This expansion requires approximately 191,000 circuit-kilometres of additional transmission lines and a near-doubling of transformation capacity to around 2,342–2,345 GVA by 2032, as outlined in National Electricity Plan Volume II (Transmission) figures referenced by the Global Trade Research Initiative (GTRI) and confirmed in parliamentary updates and PIB releases. Much of the new network will rely on lattice towers and substation frames fabricated from structural steels such as IS 2062 E250 or E350 grades. These members are typically hot-dip galvanised to coating weights of 900 g/m² or higher (often corresponding to 80–120 µm or more under IS 4759 / ISO 1461 practices) to withstand outdoor exposure.
The most demanding conditions occur along the humid coastal corridors of Gujarat and Tamil Nadu, and in other high-chloride or high-humidity zones. Atmospheric corrosion rates rise sharply in these C4–C5 environments because of prolonged time-of-wetness, salt aerosols and elevated temperatures. Field observations and Indian studies on coastal transmission assets show that inadequate zinc thickness leads to early coating depletion, leg-section loss and accelerated maintenance cycles. Proper galvanised structural steel with controlled coating mass and metallurgical bonding provides both barrier and sacrificial protection, extending service life under precisely these conditions.
Transformer cores add another layer of demand. CRGO electrical-steel consumption has been estimated at 400,000–450,000 tonnes annually in recent GTRI and industry assessments, while domestic output remains in the 40,000–50,000-tonne range (primarily from the JSW–JFE Nashik facility, with further expansions planned at Nashik and Vijayanagar toward a combined capacity of around 350,000 tonnes in the later 2020s). Roughly 90 percent of requirements continue to be met by imports from China, Japan, Korea and Russia, a dependence confirmed by BigMint trade monitors and the 2026 anti-dumping investigation notes. Any sustained duty increase would raise transformer costs at the moment 765 kV AC and ±800 kV HVDC corridors are prioritised for evacuating solar and wind from Rajasthan and the western desert regions.
Structural steel for towers and substation frames receives less public attention yet forms a steady component of infrastructure offtake under the National Steel Policy framework. Worldsteel short-range outlooks have repeatedly identified India as the fastest-growing major steel market in the mid-2020s, driven in part by these grid programmes. Official CEA capacity additions, PGCIL capital-expenditure disclosures and private trade data converge on the same picture: the build-out is a multi-year claim on both commodity structural steel and specialty electrical steel, concentrated in the very geographies where renewable capacity and climatic stress are rising fastest.
For project developers and EPC contractors operating in high-temperature, high-humidity outdoor environments, the practical requirement is consistent supply of corrosion-resistant galvanised steel that meets coating-thickness, adhesion and mechanical specifications for transmission towers. Reliable bulk deliveries of such material support stable long-term operation of the expanded grid and reduce lifecycle maintenance risk.
Contact us to discuss specifications, coating options and delivery schedules tailored to Indian transmission projects.
