The Supreme Court of India has agreed to examine a plea filed by the Indian Energy Exchange (IEX) challenging the market coupling mechanism being pushed by the Central Electricity Regulatory Commission, while declining to pass any interim order halting its implementation. The development marks a significant escalation of the market coupling dispute to the country’s highest court.
What is market coupling and why does IEX oppose it?
Market coupling is a mechanism under which bids from all power exchanges are aggregated and matched to determine a single uniform market-clearing price, with the objective of ensuring price discovery through a centralized process rather than through separate exchanges operating independently.
IEX currently holds approximately 85-90% of India’s short-term power trading market share. This dominance is built on its liquidity advantage — the deepest pool of buyers and sellers in the market. Under market coupling, bids from all exchanges are pooled simultaneously, so price discovery happens across platforms at once. The result: it no longer matters which exchange you trade on. IEX’s liquidity advantage disappears.
The full timeline of the dispute
The dispute began when CERC issued directions on July 23, 2025, for the phased implementation of market coupling in the Day-Ahead Market. This resulted in a massive 30% plunge in IEX share price in a single trading session, reflecting market apprehensions over the business impact.
IEX challenged the CERC’s move, arguing that the directions were anti-competitive in nature and aimed at redistributing its market share to rival exchanges. APTEL asked IEX to file a revised plea including new respondents such as Grid Corporation of India, Power Exchange India, and Hindustan Power Exchange.
At a January 6, 2026 APTEL hearing, the tribunal questioned the rationale and timing of market coupling, raising critical red flags including lack of empirical evidence showing market failure under the current system, absence of a cost-benefit analysis, concerns over implementation without adequate stakeholder consensus, and questions around whether coupling truly benefits end consumers. IEX stock rallied sharply following those observations.
However, in its judgment dated February 13, 2026, APTEL disposed of IEX’s appeal. The Tribunal observed that market coupling cannot be implemented unless and until CERC notifies specific regulations to operationalize the mechanism — and as of that date, even draft regulations had not been issued. Critically, APTEL clarified that once formal regulations are notified, IEX would have the liberty to challenge both the new regulations and the earlier directions before an appropriate legal forum.
Following the APTEL disposal, the regulatory overhang shifted from an immediate threat to a slower, regulation-led overhang hanging over every quarter. IEX subsequently approached the Supreme Court — which has now agreed to examine the plea while refusing to grant interim relief against market coupling.
What does today’s Supreme Court development mean?
The Supreme Court’s decision to examine the plea keeps IEX’s legal challenge alive at the highest judicial level, which is significant. However, the refusal to pass an interim order against market coupling means CERC can continue its regulatory process of framing formal market coupling regulations without a court-imposed pause.
The risk for IEX has not gone away — it has shifted from an immediate threat to a slower, regulation-led overhang. Analysts project that market coupling could reduce IEX’s market share from its current dominant position to as low as 33% over time as competitors like Hindustan Power Exchange and Power Exchange India gain ground on a level playing field.
The matter will now be heard by the Supreme Court on a date to be fixed.
This is a developing legal story. Business Upturn will update coverage as the Supreme Court proceedings progress.
Disclaimer: This article is for informational purposes only and does not constitute investment advice. Investors are advised to consult a registered financial advisor before making any investment decisions. Business Upturn does not hold any position in the securities mentioned.