ISTS

Regulatory Updates

CERC notifies third amendment to ISTS connectivity and GNA rules
By September 2, 2025September 2, 2025

The Central Electricity Regulatory Commission (CERC) issued the Connectivity and General Network Access (GNA) to the inter-State Transmission System (ISTS) (Third Amendment) Regulations, 2025 on 31 August 2025. The amendments revise multiple provisions related to renewable energy generating stations (REGS), hybrid projects, and energy storage systems (ESS). New definitions and classificationsThe amendment introduces several new terms. “Cluster of ISTS substations” refers to groups of substations declared by the Central Transmission Utility (CTU) based on location,…

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Power ministry relaxes location norms for load-serving substations under ISTS
By April 7, 2025April 7, 2025

The power ministry has relaxed siting norms for load-serving substations under interstate transmission system (ISTS) schemes built through the tariff-based competitive bidding (TBCB) route. The revised norms apply to new substations—such as switching stations or HVDC terminals—developed by transmission service providers (TSPs). The change follows industry representations and is now reflected in the amended standard bidding documents (SBD), including the request for proposal (RfP) and transmission service agreement (TSA). Under the updated rule: Generation pooling…

Read More Power ministry relaxes location norms for load-serving substations under ISTS
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Hindustan Powerprojects to set up 300 MW solar project for UPPCL
By April 7, 2025April 7, 2025

Hindustan Powerprojects Private Limited (HPPPL) has secured a Letter of Award (LoA) from Uttar Pradesh Power Corporation Limited (UPPCL) for a 300 MW/425 MWp solar project. The installation will be Inter-State Transmission System (ISTS)-connected and located in Madhya Pradesh. The project is part of UPPCL’s plan to develop 2,000 MW of ISTS-connected solar capacity across India. HPPPL will be responsible for identifying land, setting up the plant, owning it, and maintaining it. The project will…

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NTPC, Sembcorp, Solarcraft , Hero Solar, Reliance Power win bids in SECI Tranche XVII auction
By December 11, 2024July 17, 2025

Five firms have won bids for setting up 2,000 MW Inter-State Transmission System (ISTS) connected solar power projects and 1,000 MW energy storage systems (ESS) under Tranche-XVII of the Solar Energy Corporation of India (SECI), announced on December 9, 2024. The successful bidders and their respective capacities are as follows: Sembcorp Green Infra Private Limited (Sembcorp Energy India Limited) – 150 MW solar and 75 MW ESS at a tariff of Rs 3.52 per kWh…

Read More NTPC, Sembcorp, Solarcraft , Hero Solar, Reliance Power win bids in SECI Tranche XVII auction
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CERC approves transmission tariff for Sirohi Transmission’s ISTS project
By October 30, 2024October 30, 2024

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…

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Powerica wins SECI auction for 500 MW ISTS wind power project
By October 30, 2024October 30, 2024

Powerica has secured a 50 MW capacity in the Solar Energy Corporation of India’s (SECI) undersubscribed auction for a 500 MW interstate transmission system (ISTS)-connected wind power project (Tranche-XVII). The company won the allocation at a tariff of Rs 3.81 per kWh. Due to an undersubscription, only 120 MW of the 500 MW was bid, resulting in SECI reducing the total award to 96 MW, per the tender’s 80% allocation provision. Adyant Enersol also participated,…

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Sembcorp, Adani, Green Prairie, Adyant Enersol and ReNew win NTPC’s 1.2 GW Wind-Solar Auction
By October 28, 2024October 28, 2024

Sembcorp Green Infra, Adani Renewable Energy, Green Prairie Energy III (EverGreen), Adyant Enersol (DATTA INFRA), and ReNew Solar have been selected as winners in NTPC’s auction to develop inter-state transmission system (ISTS) connected wind-solar hybrid power projects with a total capacity of 1.2 GW. Green Prairie Energy and Adyant Enersol secured 200 MW and 70 MW, respectively, at a tariff of Rs 3.28 per kWh. Sembcorp Green Infra, Adani Renewable Energy, and ReNew Solar were…

Read More Sembcorp, Adani, Green Prairie, Adyant Enersol and ReNew win NTPC’s 1.2 GW Wind-Solar Auction
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PGCIL secures LoIs for two ISTS schemes in Rajasthan
By October 24, 2024October 24, 2024

Power Grid Corporation of India Ltd (PGCIL) has received letters of intent (LoIs) for two interstate transmission system (ISTS) schemes for evacuating renewable energy from Rajasthan’s Renewable Energy Zone (REZ) Phase IV (6 GW) [Bikaner complex]. The LoIs were issued on October 21, 2024, with PGCIL confirming the notifications on October 22, 2024. The two schemes are: Transmission system for evacuation of power from Rajasthan REZ Phase IV (Part-3: 6 GW) [Bikaner complex]: Part A-…

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Sembcorp Industries secures wind-solar hybrid project from SECI
By October 18, 2024October 18, 2024

Sembcorp Industries, through its subsidiary Sembcorp Green Infra, has won a 150 MW wind-solar hybrid project from the Solar Energy Corporation of India (SECI). The project, connected to the interstate transmission system (ISTS), is part of SECI’s 600 MW bid. Sembcorp has received the letter of award (LoA) for this build-own-operate (BOO) initiative. The power generated will be sold to SECI under a 25-year power purchase agreement (PPA). The project is expected to achieve commercial…

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SPV incorporated for Bhadla-Bikaner complex ISTS scheme
By October 17, 2024October 17, 2024

PFC Consulting Ltd (PFCCL) has formed a wholly-owned subsidiary, “Bikaner and Bhadla Transmission Complex Ltd,” to serve as the special purpose vehicle (SPV) for the project “Transmission system strengthening to facilitate evacuation of power from Bhadla/Bikaner Complex” aimed at evacuating renewable energy from Rajasthan to load centres in Delhi and Uttar Pradesh. The project, incorporated on October 15, 2024, is part of an ISTS scheme. PFCCL is overseeing the bidder selection process through a tariff-based…

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