The DERC had issued the order following directions from the city government in this regard. The discom said the Delhi government's orders are not binding on the power regulator.
The Delhi High Court had recently quashed the directions of the government where prior approval of the LG was not taken before issuing them.
However, a senior government official said the High Court verdict will have no effect on the notification issued by the DERC, which Tata discom TPDDL has challenged.
In its petition, Tata Power said the proposals, which include making the discoms liable to pay Rs 100/hour to customers in cases of power cuts exceeding two hours, were not possible to adhere to.