Spectrum Power Generation Limited filed a petition under Section 34 of the Arbitration and Conciliation Act, 1996 before the Delhi High Court challenging an arbitral award dated 30.09.2024. The dispute arose from a Gas Sale Agreement (GSA) dated 18.12.2015 between the petitioner and GAIL India Limited, wherein after GST implementation, GAIL raised invoices for reimbursement of GST on natural gas transmission charges. The petitioner argued that the transaction was taxable under the Andhra Pradesh Value Added Tax Act, 2005 and not under GST, and that no actual transmission by GAIL to the petitioner occurred. The arbitral tribunal had rejected the petitioner's claim, holding that the GSA obligated the petitioner to reimburse the tax paid, that the petitioner had waived its right to object by paying without demur for over three years, and that the respondent had deposited the collected GST with the authorities. The High Court's analysis, as reproduced in the judgment text, examined the three facets addressed by the tribunal — contractual obligation to reimburse, actual deposit of GST, and estoppel/waiver — within the limited scope of judicial review available under Section 34 of the Act.