Supreme Court: “Patent Illegality” Cannot Be Invoked to Re-Appreciate Evidence or Substitute Court’s View for Arbitrator’s Findings

Aadrikaa Legal Services (ALS)- Law I Litigation I Arbitration

Date: 12.09.2026

Supreme Court: “Patent Illegality” Cannot Be Invoked to Re-Appreciate Evidence or Substitute Court’s View for Arbitrator’s Findings

In a significant judgment governing judicial interference with arbitral awards, the Supreme Court has restored an arbitral award of ₹3.71 crore with statutory interest in favour of contractor Ramesh Kumar Jain against Bharat Aluminium Company Limited (BALCO), holding that the Chhattisgarh High Court exceeded the limited jurisdiction available under Section 37 of the Arbitration and Conciliation Act, 1996 by effectively re-appreciating evidence and substituting its own interpretation for that of the arbitrator.

The Court reiterated that an arbitral award cannot be set aside merely because a court considers another interpretation of the evidence or contractual arrangement to be more plausible. The threshold of “patent illegality” requires something substantially more serious than an erroneous factual assessment or a difference of opinion with the arbitrator.

Background of the Dispute

• BALCO had invited tenders for mining and transportation of 3,70,000 metric tonnes of bauxite from its Mainpat mines to the Korba Alumina Plant. Ramesh Kumar Jain submitted the lowest bid, and after negotiations an agreement dated 11 December 1999 was entered into for mining and transportation of 2,22,000 MT of bauxite at ₹634.20 per MT.
• The work was originally required to be completed within 18 months, by May 2001, but was extended until September 2001. After the contracted quantity had been supplied, BALCO requested Jain, through a letter dated 5 January 2002, to continue the mining and transportation work, with the rate for the additional work to be decided subsequently after consultation.
• Jain continued the work and supplied approximately 1,95,000 MT of additional bauxite between 16 June 2001 and 31 March 2002. A dispute thereafter arose regarding payment for the additional work, resulting in invocation of the arbitration clause. The High Court eventually referred the dispute to arbitration under Section 11(6) of the Arbitration Act.

Arbitrator Awards ₹3.71 Crore With Statutory Interest

• After considering the pleadings and evidence and framing 13 issues, the sole arbitrator passed an award dated 15 July 2012 in favour of Jain.
• The award covered, among other things, compensation for additional work, increased transportation costs arising from restrictions on truck capacity, idle manpower and machinery during a strike period, and interest attributable to delay in payment of a running-account bill. The aggregate amount of the substantive claims, inclusive of the specified pre-award interest, was ₹2,34,57,783.
• The arbitrator further awarded 12% interest from 1 September 2007 to 15 July 2012 amounting to ₹1,37,22,801, bringing the total award to ₹3,71,80,584, along with statutory interest under Section 31(7)(b) from the date of the award until payment.

Commercial Court Upholds Award, High Court Sets It Aside

• BALCO challenged the award under Section 34 of the Arbitration and Conciliation Act. The Commercial Court, Raipur, rejected the challenge on 2 January 2017, finding that the arbitrator had rendered reasoned findings on the claims after considering the oral and documentary evidence and that the award could not be characterised as arbitrary or capricious.
• BALCO thereafter approached the Chhattisgarh High Court under Section 37. The High Court allowed the appeal on 3 May 2023 and set aside the arbitral award that had been affirmed by the Commercial Court.
• This brought the original claimant, Ramesh Kumar Jain, before the Supreme Court.

Supreme Court: Section 37 Does Not Permit Re-Appreciation of Evidence

• The Supreme Court framed the central question as whether the High Court could interfere with the arbitral award on the ground of patent illegality under Section 37 after the award had already survived scrutiny under Section 34.
• The Court emphasised the legislative policy of minimal judicial intervention in arbitration. Section 34 provides only a narrow supervisory jurisdiction, and courts exercising that jurisdiction do not sit as appellate courts over arbitral awards.
• More importantly, the scope of scrutiny under Section 37 is not wider than Section 34. The Court relied upon authorities including MMTC Ltd. v. Vedanta Ltd., Konkan Railway Corporation Ltd. v. Chenab Bridge Project Undertaking and Hindustan Construction Company Ltd. v. NHAI to reiterate that Section 37 does not enlarge the appellate court’s power to reassess an arbitral award.
• The Supreme Court further observed that the scope of interference under Section 37 is even narrower where the arbitral award has already been upheld or substantially upheld under Section 34. Reassessment or re-appreciation of evidence lies outside the permissible contours of judicial review under both provisions.

What Constitutes “Patent Illegality”?

• The judgment contains an important exposition of the meaning of patent illegality in arbitration law.
• Following the 2015 amendment to Section 34, an award cannot be set aside merely because there has been an erroneous application of law or because a court would appreciate the evidence differently. The illegality must go to the root of the award.
• The Supreme Court explained that an award may be vulnerable where an arbitrator ignores a binding precedent or an express contractual prohibition, or where a finding is based on no evidence at all. But if there is some evidence on the record from which the arbitrator has drawn a reasonably plausible inference, a court should ordinarily not substitute its own view.
• The Court made an especially important distinction between “no evidence” and weak or scant evidence. Patent illegality may arise when a crucial conclusion has absolutely no evidentiary basis. However, where even some relevant evidence exists—including witness testimony or documents—the court cannot label the award patently illegal merely because it considers that evidence to have low probative value.

Arbitrator Is the Master of Facts and Evidence

• On examining the award, the Supreme Court found that the arbitrator had considered both oral and documentary material, including the evidence of claimant R.K. Jain and BALCO’s Assistant General Manager/Engineer-in-Charge, along with affidavits and correspondence.
• The Court noted that the arbitrator had not mechanically accepted every claim. Certain claims were reduced while another claim relating to removal of extra overburden was rejected altogether. This demonstrated an application of mind rather than arbitrary acceptance of the contractor’s calculations.
• The Supreme Court therefore rejected the High Court’s conclusion that the award was founded merely upon guesswork or lacked evidence.

Arbitrator Can Apply Quantum Meruit Where Contract Is Silent

• Another major aspect of the ruling concerns Section 70 of the Indian Contract Act, 1872 and the principle of quantum meruit.
• The Supreme Court clarified that an arbitrator cannot make an award contrary to an express contractual prohibition. However, where the contract is simply silent on a legitimate claim naturally arising from the parties’ contractual relationship, the tribunal can interpret implied terms or fill the contractual gap, provided it does not contradict an express provision.
• Section 70 creates a restitutionary obligation where one person lawfully does something for another without intending it to be gratuitous and the other person enjoys the resulting benefit. In such circumstances, compensation may be payable for the benefit received.

₹10 Per MT Additional Compensation Did Not Rewrite Contract

• BALCO had contended—and the High Court had accepted—that the arbitrator effectively rewrote the contract by increasing the compensation for additional work by ₹10 per MT.
• The Supreme Court disagreed.
• It found that after the earlier contractual period, Jain continued mining and transporting an additional 1,95,000 MT of bauxite at BALCO’s request, while the price for such additional work had expressly been left open to be settled subsequently by mutual consensus. That exercise was never completed.
• In those circumstances, the arbitrator did not rewrite an agreed contractual rate. Rather, he filled a contractual vacuum by awarding reasonable compensation under Section 70 of the Contract Act to prevent unjust enrichment.
• The additional ₹10 per MT—raising the rate from ₹634.20 to ₹644.20 per MT—was therefore treated as reasonable compensation for additional work rather than an impermissible modification of an agreed contractual term.
• The Supreme Court further held that claims based on quantum meruit or unjust enrichment can be determined in arbitration where they fall within the scope of disputes referred to the tribunal, either expressly or by necessary implication.

“Guesswork” Does Not Automatically Make an Award Patently Illegal

• The Supreme Court also rejected the High Court’s reasoning regarding percentage-based or approximate calculations adopted by the arbitrator.
• It held that the alleged errors concerning lack of evidence or percentage-based allowances did not, individually or cumulatively, reach the threshold of patent illegality. There was at least some evidence and logical reasoning supporting each component of the award, and the arbitrator’s conclusions constituted a possible view that a reasonable decision-maker could take.
• The Court also stressed that arbitrators are not bound by strict rules of evidence, having regard to Section 19 of the Arbitration Act. A court cannot interfere simply because an arbitrator’s reasoning is brief, so long as the reasoning path leading to the conclusion can be discerned.

Supreme Court Restores Arbitral Award

• Ultimately, the Supreme Court held that the Chhattisgarh High Court had impermissibly re-appreciated the evidence and substituted its own interpretation for that of the arbitrator while exercising its limited jurisdiction under Section 37.
• Accordingly, the Supreme Court allowed Ramesh Kumar Jain’s appeal and set aside the High Court judgment dated 3 May 2023.
• As a consequence, the Commercial Court’s judgment dated 2 January 2017 affirming the arbitral award dated 15 July 2012 was restored. The ₹3.71 crore arbitral award, together with the statutory interest directed by the arbitrator, therefore stands revived.

Significance of the Judgment

• The ruling reinforces three important principles of Indian arbitration law.
• First, Sections 34 and 37 do not provide courts with appellate jurisdiction over the merits of an arbitral award. Secondly, “patent illegality” cannot become a device for reopening factual findings merely because another interpretation appears preferable. Thirdly, where a contract is silent regarding compensation for additional work that was requested and accepted, an arbitral tribunal may, in an appropriate case, apply Section 70 of the Contract Act and principles of quantum meruit/unjust enrichment to determine reasonable compensation.

The judgment therefore strengthens the principle of arbitral finality and minimal judicial interference, while also clarifying the dividing line between an arbitrator impermissibly rewriting a contract and legitimately filling a contractual vacuum arising from additional work performed and accepted by the other party.

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Source: Supreme Court

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