
ALO Law Office- IDT Tax I Arbitration I Litigation
Date: 06.01.2026
Supreme Court Invalidates Retrospective Customs Duty on SEZ-to-DTA Electricity Transfers

This Article has been written by Shri Ravi Shekhar Jha, Advocate based in New Delhi. The views expressed are based on his interpretation of the law. He can be reached at his email id intelconsul@gmail.com or on his Mobile +91-9999005379.β βββ βββ β β β β β
On January 5, 2026, the Supreme Court of India delivered a significant judgment in the case of Adani Power Ltd. & Anr. β vs. Union of India & Ors. β (Civil Appeal No. 22 of 2026), addressing the legality of customs duty imposed on electrical energy generated in Special Economic Zones (SEZs) and supplied to the Domestic Tariff Area (DTA). β This decision marks the culmination of a decade-long legal battle and has far-reaching implications for taxation, judicial precedent, and the rule of law. β
Background of the Case β
Adani Power Ltd., a co-developer of a coal-based thermal power plant located in the Mundra SEZ in Gujarat, challenged the imposition of customs duty on electrical energy supplied from its SEZ unit to the DTA. β Under Section 30 of the Special Economic Zones Act, 2005 (SEZ Act), goods removed from an SEZ to the DTA are chargeable to customs duties “as if such goods had been imported into India.” β However, prior to 2009, electrical energy did not attract customs duty on import, maintaining fiscal neutrality for electricity supplied from SEZs to the DTA. β
In 2010, the Union Government introduced Notification No. β 25/2010-Cus., which imposed a 16% ad valorem customs duty on electrical energy cleared from SEZs to the DTA, with retrospective effect from June 26, 2009. β This notification was challenged by Adani Power Ltd., and in 2015, the Gujarat High Court declared the levy unconstitutional, citing the absence of a lawful charging event, misuse of exemption powers, violation of Article 265 of the Constitution, and arbitrary double taxation. β
The Union Government subsequently issued new notifications (Nos. β 91/2010-Cus. and 26/2012-Cus.) β that imposed reduced per-unit customs duties of ten paise and three paise, respectively, on SEZ-to-DTA electricity clearances. β Adani Power Ltd. filed another writ petition in 2016, seeking a refund of the amounts paid under protest for the period between September 16, 2010, and February 15, 2016, arguing that the 2015 judgment should apply to the subsequent period as well. β
Key Issues Addressed by the Supreme Court
The Supreme Court identified five critical issues for determination:
- Scope and Effect of the 2015 Judgment: The Court held that the 2015 Gujarat High Court judgment was not limited to a single notification or a specific time frame. β Instead, it was a general declaration of law that customs duty could not be levied on SEZ-to-DTA electricity clearances under the statutory framework existing at the time. β
- Changes in Statutory or Factual Footing: The Court found no material changes in the legal or factual basis between the periods before and after September 15, 2010. β The subsequent notifications merely altered the rate and prospective nature of the levy but did not address the fundamental absence of a lawful charging event. β
- Grant of Relief Without Specific Challenges to Later Notifications: The Court rejected the argument that Adani Power Ltd. needed to challenge each subsequent notification separately. β It emphasized that once a levy is declared ultra vires, all derivative attempts to enforce the same levy are equally unenforceable. β
- Effect of Binding Precedent on a Later Coordinate Bench: The Court criticized the Gujarat High Court’s 2019 judgment for narrowing the scope of the 2015 ruling. β It reiterated that a coordinate bench is bound to follow an earlier decision unless it refers the matter to a larger bench for reconsideration. β
- Directions for Refund and Future Compliance: The Court directed the Union of India and customs authorities to refund the amounts deposited by Adani Power Ltd. under protest for the period in question, without interest. β It also prohibited further demands for customs duty on SEZ-to-DTA electricity clearances for the relevant period. β
Key Takeaways from the Judgment
- Limits of Delegated Legislation: The Supreme Court reaffirmed that delegated legislation, such as exemption notifications under Section 25 of the Customs Act, cannot be used to impose a new levy. β The power to exempt is distinct from the power to tax, which rests solely with Parliament. β
- Judicial Precedent: The judgment underscores the importance of judicial discipline and adherence to precedent. β A coordinate bench cannot arbitrarily narrow the scope of an earlier ruling; it must either follow the precedent or refer the matter to a larger bench. β
- Finality of Adjudication: The Court emphasized that once a judicial decision has attained finality, the executive is obligated to conform its conduct to the law declared. β Reintroducing an invalidated levy through successive notifications undermines the rule of law and burdens the judiciary with repetitive litigation. β
- Restitution of Unlawfully Collected Taxes: The Court held that the State cannot retain amounts collected under a levy declared ultra vires. β Restitution is a necessary consequence of the finding of illegality. β
Conclusion
The Supreme Court’s judgment in the Adani Power Ltd. case is a landmark decision that reinforces the principles of constitutional taxation, judicial discipline, and the rule of law. By striking down the levy of customs duty on SEZ-to-DTA electricity clearances, the Court has provided clarity on the limits of delegated legislation and the importance of adhering to judicial precedent. The decision also serves as a reminder to the executive of its obligation to respect and implement judicial pronouncements, ensuring finality in litigation and upholding public confidence in governance.
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Source: Supreme Court
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