The Toll Booth of the Indian Power Grid (That Someone Tried to Dismantle)

India’s Most Profitable Toll Booth You’ve Never Heard Of

Picture this: every time a discom, factory, solar park, or large industrial consumer buys or sells electricity in India’s short-term market, they have to go through a power exchange. And in India, there are exactly two real players in this space. IEX, which has 85% market share. And everyone else, which collectively has 15% and is doing its best.

IEX doesn’t generate electricity. It doesn’t transmit it. It doesn’t store it. It just runs the auction — takes a tiny transaction fee, and goes home. Operating margins of 84%. ROCE of 53.6%. Net profit margin of 77%+. The business model is so capital-light that their fixed assets are just ₹91 crore while they generate ₹462 crore in annual profit. Let that sink in for a moment. Your friendly neighbourhood electricity exchange is essentially printing money on a spreadsheet.

And then came the plot twist. In July 2025, CERC — the electricity regulator — issued an order mandating “market coupling” across power exchanges. Translation: IEX and its smaller competitor would have to merge their order books into one pool run by a third party. IEX, unsurprisingly, did not love this idea. They appealed. The appellate tribunal (APTEL) heard the matter and on February 13, 2026, disposed of the appeal — effectively letting the CERC directive proceed. The market had already been pricing this in since July. The stock dropped from ₹215 to ₹118 in months.

So where does that leave us? A business printing 84% margins, growing volumes at 12–14% annually, staring at a regulatory change that could compress its competitive moat. Is it doomsday, or is the market being dramatic? Let’s find out — with numbers, sarcasm, and the Feb 2026 concall receipts.

They Run an Auction. For Electricity. And Keep Most of the Money.

IEX is an exchange — like NSE, but for electricity. When a power generator has surplus electricity and a factory needs to buy some, they don’t call each other on WhatsApp. They go to IEX, submit bids in a double-sided auction, and IEX’s algorithm matches buyers and sellers, discovers the price, and charges a transaction fee on every unit traded. That’s it. That’s the business. It has the complexity of a lemonade stand and the margins of a toll road in Mumbai.

The main segments are: Day Ahead Market (DAM, 35% of volume), Real Time Market (RTM, 36%), Certificates market including RECs and ESCerts (13%), Term Ahead Market (TAM, 7%), and the growing Green Market (7%). RTM — which lets you buy electricity within an hour of delivery — is the star of the show, growing at 36–38% YoY in volumes and clocking ₹13 BU in Q3 alone.

Beyond electricity, IEX has two subsidiaries that are quietly scaling: Indian Gas Exchange (IGX), India’s first national gas exchange (now profitable, growing at 46% in 9M volumes, IPO plans initiated); and International Carbon Exchange (ICX), which issues international renewable energy certificates and grew i-REC issuance 219% in Q3. There’s also a coal exchange in the works — because apparently IEX wants to be the exchange for every fuel that India runs on.

Q3 FY26: The Numbers Don’t Lie (Even When the Stock Does)