The “Interim ISTS Rolling Plan 2029-30,” released by Central Transmission Utility of India Ltd (CTUIL), outlines plans to build a 19,500 MW interstate transmission system (ISTS) network to supply renewable energy to upcoming green hydrogen plants by FY30. The entire 19,500 MW is expected to come online by FY28, benefiting green hydrogen and ammonia manufacturing plants in Gujarat, Tamil Nadu, and Andhra Pradesh.
This transmission infrastructure, estimated to cost Rs 15.63 billion, will be implemented through five ISTS schemes. Gujarat will receive the largest share with 13,500 MW, while Andhra Pradesh and Tamil Nadu will each get 3,000 MW.
Three of these schemes, approved by the National Committee on Transmission (NCT) with a budget of Rs 8.2 billion, will serve green hydrogen/ammonia plants in Gujarat and Tamil Nadu. They include:
- Power supply to Kandla’s green hydrogen/ammonia potential (3 GW)
- Mundra area’s power supply (3 GW at Navinal substation)
- Tuticorin’s green hydrogen/ammonia projects (3 GW)
The remaining two schemes, serving 7,500 MW in Mundra and 3,000 MW in Kakinada, Andhra Pradesh, are expected by FY28 but are yet to be approved by the NCT.
The CTUIL report emphasises the need for long-term renewable energy infrastructure, estimating a 125 GW demand from green hydrogen/ammonia producers. From FY26 to FY30, the ISTS network will integrate 66,274 MW of renewable and conventional energy, with 19,500 MW dedicated to green hydrogen plants.