With the completion of the green corridor, PGCIL will take up the challenge to erect and use the grid network, especially for renewable resources.
Power Grid Corporation of India has planned a capital investment of Rs 100,000 crore for development of an inter-State transmission system during the 12th Five Year Plan. The company has been assigned a corporate rating of "BBB" by international credit ratings agencies, Standard & Poor's and Fitch Ratings.
PGCIL presently owns and operates a transmission network of about 107,500 ckm of transmission lines and 185 EHVAC and HVDC substations having transformation capacity of more than 206,000 MVA with an availability of its transmission network more than 99 per cent, and it wheels about 50 per cent of total power generated in the country. The company is also taking adequate measures for strengthening the inter-State and inter-regional links for enhancing the capacity of the national grid. At present, a national grid with inter-regional power transfer capacity of about 38,550 MW has been established. Now, with the commissioning of the Raichur-Solapur 765 kV single circuit transmission line by PGCIL on 31 December 2013, the Southern grid was synchronously interconnected with the rest of the national power grid, accomplishing the goal of "One Nation-One Grid-One Frequency."
The green corridor
It's an ambitious plan for the country with an investment of over Rs 43,000 crore. PGCIL is currently working on the initial plan of the project and expects that work would commence in the 12th Five-Year Plan. The idea is to erect and use the grid network, especially for renewable resources. It is required because the supply of power from renewable resources like wind and solar keeps on fluctuating. The grid will be synchronised with the main grid, which can use the power as per the requirement.
Being the nodal agency for grant of Long Term Access (LTA) to power producers, Power Grid has undertaken development of high capacity transmission corridors for evacuation of a large quantum of power from various Independent Power Producers (IPPs) mainly coming up in resource rich States. This power is required to be transmitted to load centres located across the States and regions.
Accordingly, implementation of 11 high capacity power transmission corridors (HCPTCs) has been planned by the company in consultation with CEA, IPPs and beneficiaries. CERC has already granted regulatory approval for 11 HCPTCs at an estimated cost of Rs 75,000 crore. Implementation of these corridors is being taken up in a phased manner matching the progress of generation projects. This will go a long way in integrated development of the transmission system in the country.
For FY14, the company's turnover and net profit was Rs 115,721 crore and Rs 4,497 crore respectively. As on 31 March 2014, total fixed assets were Rs 96,504 crore.
Power Grid has the experience of constructing 765kV UHVAC and +-500kV HVDC transmission system. The company is now working on next higher transmission voltages of +-800kV HVDC and 1,200kV UHVAC system to achieve efficient utilisation of RoW and increased power transfer capability for transfer of bulk power over long distances. The company is currently establishing two +-800kV, 6,000 MW HVDC bi-pole lines: one from the northeastern region to the northern region and the other from the western region to the northern region.
The 1200 Kv (the world's highest voltage) UHVAC technology is being developed by the company with participation from indigenous manufacturers of equipment, and towards this direction, the 1200 kV test lines are charged at 1200 kV National Test Station Bina, Madhya Pradesh, and field tests are under progress.