The correct answer is: A. Yamunanagar Power Plant
The Yamunanagar Power Plant is a coal-fired power plant located in Yamunanagar district of Haryana, India. It is the largest power plant in Haryana with an installed capacity of 1,980 MW. The plant was commissioned in 1985 and is owned and operated by NTPC Limited.
The Panipat Power Plant is a gas-fired power plant located in Panipat district of Haryana, India. It has an installed capacity of 1,320 MW and was commissioned in 2001. The plant is owned and operated by GAIL (India) Limited.
The Rajiv Gandhi Power Plant is a combined cycle power plant located in Jhajjar district of Haryana, India. It has an installed capacity of 1,200 MW and was commissioned in 2007. The plant is owned and operated by Haryana Power Generation Corporation Limited.
The WYC Hydel Power Plant is a hydroelectric power plant located in Yamunanagar district of Haryana, India. It has an installed capacity of 100 MW and was commissioned in 1992. The plant is owned and operated by the Haryana State Electricity Board.
The Yamunanagar Power Plant is the largest power plant in Haryana because it has the highest installed capacity. The Panipat Power Plant is the second largest power plant in Haryana, followed by the Rajiv Gandhi Power Plant and the WYC Hydel Power Plant.