Transmission Infrastructure

Why is it in the News?

India's rapid expansion of solar and wind energy has exposed serious transmission infrastructure bottlenecks, making grid modernisation a critical priority for achieving the country's clean energy targets.

Introduction

India has emerged as one of the world's fastest-growing renewable energy (RE) markets, with solar and wind power becoming the cheapest sources of electricity. However, while renewable power plants can be commissioned within months, transmission infrastructure takes several years to develop due to land acquisition, environmental clearances and regulatory approvals. Consequently, the country's clean energy transition is now constrained not by generation capacity but by the ability to transmit electricity efficiently.

India's Renewable Energy Expansion and Rising Demand

Rapid Growth of Renewable Energy Capacity

India currently possesses nearly 250 GW of renewable energy capacity, with another 100 GW under construction. As transport, industry and households become increasingly electrified, India's electricity demand is projected to rise sharply, requiring nearly 2,000 GW of renewable energy capacity by 2050. Achieving this ambitious target will require one of the largest energy infrastructure expansions in the world.

Transmission Development Lagging Behind

Although renewable generation capacity is expanding rapidly, over 50 GW of clean energy capacity remains unable to connect effectively to the national grid because transmission infrastructure has failed to keep pace. Building new transmission corridors involves lengthy processes such as land acquisition, forest and environmental clearances, regulatory approvals, and construction, making transmission the biggest bottleneck in India's energy transition.

Transmission Infrastructure: The New Bottleneck

Mismatch Between Generation and Transmission

Renewable energy projects can become operational within a short period, whereas transmission lines require several years to complete. This mismatch leads to grid congestion, underutilisation of renewable assets, and delays in integrating new power projects.

Challenges in Developing New Transmission Corridors

The construction of transmission networks faces multiple obstacles including high capital costs, acquisition of land, environmental concerns, local opposition, and lengthy approval procedures. These factors significantly delay the evacuation of renewable power from generation centres to consumption hubs.

Optimising Existing Transmission Infrastructure

Battery Energy Storage Systems (BESS)

One of the most effective solutions to improve transmission efficiency is the integration of Battery Energy Storage Systems (BESS). Renewable projects generally utilise transmission lines only when electricity is generated. Batteries store surplus electricity during periods of high generation and release it during peak demand, thereby improving transmission utilisation.

This strategy has the potential to unlock nearly 400 GW of additional renewable energy capacity without constructing new transmission corridors.

Utilising Existing Coal Transmission Corridors

Many ageing coal-fired power plants operate below their installed capacity but continue to possess valuable transmission infrastructure. Locating renewable energy projects near such plants allows clean electricity to utilise existing transmission lines whenever coal generation declines.

This approach improves utilisation of existing assets, reduces transmission congestion and can support nearly 100 GW of additional renewable energy capacity.

Leveraging Existing Substations

Several existing electricity substations possess spare capacity that can accommodate additional renewable energy connections with minimal upgrades. When integrated with battery storage systems, these substations can efficiently manage power flows and facilitate another 100 GW of clean energy generation.

Role of Advanced Transmission Technologies

Reconductoring Existing Transmission Lines

A significant portion of India's transmission network still relies on conventional conductors that experience reduced efficiency at higher temperatures.

Replacing them with High-Temperature Low-Sag (HTLS) Conductors through reconductoring can nearly double transmission capacity while using the same towers and transmission corridors.

This approach offers several advantages:

• Avoids fresh land acquisition

• Reduces project costs

• Enhances grid efficiency

• Minimises environmental impacts

Creating Clean Energy Superhighways

The combination of advanced conductors, battery storage, and shared transmission infrastructure can transform the existing grid into Clean Energy Superhighways, capable of supporting more than 1,000 GW of additional renewable energy without extensive new transmission construction.

Economic and Industrial Significance

Enhancing Energy Security and Industrial Competitiveness

A modern and efficient transmission network provides reliable, affordable and uninterrupted electricity, which is essential for energy-intensive industries such as:

• Steel

• Aluminium

• Cement

• Chemicals

• Data Centres

Improved grid efficiency also strengthens India's energy security, reduces dependence on fossil fuels and lowers electricity costs.

Maximising Infrastructure Investments

India plans to invest over $100 billion in transmission infrastructure while expanding its transmission network by nearly 40% during the coming decade.

Integrating advanced technologies into these investments will maximise long-term returns, improve asset utilisation and reduce future congestion.

Need for Policy Reforms

Promoting Storage-Integrated Renewable Energy

Regulatory policies should actively encourage the integration of Battery Energy Storage Systems with renewable projects. Storage enables efficient utilisation of transmission infrastructure and enhances grid stability.

Encouraging Advanced Transmission Technologies

Government procurement policies should promote High-Temperature Low-Sag conductors, dynamic line rating, and other advanced transmission technologies that provide higher capacity and greater operational efficiency despite slightly higher initial costs.

Integrated Planning through Renewable Energy Zones

The development of Renewable Energy Zones (REZs) alongside optimised transmission corridors should be prioritised to minimise planning delays and ensure efficient evacuation of renewable power.

Integrated planning between generation and transmission infrastructure will reduce project delays and improve overall system efficiency.

Government Initiatives Supporting Grid Modernisation

India has undertaken several initiatives to strengthen its transmission network and facilitate renewable energy integration.

Green Energy Corridor (GEC) Programme

The programme aims to establish dedicated transmission infrastructure for evacuating renewable energy from resource-rich states to major consumption centres.

National Green Hydrogen Mission

The expansion of transmission infrastructure complements the mission by enabling greater renewable energy generation required for producing green hydrogen.

PM Gati Shakti National Master Plan

The initiative promotes integrated infrastructure planning across sectors, including energy transmission, thereby reducing project delays and improving coordination.

National Electricity Plan (Transmission)

Prepared by the Central Electricity Authority (CEA), the plan provides a long-term roadmap for expanding India's interstate transmission system in line with future electricity demand.

Challenges Ahead

Despite significant opportunities, several challenges remain.

High capital investment requirements, slow project execution, environmental clearances, land acquisition issues, cyber-security concerns associated with smart grids, and the intermittent nature of renewable energy continue to affect transmission planning and implementation.

Furthermore, coordination between Central Transmission Utility (CTU), State Transmission Utilities (STUs) and distribution companies remains crucial for efficient grid expansion.

Way Forward

India must shift from merely expanding renewable generation to building a smarter and more resilient electricity grid. Greater integration of battery storage, utilisation of existing transmission assets, deployment of advanced conductor technologies, and comprehensive policy reforms will significantly enhance transmission efficiency.

Planning renewable generation and transmission infrastructure simultaneously, encouraging public-private investment, and accelerating approvals through digital governance will enable India to achieve its long-term renewable energy ambitions.

Conclusion

India's clean energy transition depends not only on producing renewable electricity but also on delivering it efficiently. Transmission infrastructure has become the most critical determinant of future renewable energy growth. Through grid modernisation, battery storage integration, advanced transmission technologies, and forward-looking policy reforms, India can unlock vast renewable energy potential while strengthening energy security, industrial competitiveness, and sustainable economic development.