### Implied terms under business efficacy cannot override express fixed-price contractual obligations.

The Appellant (JSW) and Respondent (GAIL) entered into a Gas Supply Agreement (GSA) in 1991.

A 1998 Supplementary Agreement substituted a formula-based service charge with a fixed monthly transportation charge of Rs. 38,67,600/-.

Article 12.03 of the GSA was amended to require the buyer to dispute invoices within 14 days, stipulating that failure to do so constituted an "absolute waiver" of the claim and the right to arbitration.

Following a shortfall in gas supply due to government-mandated allocations (Force Majeure), JSW sought a refund of proportionate transportation charges.

An Arbitral Tribunal awarded JSW Rs. 14.67 crores, applying "business efficacy" and "partial failure of consideration" to reduce fixed charges despite the Force Majeure.

A Single Judge set aside the award under Section 34, primarily on grounds of limitation and the Tribunal’s failure to consider the waiver clause in Article 12.03.

JSW appealed under Section 37.

The court applied Section 34 and Section 37 of the Arbitration and Conciliation Act, 1996, highlighting that judicial interference is restricted to "patent illegality," "public policy," or "jurisdictional error".

It relied on *Jan De Nul Dredging India v. Tuticorin Port Trust* regarding the limited scope of Section 37.

It relied on *Ramesh Kumar Jain v. BALCO* for the definition of "patent illegality" (ignoring vital evidence or irrational findings).

The "Business Efficacy" doctrine was governed by *M/s Adani Power (Mundra) Ltd. v. GERC*, which requires an implied term to be "necessary" and satisfy the "officious bystander test".

Regarding limitation, the court applied *Reliance Industries Ltd. v. GAIL (India) Ltd.*, holding that labelling invoices as "provisional" does not indefinitely extend the limitation period.

The Court found that the Tribunal committed a patent illegality by ignoring the amended Article 12.03, which was a "vital contractual stipulation" acting as a condition precedent to arbitration.

On the merits, the Court held the Tribunal’s reasoning on "business efficacy" was "impossible" and "irrational".

It reasoned that since the parties deliberately replaced a variable charge with a "fixed" charge in 1998, the Tribunal could not use business efficacy to rewrite the contract and restore proportionality, especially when the contract already contemplated reduced supply.

The Court found the award internally contradictory: the Tribunal acknowledged Force Majeure justified the short supply but then penalized GAIL by refunding the fixed charges.

Furthermore, the Tribunal provided "no intelligible reasoning" on limitation, failing to explain why the 14-day contractual bar did not apply.

It held that the Arbitral Award was vitiated by perversity and patent illegality.

The Court affirmed the Single Judge's finding that the claims were barred by limitation and that labelling invoices as "provisional" did not bypass the statutory or contractual time limits.

The Court struck down the Tribunal's pro-rata reduction of fixed charges, ruling that a tribunal cannot use "business efficacy" to fundamentally alter a fixed-price contractual structure.

The award was set aside in its entirety.