India currently has two transmission systems —Interstate Transmission System (ISTS) and Intra-state Transmission System (Intra-STS). Altogether, these systems make up 305,000ckms of transmission lines(>220kv), 13,500MW of high-voltage direct current (HVDC) terminals, and 591,000MVA of transformation capacity.
India currently has high-capacity transmission systems with 765kV and 400kV AC technology and HVDC systems that deploy up to +/- 800kV technology.The country has about 19,000 circuit km of 765kV lines and ~136,000 circuit km of 400kV lines. The 765kV and 400kV substation capacities are ~126,000MVA and ~193,000MVA respectively. The government will initiate efforts for adopting 1200kV technology (higher-voltage level) in the 13th plan. PGCIL has already set up a test-station at Bina in Madhya Pradesh for a 1200kv AC line and is likely to award orders for two 1200kv lines in the 13th plan. Investment in Flexible AC Transmission System (FACTS), including static VAR compensators (SVCs) and switchable reactors, is also needed to utilize transmission highways and take care of demand variations between peak and off-season.
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