CERC approves transmission tariff for Sirohi Transmission’s ISTS project

The Central Electricity Regulatory Commission (CERC) has approved the annual transmission tariff of Rs 2.91 billion for Sirohi Transmission Ltd, a wholly-owned subsidiary of Power Grid Corporation of India Ltd (PGCIL), for its ISTS scheme. 

This project, named “Transmission system for evacuation of power from Rajasthan REZ Phase IV (Part 2: 5.5 GW) (Jaisalmer/Barmer Complex) Part B,” was awarded to PGCIL under the tariff-based competitive bidding (TBCB) process.

During the bidding, PGCIL’s final winning bid of Rs 2.91 billion was achieved after an 11% reduction from its initial quote of Rs 3.26 billion through the e-reverse auction (e-RA). PGCIL outbid Sterlite Power and Adani Energy Solutions Ltd (AESL) in the process.

The project under Sirohi Transmission Ltd involves constructing a 2×1500 MVA, 765/400 kV substation near Sirohi, a 765 kV double-circuit line (240 km) connecting Sirohi to Fatehgarh-IV, and a 400 kV double-circuit line (160 km) linking Sirohi to Chittorgarh. 

The project is estimated to cost Rs 32.79 billion and is scheduled for completion by August 2026, contributing approximately 800 circuit kilometres (ckm) of transmission lines and 3,000 MVA substation capacity to the ISTS network.

This transmission system is part of a larger scheme for evacuating 5.5 GW from Rajasthan’s REZ, set to be implemented across several components under both TBCB and regulated tariff mechanisms (RTM). PGCIL has secured six of the seven components, with Apraava Energy winning Part A under “Rajasthan IV A Power Transmission Ltd.”