Refer to the passage below and then answer the question afterwards in the same language as the passage:

Passage: On the day of the collapse, Power Minister Sushilkumar Shinde ordered a three-member panel to determine the reason for the failure and report on it in fifteen days. In response to criticism, he observed that India was not alone in suffering major power outages, as blackouts had also occurred in the United States and Brazil within the previous few years.The Washington Post described the failure as adding urgency to Indian Prime Minister Dr. Manmohan Singh's plan for a US$400 billion overhaul of India's power grid. His plan calls for a further 76 gigawatts of generation by 2017, produced in part by nuclear power.

Question: What is the major part of Prime Minister Dr. Manmohan Singh's plan for overhauling India's power grid?
nuclear power