Answer : 2. "Visakhapatnam"
Explanation :

NTPC Green Energy has entered into an agreement with Andhra Pradesh Industrial Infrastructure Corporation to set up India's largest green hydrogen production plant. This plant will be constructed on 1,200 acres of land at Pudimadaka in Achyutapuram mandal in Visakhapatnam, Andhra Pradesh. Under this, the target is to produce 1,200 tonnes of green hydrogen every day.