Excise on Power sold (Captive Consumption)

Dear

Company A is Producing Taxable Product under Excise and utilizing the Power Generated by them (Captive Consumption)...

Company availing Credit on the Inputs used for Production of Power, as the final product of Company A is Dutiable...

But Company A sale the Excess power to Outsider also the Residential Colony outside the Factory..

So there is liability of 10% of Realisation..

Que is that whether any Deduction allowed from the Realisation such as Electricity Duty..

If Yes what the Condition..