I heard Dadra Nagar Haveli has lowest electricity price. around 2Rs./Unit
I don't know the rest of the factor you have enlisted.
You are partially right , Diu Daman and Dadra nagar haveli is Union territory.
For industrial power, it's around 3.4 Rupees/Unit also intensive available if you use according to your sanction limit
Whoever is reporting 2 rupees is applicable for initial 200 units than normal unit price is around 4 -4.5 INR.