India’s power transmission sector is undergoing a structural shift. For decades, the conversation has centred on scale: more towers, more kilometres, more capacity. The grid is being asked to carry higher voltages across more challenging terrain, integrate an increasingly variable renewable energy mix, and do so with structures that must be lighter, stronger, and engineered to exacting tolerances.
India’s national grid is progressively moving towards Extra High Voltage (EHV) and Ultra High Voltage (UHV) transmission corridors, where 765 kV lines are no longer an exception, and 1200 kV is already part of the planning horizon. This voltage escalation is not just a technical upgrade; it fundamentally changes the structural engineering calculus. Towers must support heavier conductors, such as HTLS (High Temperature Low Sag) variants, over longer spans while managing greater mechanical loads.
At these parameters, even minor deviations in fabrication or galvanisation quality can have cascading consequences on structural integrity. This has prompted a rethinking of design standards across the industry. For engineering teams, the challenge is not just producing towers and monopoles that meet load requirements under ideal conditions,but ensuring reliable performance under real-world conditions.
Engineering Lighter, Yet Stronger Structures
One of the more counterintuitive trends in transmission tower design is making structures lighter while also increasing their load-bearing capacity. The Ministry of Power’s 2024 Right of Way (RoW) schedule does not treat RoW as a single number. It ties RoW width to voltage level, tower configuration, conductor type, design span, and stringing method. In the published schedule, RoW widths for 765 kV vary materially by configuration and by terrain category (normal route, forest, and urban/populated approach sections). It also explicitly includes ±500 kV and ±800 kV HVDC corridor entries. RoW, therefore, is not only a legal or social constraint; it is an engineering input. This is why transmission engineering is evolving from “bigger towers” to structural optimisation.
This weight reduction has downstream benefits: it reduces foundation load requirements, lowers erection complexity, and can meaningfully cut project costs — particularly in difficult terrains. The 2024 RoW guideline explicitly points implementers to alternatives such as monopoles, narrow-based lattice towers, multi-circuit and multi-voltage towers, compact towers with insulated cross arms, underground XLPE cables, gas-insulated lines, and VSC-based HVDC systems. Each option changes not just the electrical solution, but also the fabrication complexity, packing and logistics plan, erection philosophy, and construction cycle time.
The Manufacturing Imperative
The technical demands now being placed on India’s transmission sector cannot be met without a corresponding evolution in domestic manufacturing capability. For structure manufacturers, the implication is clear. The first is material discipline and repeatability. MoP-hosted transmission RFP specifications explicitly allow steel sections of grade E 250 and/or E 350 (as per IS 2062) for towers and related steelwork, reflecting the need for consistent mechanical properties at scale.
The second is durability-by-design. The same RFP tightens corrosion requirements for cyclone-prone, coastal, and aggressive-soil regions, including elevated minimum zinc coating requirements (for example, 900 g/m² in such conditions), alongside foundation corrosion mitigation measures. This is where manufacturing excellence becomes grid resilience.
Precision engineering is not an abstract aspiration. Companies are upgrading fabrication and CNC capabilities. Prototype testing, including full-scale tower destruction tests, is also becoming standard practice for major projects, ensuring that designs validated on paper perform as expected under real-world loading conditions.
The EPC Revolution
EPC execution is changing just as fast. India’s renewable energy generation is often concentrated in geographically remote areas. Connecting these zones to the national grid requires transmission lines that traverse difficult, often ecologically sensitive terrain, where standard tower designs and conventional erection methods are not always viable. RoW and local acceptance are now schedule-critical constraints even for high-voltage interstate lines.
The 2024 RoW guideline establishes tower base compensation at 200% of land value and corridor compensation at 30% of land value. The 2025 supplementary guideline recognises market-rate disputes and provides modalities such as a committee-based market-rate determination process and differentiated RoW compensation rates by area type.
Precision also means being terrain-aware and technology-enabled. MoP-hosted RFP provisions describe when pile foundations should be deployed in river or creek beds and require design to be informed by soil investigation, flood levels, scour depth, and multi-year river morphology data. It also enables tools that reduce field risk, such as centralised remote monitoring and operation of substations via SCADA, and the use of Unmanned Aerial Vehicles for the construction and inspection of transmission assets in difficult and inaccessible terrain.
Planning for Future Requirements Today
India’s renewable energy programme targets 500 GW of non-fossil fuel capacity by 2030, and places the transmission grid at the centre of the energy transition. The variability inherent in solar and wind generation creates dynamic load conditions that transmission infrastructure must be designed to handle.
This has accelerated interest in upgradeable tower designs, mainly structures engineered with sufficient reserve capacity to accommodate reconductoring with higher-capacity lines at a later stage. Structures along evacuation corridors must be capable of accommodating planned future capacity additions without requiring wholesale replacement.
This has driven demand for towers designed to support HTLS conductors, which can carry significantly more power than conventional ACSR conductors on the same tower structures, offering a cost-effective path to increasing line capacity in congested corridors without full replacement.
For India’s transmission ecosystem, and for organisations like Salasar that sit within the structure manufacturing and EPC value chain, the next decade will reward those who treat every corridor as a constrained system and every tower as a manufactured product with engineered performance. The grid is still scaling, but it is scaling into constraints. That is why the sector is moving from scale to precision: the only sustainable way to carry more power, through less space, with higher reliability.
For engineers, manufacturers, and planners working in this space, the message is clear: the next chapter of India’s grid story will be written not just in kilometres of line commissioned, but in the flexibility, resilience, and intelligence of the structures that carry it. That is where the real opportunity lies.
