Patel Engineering NSE -0.91 % on Tuesday said it has won an order worth Rs 1,564.42 crore to build 2,000 MW Subansiri Lower Hydro Electric project in Arunachal Pradesh. This will be the single largest hydro power generation project in India, the company said in a statement. The project is located at village Kolaptukar in Kamle (formerly lower Subansiri) district of Arunachal Pradesh.