Regulator levels playing field in power trade, sinking IEX stock

Shares of Indian Energy Exchange Ltd (IEX), the leading platform in India’s electricity trading market, plummeted by more than 23% on Thursday after the Union electricity regulator ordered the synchronization of prices across competing power exchanges, a move aimed at improving transparency and efficiency but one that could erode IEX’s market dominance.

The Central Electricity Regulatory Commission (CERC) on Wednesday announced that all day-ahead market (DAM) transactions, where electricity for the next day is bought and sold, will be price-coupled across all exchanges beginning January.

The policy, often referred to as market coupling, seeks to eliminate price variation between platforms by consolidating buy and sell bids and discovering a uniform clearing price through a centralized algorithm.

While common in many developed markets, the reform is a major structural shift in India’s power sector, where IEX controls about 99% of the day-ahead market, largely due to the liquidity advantage that comes from being the biggest and oldest exchange.

The market responded swiftly.

IEX shares fell as much as 25.9% to ₹139.05 in morning trading on NSE, before paring some losses later in the day. The decline marked the steepest intraday fall since the company was listed in 2017.

Under the current system, IEX benefits from a self-reinforcing cycle: since it attracts the most trade, it often ends up offering more competitive prices, which in turn attracts even more volume.

The new rules, however, will level the playing field, making price the same across IEX and its smaller rivals: Power Exchange India Ltd (PXIL) and the recently launched Hindustan Power Exchange (HPX).

CERC’s decision follows the results of a pilot project that demonstrated significant economic benefits from market coupling. The trial showed that unifying price discovery across platforms could reduce inefficiencies, minimize price spikes, and create a more robust power market.

Officials at CERC said the move aligns with the regulator’s broader goals of reducing market fragmentation, deepening competition, and ensuring fair access to electricity trading infrastructure.

While market coupling will begin with the day-ahead market, the regulator is also considering applying the same model to real-time markets, where electricity is traded closer to delivery. A decision on that is expected later this year.

For power producers and buyers, including state-owned distribution companies (discoms), industrial units, and large commercial consumers, the reform is expected to increase pricing transparency and offer equal access to all platforms.

However, for IEX, the decision could mark the end of a long-held market advantage.

The exchange has consistently reported high trading volumes, and its monopoly in the day-ahead segment has been a key driver of its earnings.

Market coupling has been under discussion for several years but has faced resistance from entrenched players. The formal rollout now puts pressure on IEX to diversify its offerings, cut costs, and compete on service quality, rather than just liquidity.