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Detailed vision of 2012 related to transmission sector

The Investments in and growth of Transmission, sub-Transmission and Distribution Systems have not matched the increase in generating capacity. Consequently, there are constraints of power evacuation from generating sations. The problem is severe in the eastern region, where surplus capacity is idling due to lack of absorption network and evacuation facilities. The power sector development demands a thrust on Transmission sector and the following blueprint is envisaged for the sector.

Formation of National Grid
Before the beginning of the planning era in 1951, the electricity supply industry in the country consisted of generating stations supplying power to loads in their immediate vicinity. With a view to promote reliability of power supply and achieving operating economies, interconnections of individuals systems was down leading first to the formation of State grids. The uneven geographical distributon of exploitable energy resources (coal and hydro potential in the country) necessitated large scale transportation of coal across the State boundaris. A decision was taken in the early sixties to create regional electricity grids as basic units for power planning and operations of the electric power system. In the seventies, the regional grids were in position and advantages of sharing generating capacity between the State, and the inter-connected operation were being obtained. In the eighties, with the commissioning of the Regional power stations by Central sector Generating Companies (NTPC, NHPC) and construction of EHV transmission lines by them transcending state boundaries, the development of regional grids was further accelerated. This has necessitated the formation of a National Power Grid to fulfill the following objectives:

• Enable transfer to power from power surplus regions to deficit regions
• Enable optimal development and utilisation of coal and hydro resources, in the overall interest of the nation.
• Improve economy, reliability and quality of power supply.

Towards the objective of formation of National Grid, a number of inter-regional schemes have been planned for phased development. The brief status including interregional links under operation, approved schemes and future programme is presented ahead:

With the help of the above links, transfer of power among the regions, especially from the power surplus Eastern Region, has enhanced significantly, as can be seen from the chart below:

Inter-regional links under Operation


Energy Transferred Among Regions (Million Units)


New Approved Schemes
In order to further strengthen the interconnection between regions, some more schemes have been approved which are under different stages of implementation and are expected to be commissioned by 2003.

Additional inter-regional Schemes by 2003

Name of the link	Regions Interconnected	Capacity (MW)
Talcher-Kolar HVDC bipole	East and South	2000
Rourkela-Raipur 400kV D/c	East and West	1000
Total		3000

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