% annualised revenue growth. Higher growth typically commands a higher valuation multiple — check whether the premium P/E or P/S is justified by the growth rate using the PEG ratio.

The AES Corporation (AES) is the more profitable company, earning 7.

8% net margin versus -5. 7% for TransAlta Corporation — meaning it keeps 7. 8% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: AES leads at 16. 1% versus -9. 2% for TAC. At the gross margin level — before operating expenses — TAC leads at 32. 6%, reflecting greater pricing power or product mix advantage. Stronger margins indicate durable pricing power, lower cost of revenue, or higher mix of software/services. They are one of the clearest signs of business quality.

The PEG ratio (forward P/E divided by expected earnings growth rate) is the most precise measure of undervaluation relative to growth potential.

By this metric, The AES Corporation (AES) is the more undervalued stock at a PEG of 0. 08x versus Vistra Corp. 's 1. 49x. A PEG below 1. 0 is traditionally considered the threshold for growth-adjusted undervaluation. On forward earnings alone, The AES Corporation (AES) trades at 6. 2x forward P/E versus 42. 3x for TransAlta Corporation — 36. 1x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for VST: 47. 7% to $227. 60.

All stocks in this comparison pay dividends.

The AES Corporation (AES) offers the highest yield at 4. 9%, versus 0. 6% for Vistra Corp. (VST).

For long-horizon retirement investors, Vistra Corp.

(VST) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (0. 6% yield, +901. 5% 10Y return). NRG Energy, Inc. (NRG) carries a higher beta of 1. 80 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (VST: +901. 5%, NRG: +847. 5%), confirming both are viable long-term holds — but the lower-volatility option typically results in less emotional selling during corrections. Retirement portfolios generally favour predictability over maximum returns. Consult a financial advisor before making allocation decisions.

Both stocks operate in the null sector, making this a peer-level intra-sector comparison — the same macro tailwinds and headwinds will affect both.

In terms of investment character: TAC is a small-cap quality compounder stock; AES is a mid-cap deep-value stock; NRG is a mid-cap quality compounder stock; VST is a mid-cap quality compounder stock. These fundamental differences mean investors should not choose between them on a single metric — the "better stock" depends entirely on which of these characteristics aligns with your investment strategy.