Judicial review of tariff regulations remains available, but expert performance-based heat-rate norms are not displaced without clear legal infirmity.
Judicial review of electricity tariff regulations remains available under Article 226 because the Appellate Tribunal for Electricity may interpret or apply regulations but cannot examine their validity. The notes distinguish an appeal seeking relaxation of an operating norm from a writ challenge to the validity of that norm. They explain that tariff-setting is a specialised, legislative regulatory function requiring assessment of efficiency, historical performance, technology, operational conditions, financial sustainability and consumer interest. Station-specific heat-rate norms need not be identical for similarly designed units where technical evidence supports differing achievable performance. Courts should not substitute an expert regulator's performance-based assessment absent statutory illegality, procedural breach, manifest unreasonableness or arbitrariness.
Issues: (i) Whether a writ petition challenging the validity of a State Electricity Regulatory Commission tariff regulation was maintainable despite an appeal before the Appellate Tribunal for Electricity concerning relaxation of norms; (ii) Whether the separate Station Heat Rate prescribed for the Dahanu thermal generating station under Regulation 44.2(d) was discriminatory, arbitrary, or contrary to the Electricity Act and the National Tariff Policy.
Issue (i): Whether a writ petition challenging the validity of a State Electricity Regulatory Commission tariff regulation was maintainable despite an appeal before the Appellate Tribunal for Electricity concerning relaxation of norms.
Analysis: The Appellate Tribunal may decide appeals involving interpretation or application of regulations, but lacks jurisdiction to judicially review their validity. A challenge to the validity of regulations framed by a State Commission under delegated legislative power can be pursued under Article 226. The appeal concerning relaxation of the applicable norm and the writ challenge to the validity of the norm were distinct. The prior appellate remedy was disclosed, and no suppression or abuse of process was established.
Conclusion: The writ petition challenging the validity of Regulation 44.2(d) was maintainable; the direction imposing costs for invoking Article 226 was set aside.
Issue (ii): Whether the separate Station Heat Rate prescribed for the Dahanu thermal generating station under Regulation 44.2(d) was discriminatory, arbitrary, or contrary to the Electricity Act and the National Tariff Policy.
Analysis: Tariff regulation is a legislative and specialised exercise requiring the Commission to balance efficiency, past performance, technological and operational factors, financial sustainability, and consumer interest. The National Tariff Policy requires operating norms to be efficient, related to past performance, achievable, and progressively reflective of increased efficiency; it does not require identical norms merely because generating units have similar design specifications. The technical material supported a distinct assessment of the station's historical performance and achievable heat rate. The Commission followed the prescribed regulatory process, considered stakeholder inputs, the tariff policy and technical assessment, and applied the same performance-based methodology to relevant generating stations. Judicial review does not permit substitution of an expert regulator's tariff determination absent statutory breach, manifest unreasonableness, or arbitrariness.
Conclusion: Regulation 44.2(d) of the MERC (Multi Year Tariff) Regulations, 2011 was neither discriminatory nor constitutionally or statutorily infirm; the issue was decided against the petitioner.
Final Conclusion: The validity of the station-specific heat-rate norm was sustained, while preserving the availability of constitutional judicial review against tariff regulations and removing the costs imposed for pursuing that remedy.
Ratio Decidendi: A tariff regulation framed by an expert electricity commission is subject to judicial review for statutory illegality, manifest arbitrariness, or procedural breach, but a court will not replace the regulator's performance-based tariff assessment merely because comparable units have similar technical specifications.