Power Grid Corporation of India Ltd
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History
Anilesh S. Mahajan “India Today” 21/8/2017
In October 1989, even as the country was in political turmoil, the then V.P. Singh government decided to move on the plan to merge transmission assets of nine central sector generation companies along with the regional dispatch centres managed by watchdog Central Electricity Authority (CEA) to form the National Power Transmission Corporation Limited (NPTCL), later rechristened the Power Grid Corporation of India Ltd. This move led to a more synergised approach, allowing the transmission of electricity from one region to another. In 2016-17, the grid had a capacity to transfer 75,000 MW electricity. In the last fiscal, half of the 1,200 billion units generated in the country flowed through its network.
The 19th CEA electricity survey projected that electricity demand in the country would be 235 GW by 2022. The country today already has installed capacity of 330 GW with peak demand of 160 GW. This means Power Grid has the liberty today to focus more on strengthening the system than on new projects. A major task is a 'green corridor' to accommodate 175 GW of renewable energy by 2022.
High-voltage transmission technology
India among Top 6 countries
The Times of India, Aug 08 2016
Sanjay Dutta
PowerGrid beats global peers in high-voltage game
India's PowerGrid and a clutch of 35 domestic electrical equipment manufacturers have jointly developed a system for transmitting bulk power with a force of 1,200kV (kilovolts), beating members of an exclusive club of six economies in the high-voltage transmission technology game.
To put things in perspective, the new system's transmission force is 5,454 times more than that of domestic power supply and 48 times more than the voltage -25kV , or 25,000 volts -at which electricity is supplied to locomotives through overhead wires.
Ratings of 1,000kV and above qualify as `ultra-high voltage (UHV)' and UHVAC (ultra-high voltage alternate current) systems allow more power to be pushed through a line to make more efficient use of infrastructure and re duce costs. Globally , most of the transmission networks are rated at 400-800kV , described as `high voltage'.
“Our UHVAC system is completely `made in India'.Its carrying capacity is 6,000MW per circuit (line).This is equivalent to 10-12 circuits of 400kV or 2-3 circuits of 800kV AC lines. Adoption of 1,200kV transmission system with nominal voltage of 1,150kV allows 20% to 30% additional capacity compared to nominal voltage of 1,000kV adopted by other countries,“ PowerGrid chairman Indu Shekhar Jha told TOI.
Two lines connecting PowerGrid's national UHVAC testing station between Bina in MP and Wardha in Maharashtra have been reconfigured to 1,200kV rating using equipment manufactured by Bhel, CGL and Indian arms of ABB, Toshiba, Siemens and Crompton Greaves, among others. The first commercial UHVAC line is coming up between Satna and Wardha, covering a distance of 400km.
“The testing station will give confidence to more Indian equipment manufacturers to get into the UHVAC segment, creating a domestic ecosystem. Indian industry is now in the elite club of UHVAC equipment manufacturers owing to this test station,“ Jha said.
The testing station has drawn the attention of utilities across the world who are seeking inputs to develop international standards for UHVAC transmission systems.
Transmission bottleneck has long been considered the Achilles' heel of India's power sector. As TOIreported earlier, more than 3 billion units of power -roughly a day's national consumption -were lost in 2014-15 due to congestion in the transmission system. The figure has since come down drastically as PowerGrid has switched on several new lines.
