Clarification needed about central excise

Dear all,

I need your kind help to understand a case study. A quick brief about the case study is: 

"Gramin Power Corporation Ltd. is engaged in the activity of generation and distribution of electricity in the rural area of the state of Maharashtra. The central excise officer demanded notice for generation and distribution of electricity. The assessee contended that before levy of excise duty, electricity must fall under the definition of goods i.e. movable (or tangible) and marketable. Advice whose contention is correct."

Here in this, my question is:

1. is electricity generated and distributed by this company movable ? 

2. is electricity generated and distributed by this company marketable ?

3. does this company needs to pay excise duty for the electricity generated and distributed by them ?

Request you all to kindly help me understand the case study better.

Thanks and Regards