Concept:Natural gas based power projects are thermal power plants that use natural gas as fuel to generate electricity. In Rajasthan, the Ramgarh Gas Thermal Power Plant is a key example.Explanation:Ramgarh gas thermal power plant is located near Ramgarh village, about 60 km from Jaisalmer in Rajasthan. Its first unit of 3 MW is no longer operational. The present installed capacity is 270.50 MW. This plant is a natural gas based power project. The other options—Dholpur, Bhiwadi, and Jalippa—are not gas based power projects in this context. Therefore, the correct choice is Ramgarh.Answer:Ramgarh (Option A)