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Summary: Healthier state power distributors should be good news for a company that sells them electricity. For PTC India, they have also squeezed an income stream it long enjoyed. IEX, which runs the marketplace, faces a different threat, and it comes from the regulator.
A state electricity distributor suddenly needs more power. It can ask PTC India to arrange it through a bilateral contract or an exchange. Or buyers and sellers can meet on Indian Energy Exchange (IEX), where bids are matched and the price is discovered.
The electricity ultimately reaches the same buyer. But the two companies helping it get there make money very differently.
PTC earns a spread on electricity traded. IEX earns a toll on the marketplace. That distinction explains almost everything, from their margins and capital efficiency to how they benefit from India's changing power market.
A trader versus a marketplace
PTC connects generators with distribution companies and other consumers across contracts of different durations. Its earnings therefore depend on both the amount of electricity traded and the margin it earns on each unit.
IEX normally does not buy and resell electricity. It provides the platform on which participants trade and collects transaction fees.
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|
PTC India | IEX |
| Role | Power trader/intermediary | Power exchange |
| Basic earnings engine | Volume × trading margin | Volume × transaction fee |
| Simple analogy | Wholesaler in a mandi | Owner of the mandi |
| Working-capital need | Meaningful | Low |
| Operating leverage | Moderate | High |
| Main vulnerability | Trading margins and payment-related income | Regulation and market coupling |
The difference is visible in their numbers.
Five years reveal the real difference
| FY21-FY26 | PTC India | IEX |
|---|---|---|
| Electricity volume: FY21 | 80.0 BU | 74.0 BU |
| Electricity volume: FY26 | 92.8 BU | 141.1 BU |
| 5-year volume CAGR | 3.00% | 13.80% |
| 5-year PAT CAGR* | -0.70% | 17.30% |
| 5-year average EBITDA margin** | 2.60% | 84.70% |
| 5-year average ROCE*** | 13.60% | 47.10% |
| Important mix change | Exchange volumes: 43.1% → 56.3% | RTM volumes: 12.8% → 38.9% |
| Change in unit economics | Trading margin: 4.19 → 3.35 paise/unit, down 20.0% | Higher share of flexible, real-time trading |
| *PTC reports electricity purchased and sold as revenue, while IEX records mainly fees, so margins are not directly comparable. The enormous gap nevertheless demonstrates how different the models are. **Five-year average using reported group-level ROCE. PTC's figure is affected by its finance subsidiary and FY25 asset-sale gain. |
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PTC's volumes have risen from roughly 80 BU in FY21 to 93 BU in FY26, while IEX's electricity volumes have nearly doubled. More importantly, IEX converted that expansion into much faster profit growth.
PTC's changing mix also matters. Exchange trades have risen from about 43 per cent of its volumes in FY21 to 56 per cent in FY26. Over the same period, its trading margin has fallen by roughly a fifth. PTC has even deliberately surrendered low-margin exchange volumes in the past when they were uneconomical.
IEX has experienced the opposite effect. Its Real-Time Market, which barely existed five years ago, now contributes nearly 40 per cent of electricity volumes. More trading opportunities create more transactions without requiring a proportionate increase in capital.
And the market they serve is getting bigger
This is not merely a story about India's electricity consumption increasing.
The Central Electricity Authority expects electricity requirements to grow at around 6.5 per cent annually between FY22 and FY32. But organised power markets have been expanding even faster. Electricity traded on power exchanges grew from about 80 BU in FY21 to roughly 144 BU in FY25, a CAGR of about 16 per cent. By FY25, exchanges accounted for 8.5 per cent of total electricity transacted in India.
Renewables add another layer. India had about 275 GW of renewable capacity by March 2026, while non-fossil sources supplied 29 per cent of generation in FY26. Solar and wind output changes with weather and time of day, creating mismatches between when electricity is produced and when consumers need it.
Those mismatches create demand for real-time and short-term trading.
That helps both companies, but differently. PTC can help a DISCOM find the missing electricity. IEX benefits if that DISCOM increasingly goes to an exchange to find it.
But PTC's earnings have another wrinkle
PTC has historically earned more than just its trading margin.
Suppose a DISCOM buys electricity through PTC but pays late. PTC can collect a late-payment surcharge. At the same time, if PTC pays generators promptly, it can earn rebates.
That payment-related income has at times been meaningful.
Now DISCOM finances are improving and payments are arriving faster. This reduces PTC's receivables, working-capital requirement and credit risk. But it also means fewer late-payment surcharges.
The effect was stark in Q1 FY27. Trading volumes rose 12 per cent, yet surcharge income fell 92 per cent, rebate income declined 32 per cent and standalone PAT dropped 33 per cent.
So improving DISCOM health is good for the quality of PTC's business but bad for an income stream it historically enjoyed.
Different risks, different bets
PTC therefore worries about how much it earns on every unit. IEX worries about something bigger: whether its dominant marketplace remains as valuable.
Its liquidity creates a network effect. Buyers go where sellers already are and vice versa. Market coupling could weaken that advantage by pooling bids across exchanges for common price discovery, reducing the importance of liquidity sitting on one individual exchange. CERC continues to pursue the framework, making regulation central to IEX's investment case.
That leaves investors with two very different propositions. IEX is clearly the superior business model. PTC is potentially the cheaper investment proposition.
Both benefit from India's increasingly market-driven electricity system. But one earns the spread while the other collects the toll. The question for investors is whether PTC's lower-quality economics are already reflected in its valuation, or whether IEX's exceptional economics remain valuable enough after accounting for regulatory risk.
Also read: Ola Electric vs Ather Energy: Room to grow, room to fill
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