Post-award interest runs on principal and pre-award interest together: Supreme court in UHL power company ltd. v. state of Himachal Pradesh

Supreme Court Decision: Post-Award Interest on Principal and Pre-Award Interest Affirmed in UHL Power Company Ltd. v. State of Himachal Pradesh

One of the more persistent debates in Indian arbitration law has been whether an arbitral tribunal can lawfully award interest on interest, and whether post-award interest must attach only to the principal sum or to the entire amount directed to be paid. The Supreme Court of India put this debate to rest in UHL Power Company Ltd. v. State of Himachal Pradesh, decided on January 7, 2022, by restoring the arbitral award of compound interest and reaffirming the position settled in Hyder Consulting (UK) Ltd. v. State of Orissa.

The Background

UHL Power Company Ltd. had entered into an implementation agreement with the State of Himachal Pradesh for the development of a hydroelectric project. A dispute arose, and the sole arbitrator passed an award on June 5, 2005 granting UHL substantial amounts towards expenses, with compound interest at nine percent per annum capitalised annually on those expenses up to the date of the claim, and future interest at eighteen percent per annum on the principal claim with interest in the event of non-realisation within six months.

The State challenged the award under Section 34 of the Arbitration and Conciliation Act, 1996. A Single Judge of the Himachal Pradesh High Court disallowed UHL's entire claim. UHL filed an appeal under Section 37, and the Division Bench, while partly restoring the claim, limited interest to simple interest at six percent per annum from the date of filing the claim on the principal amount alone. In doing so, the Division Bench relied on State of Haryana v. S.L. Arora, which had held that arbitral tribunals lack the power to award interest on interest. UHL appealed to the Supreme Court.

The Law: S.L. Arora Overruled

By the time the matter reached the Supreme Court, the very foundation of the Division Bench's reasoning had collapsed. The three-Judge Bench in Hyder Consulting (UK) Ltd. v. State of Orissa had expressly overruled S.L. Arora. The majority view in Hyder Consulting, as articulated by Justice S.A. Bobde and Justice A.M. Sapre, held that the word 'sum' in Section 31(7)(b) of the Act carries its ordinary meaning of any amount of money directed to be paid by the award. Once pre-award interest is included in the amount directed to be paid under Section 31(7)(a), the principal and the interest component merge into a single sum and lose their separate identities. Post-award interest then attaches to this merged sum. What follows is not technically interest on interest in the classical sense; it is simply interest on the total sum directed to be paid by the award.

Justice Sapre, in his concurring opinion in Hyder Consulting, observed that the statute makes no distinction between a sum with interest and a sum without interest for the purposes of an award. Once interest is included in the sum, the interest component takes on the character of the awarded sum itself. Post-award interest under Section 31(7)(b) is not discretionary in the same way as pre-award interest under Section 31(7)(a); it is a statutory mandate, with the arbitrator retaining discretion only over the rate.

What the Court Decided

A Bench comprising Chief Justice N.V. Ramana and Justices A.S. Bopanna and Hima Kohli set aside the Division Bench's finding that the arbitral tribunal was not empowered to grant compound interest. Since that finding was based entirely on S.L. Arora, which had since been overruled, it could not stand. The Supreme Court restored the arbitral award to the extent it dealt with the interest component, allowing UHL's claim for compound interest.

On the second issue concerning the scope of review under Sections 34 and 37, the Court restated the well-established principle that a court examining an arbitral award under Section 34 does not sit as a court of appeal. The learned Single Judge had committed a gross error in re-appreciating the evidence and substituting his own view for that of the arbitrator on the interpretation of the relevant contractual clauses. The Division Bench rightly reversed this but fell short on the interest question. The Supreme Court corrected that gap.

The Court also confirmed that the MoU dated February 10, 1992 had merged into the implementation agreement dated August 22, 1997 by virtue of the second recital and Clause 2.2 of the implementation agreement, which defined the word 'Agreement' to include all appendices and annexures. The MoU, being Appendix A, was therefore part and parcel of the implementation agreement and all disputes arising from it were referable to arbitration under Clause 20.

What This Means in Practice

For parties in arbitration, particularly in infrastructure and long-term project contracts, this ruling has direct consequences for how awards are structured and enforced. An arbitrator awarding amounts for prolonged disputes spanning several years can lawfully include pre-award interest in the sum and direct that post-award interest attaches to the aggregate. This ensures that creditors are not penalised for the passage of time, and it discourages award-debtors from strategically delaying enforcement in the hope of reducing their exposure.

The ruling equally reaffirms the narrow scope of judicial review under Sections 34 and 37. Where the arbitrator has adopted a plausible interpretation of the contract, courts cannot substitute an alternative view merely because one exists. The commercial wisdom behind choosing arbitration is undermined each time courts act as courts of first appeal over factual findings.

UHL Power Company Ltd. v. State of Himachal Pradesh, Civil Appeal Nos. 10341-10342 of 2011, decided on January 7, 2022, reported as (2022) 4 SCC 116.