THDC India Limited ITI Trade Apprentice Jobs. Tehri Hydro Development Corporation India Limited (THDC) has advertised a notification for the recruitment of ITI Trade Apprentice (Draughtsman, Fitter, Electrician, Electronics Mechanic & Other)  Vacancy. Name of the post: SI No Post Name Total 1 Computer Operator & Programming Assistant 30 2 Stenographer/Secretarial Assistant 30 3 Draughtsman