This question requires knowledge of India's power generation sources and their installed capacity percentages as of a specific date (September 30, 2016). The Central Electricity Authority (CEA) and Ministry of Power are primary sources for this data. Hydro (Large Hydro): ~14.1% - Natural Gas: ing order by percentage is Hydro, Natural Gas, Nuclear, Diesel. This corresponds to the order of the numbers: 1, 2, 3, 4.