IEX shares fall 4% after Supreme Court denies hearing market coupling case

Indian Energy Exchange shares fell 4% after the Supreme Court said it was not the appropriate stage to hear the company's case against market coupling and allowed the Central Electricity Regulatory Commission to proceed with framing regulations.

The court also clarified that it was not expressing any opinion on the merits of the matter.

The order keeps the regulatory overhang alive for IEX, India’s dominant power exchange. Market coupling is seen as a key risk for the company because it could reduce the advantage IEX gets from its strong liquidity and price discovery in electricity trading.


Under market coupling, buy and sell bids from different power exchanges are pooled to arrive at a uniform market-clearing price. The aim is to improve price discovery and market efficiency across power exchanges. But for IEX, the concern is that exchanges could be reduced to platforms for collecting bids, while price discovery moves to a central mechanism.

Why the market is worried

IEX has been the biggest player in India’s power exchange market. That dominance has been a major part of its business model because more buyers and sellers on one platform usually mean better liquidity and stronger price discovery.

Market coupling can change that structure. If a common price is discovered across exchanges, customers may have less reason to prefer one exchange only because it has deeper liquidity.

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CERC had earlier planned to start market coupling in a phased manner from January 2026, beginning with the day-ahead market segment, Reuters reported. The plan was to merge electricity bids across platforms to improve price discovery and system efficiency.

Earlier in May, the Supreme Court agreed to examine IEX’s appeal against CERC’s order on market coupling, but refused to stay the Appellate Tribunal for Electricity order that had allowed the regulator to proceed. The case relates to CERC’s move to implement market coupling for the day-ahead market and amend regulations accordingly.

In the latest development, the Supreme Court has again not stopped CERC from moving ahead with the regulatory process. The court’s clarification that it has not expressed any opinion means the larger legal issue is still open, but investors did not get immediate relief.

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