'Where are the hydroelectric power plants in India located?' will be a grammatically correct question, not 'where is'.
thermal power plants are located in Orissa and Kerala.
Only India has nuclear power reactors with thorium in operation: Kaiga, Rajasthan, Kaprakar. Bravo Indians, all before !
list of power plant addresses and concern person details in India
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power plants
For nuclear plants, see the link below
Do you mean nuclear plants? See link below
ntpc
See link below
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Yes, see the India section of www.world-nuclear.org