NEW DELHI, May 11 -- State-run NTPC Ltd is considering investing about Rs.56,000 crore to set up 2.8 gigawatt (GW) of nuclear power generation capacity in Bihar through its subsidiary NTPC Parmanu Urja Nigam Ltd, two people aware of the development said. The proposal involves initially setting up two units of 700 megawatts (MW) each, which may later be scaled up with two additional 700 MW units, taking total capacity to 2.8 GW, they said. The required capital expenditure for 1 MW of nuclear power generation capacity is about Rs.20 crore. NTPC is conducting a feasibility study for the proposed site in Banka district of Bihar. "The standard capacity of NTPC's nuclear power plants would be 2x700 MW. However in Bihar, the company would look at expanding the proposed plant's capacity to four units with 700 MW each," said one of the two people mentioned above....