TDS on Power Supply purchase

No deduction

Depend if it is nature of contract
Check agreement if made

It will all depend upon your agreement with the Power generation company. If there is any contractual agreement that they will generate some specific units and provide to you every month then there will be TDS liability u/s 194C otherwise no TDS deduction is required. 

Generally electricity distribution company does not charge gst. But , if the electricity company gives on rental basis then also there are possibilities of charging tax.
The person paying the amount to the electricity distribution company charge tax on service charges raised by the electricity distribution company.

It's purchase of power and fuel. Like diesel, it is supply of electricity. No TDS deduction.

There is no tds on electricity distribution .