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Ajmer Vidyut Vitran Nigam Ltd. vs. Hindustan Zinc Ltd. and Another

Civil Appeal · 2022 INSC 194Decided 17 Feb 2022
Civil Appeal No. 4124 of 2009
Ajay Rastogi · Abhay S. Oka

Background

Hindustan Zinc Ltd. (HZL) generates its own electricity at a captive plant in Rajasthan and uses the distribution network of Ajmer Vidyut Vitran Nigam Ltd. (AVVNL), a state power distribution company, to send that power ("wheel" it) to its other factories: an arrangement called "open access," governed by a 2006 agreement and regulations set by the Rajasthan Electricity Regulatory Commission. A dispute arose over how "inadvertent" excess electricity drawn beyond the agreed limit should be billed: the original agreement charged it at the cheaper "temporary supply" rate, but the Commission later, in September 2007, changed the rule so this excess would be billed at the costlier "regular supply" rate. AVVNL then tried to apply this costlier rate retrospectively, billing HZL for the period from mid-2006 onward, but the Appellate Tribunal for Electricity ruled the change could only apply from September 2007 onward (prospectively), prompting AVVNL's appeal to the Supreme Court.

Decision Breakdown

The Supreme Court agreed with the Tribunal that the Commission's September 2007 order was not a mere clarification of the existing agreement but a substantial change to its terms. It removed the earlier link to "outage of generating unit" and switched the billing rate entirely from temporary to regular supply tariff. The Court held that such a substantial, financially significant alteration to a commercial agreement cannot be given retrospective effect, since doing so would unfairly prejudice the party (HZL) that had structured its dealings around the original terms; only corrections of clear typographical or unintentional errors could arguably relate back to the agreement's inception. The Court dismissed AVVNL's appeal, upholding prospective application of the changed tariff from 15 September 2007, and directed that money HZL had deposited under an earlier interim court order be adjusted against its future bills.

Lesson Learnt

A regulator or contracting authority cannot dress up a substantive change to the financial terms of an existing agreement as a mere "clarification" and then apply it retrospectively: real changes to a commercial contract's terms take effect only from the date they are actually made, protecting the party that relied on the original terms.

Official source (sci.gov.in)View Judgment (PDF)

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