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Issues: (i) Whether the contractual interpretation requiring reimbursement of GST paid on gas-transmission charges was liable to interference under Section 34; (ii) Whether the finding that GST had been deposited with the authorities was sustainable without deciding the objection to admissibility of the tax receipts; (iii) Whether the petitioner was barred by waiver, estoppel, or Clause 12.6 of the Gas Sale Agreement from claiming reimbursement.
Issue (i): Whether the contractual interpretation requiring reimbursement of GST paid on gas-transmission charges was liable to interference under Section 34.
Analysis: The dispute in arbitration was confined to contractual reimbursement and did not require determination of the statutory exigibility of GST, which lay within the jurisdiction of the GST authorities. The contractual construction that title passed at the delivery point and that VAT was payable on a price inclusive of the GST component was a plausible interpretation of the Gas Sale Agreement. A possible and reasonable contractual interpretation cannot be substituted in arbitral-review jurisdiction merely because another view is available.
Conclusion: The finding that tax actually paid was contractually reimbursable was not independently open to interference and was in favour of the respondent.
Issue (ii): Whether the finding that GST had been deposited with the authorities was sustainable without deciding the objection to admissibility of the tax receipts.
Analysis: The arbitral tribunal deferred the objection to the admissibility of GST deposit receipts but did not determine it before relying on those receipts. The receipts, unsupported by GST returns, purchase and sale records, filed documents, or books of account, did not establish payment of GST attributable to gas transmitted to the petitioner. Non-cross-examination on documents whose admissibility remained undecided did not relieve the respondent of its burden to prove payment.
Conclusion: The finding that the respondent deposited GST on the transmission charges was perverse for want of admissible evidence and was in favour of the petitioner.
Issue (iii): Whether the petitioner was barred by waiver, estoppel, or Clause 12.6 of the Gas Sale Agreement from claiming reimbursement.
Analysis: Waiver requires a conscious and intentional abandonment of a known right, and the party asserting it bears the burden of proof. Estoppel requires an unequivocal representation intended to be acted upon, actual reliance, and alteration of position. Neither the requisite knowledge and intentional relinquishment nor a representation, reliance, and change of position by the respondent was established. Clause 12.6 required payment before a quantified claim could be lodged, supporting the position that payment was necessary to preserve uninterrupted supply. Each invoice gave rise to a recurring cause of action; payment of earlier invoices did not extinguish claims arising from subsequent invoices, including invoices issued after objection was raised.
Conclusion: The findings of waiver, estoppel, and a complete bar under Clause 12.6 were patently illegal and were in favour of the petitioner.
Final Conclusion: The evidentiary and contractual-bar findings forming the basis for rejecting the reimbursement claim were unsustainable, rendering the arbitral award liable to be set aside.
Ratio Decidendi: An arbitral finding founded on documents whose admissibility was left undecided and on unproved waiver or estoppel suffers from patent illegality; prior payment under a contract requiring payment before dispute does not by itself establish waiver, estoppel, or extinguish recurring claims.
Arbitral review: unproved GST payment and unsupported waiver or estoppel can render reimbursement findings patently illegal.
Arbitral review under Section 34 is discussed as limited where an award adopts a plausible contractual interpretation, particularly on reimbursement of GST paid on gas-transmission charges; statutory GST liability remains for GST authorities. The notes identify patent illegality where a tribunal relies on GST deposit receipts after leaving their admissibility undecided, without supporting returns, transaction records or accounts proving payment attributable to the claimant. They further explain that waiver requires intentional relinquishment of a known right, while estoppel requires representation, reliance and alteration of position. Contractual pre-dispute payment requirements and payment of earlier invoices do not, by themselves, establish waiver, estoppel or extinguish recurring claims.
Scope of contractual interpretation requiring reimbursement of GST paid on gas-transmission charges - interference under Section 34 - Reliance on inadmissible evidence in arbitral proceedings - Waiver and estoppel in contractual reimbursement claims - Recurring cause of action under invoice-based claims - Plausible Interpretation of Contract - Patent Illegality - Principles of Natural Justice - Burden of Proof - levy or collection of GST on the sale of gas and the transactions is taxable under AP VAT Act Reimbursement of GST paid on transmission charges under the Gas Sale Agreement - HELD THAT: - The tribunal, though not decided the issue of exigibility of GST on the transmission of gas but relied upon Notification No. 11/2017-Central Tax (rate) issued on 28.06.2017 wherein the rate of tax on transportation of natural gas was stipulated. The tribunal's interpretation that the contractual tax-paid component was reimbursable by the buyer was a plausible construction of the Gas Sale Agreement, including the provision transferring title in gas at the delivery point. The Court held that interpretation of contractual terms ordinarily lies within the arbitral tribunal's domain and cannot be substituted merely because another view is possible, unless the construction is one no reasonable person could adopt or disregards the contract. [Paras 11, 12] The tribunal's construction of the contractual reimbursement obligation did not by itself warrant interference. Proof of GST deposit - Admissibility of documentary evidence in arbitration - Natural justice in arbitral proceedings - HELD THAT: - The division bench of Bombay High Court in Bi-Water Penstocks Ltd [2010 (11) TMI 1148 - BOMBAY HIGH COURT] held that the admission of documents without having been proved is not only a procedural defect but also a violation of the principles of natural justice. The tribunal had deferred the petitioner's objection to the admissibility of the tax-deposit receipts but never determined it. It nevertheless treated those receipts as establishing deposit of GST, although no GST returns, purchase or sale records, supporting documents, or books of account were produced to connect the alleged deposits with gas transmitted to the petitioner. Non-cross-examination on documents whose admissibility remained undecided could not cure the respondent's failure to prove the deposit. Reliance upon unproved documents despite objection constituted a procedural error offending natural justice, and the finding of deposit was perverse. [Paras 16, 17, 18, 19, 20] The finding that the respondent had deposited GST on the transmission charges was unsustainable for want of admissible evidence. Waiver of contractual rights - Estoppel by representation - Recurring cause of action for invoice claims - Whether payment of earlier invoices barred the petitioner from disputing reimbursement of GST under the contractual invoice-dispute clause. - HELD THAT: - It is trite law that waiver and estoppel cannot be used interchangeably. In Hindustan Construction Co. Ltd. [2025 (11) TMI 2042 - SUPREME COURT], it was held: “68. Though waiver, acquiescence, and estoppel are often discussed together in arbitral jurisprudence, they occupy distinct conceptual spaces. Waiver is the intentional relinquishment of a known right; acquiescence arises from passive acceptance or delay; and estoppel precludes a party from resiling from a representation on which the other has relied. The Act, however, incorporates only the doctrine of waiver — presuming parties to be conscious of their conduct and its consequences. The Act elevates silence to waiver by importing an element of intent, thereby preventing parties from approbating and reprobating. A party who has actively participated or consented to continuation of the proceedings cannot later challenge the same process merely because the result is adverse. The legislative design thus discourages tactical objections and multiplicity of proceedings.” Waiver requires proof that a party, with full knowledge of its right, intentionally relinquished it; estoppel requires an unequivocal representation, reliance by the other party and alteration of position. The respondent produced no evidence satisfying the requirements of waiver, and its statutory liability to deposit GST did not arise from or depend upon any representation by the petitioner. Further, the invoice clause required payment before a claim could be lodged and therefore supported the contention that payment was necessary to preserve uninterrupted gas supply. Each invoice claiming reimbursement gave rise to a recurring cause of action; payment of earlier invoices, including where later invoices were issued after objections were raised, could not alone bar the claim. [Paras 26, 27, 29, 30, 31] The findings of waiver and estoppel, and the rejection of the entire claim for failure to object to earlier invoices, were patently illegal. Final Conclusion: The arbitral award was set aside because its findings on deposit of GST, waiver and estoppel rested on inadmissible or insufficient evidence and erroneous application of the governing legal principles. The petition was allowed.