The Central Electricity Authority (CEA) has released the updated Manual on Transmission Planning Criteria, 2026, to address the changing requirements of India’s power sector. The revised framework aims to strengthen the country’s transmission infrastructure amid rising electricity demand, increasing renewable energy integration, and growing requirements for long-distance electricity transmission. It establishes technical guidelines for developing a reliable, resilient, and efficient national power grid capable of supporting India’s evolving energy needs.
The updated manual reflects the significant transformation of India’s electricity network since the introduction of the initial transmission planning guidelines in 1985. Over the decades, the country has moved from a system based largely on regional self-sufficiency to a unified synchronous national grid. This development has increased the need for coordinated transmission planning, efficient power transfers between regions, and stronger infrastructure to accommodate changing patterns of electricity generation and consumption.
One of the significant provisions in the 2026 manual is the inclusion of planning criteria for 1150 kV Ultra High Voltage Alternating Current (UHVAC) transmission systems. These systems are intended to support the development of high-capacity transmission corridors and help address constraints associated with Right-of-Way (RoW) requirements. Efficient use of available land and transmission corridors has become increasingly important as electricity demand rises and large renewable energy projects are developed across different parts of the country.
The updated framework also incorporates standard system models and technical parameters for emerging power technologies. These include Voltage Source Converter-based High Voltage Direct Current (VSC-HVDC) systems, wind farms, solar power plants, Battery Energy Storage Systems (BESS), and Static Synchronous Compensators (STATCOMs). The inclusion of these technologies is intended to improve the accuracy and consistency of technical studies and support the planning of transmission networks capable of accommodating a more diverse electricity generation mix.
The manual provides detailed planning philosophies and procedures for both Inter-State Transmission Systems (ISTS) and Intra-State Transmission Systems (Intra-STS). It emphasizes the importance of coordinated planning among the agencies responsible for developing, operating, and maintaining transmission infrastructure. The framework also encourages planners to use the PM GatiShakti National Master Plan portal during transmission route selection to identify suitable corridors, avoid protected areas, and reduce environmental impacts associated with infrastructure development.
Technical assessments form a central part of the updated planning criteria. Transmission planners are required to undertake studies covering load flow, short circuit levels, system stability, and Total Transfer Capability (TTC). These assessments must consider different combinations of electricity demand and generation, including scenarios involving high renewable energy penetration and seasonal variations in consumption.
The revised framework also incorporates explicit planning margins to account for uncertainties in electricity demand, generation availability, and system operating conditions. These provisions are intended to ensure that transmission networks remain within prescribed voltage limits and line thermal loading thresholds under different operating scenarios. By accounting for potential variations in system conditions, planners can improve network reliability and reduce the risk of operational constraints.
The manual further emphasizes the importance of contingency planning to maintain grid security during equipment outages and other disruptions. It includes criteria covering N-1 and N-1-1 contingencies, requiring planners to assess system performance following specified equipment failures. These assessments are intended to help identify network weaknesses and ensure that the grid can withstand defined disturbances without compromising overall system stability.
The CEA’s updated framework also highlights the need to balance investment costs, operational risks, and reliability requirements when developing transmission infrastructure. Effective implementation will require coordination among the CEA, Central Transmission Utility of India Limited (CTUIL), State Transmission Utilities (STUs), and grid operators. Structured implementation timelines and the use of advanced simulation tools are expected to support more efficient project planning and execution.
With the release of the 2026 manual, India’s transmission planning framework is positioned to address the technical challenges associated with a rapidly expanding electricity network. The guidelines provide utilities and regulators with a common reference for planning future transmission capacity, improving resource utilization, reducing network congestion, and supporting the integration of renewable energy. The framework is intended to help ensure that transmission infrastructure keeps pace with the country’s long-term electricity requirements and broader transition towards a sustainable energy system.
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