Reliance Power's fourth 660 MW unit of Sasan Ultra Mega Power Project in Madhya Pradesh has commenced electricity generation.
The remaining two units are in advanced stage of construction and will be commissioned in the next few months, it said.
The total power generation capacity of Sasan UMPP is 3,960 MW (6x660 MW).
Coal production has already commenced from the 20 million tonnes Moher and Moher-Amlohri mines associated with the power project.
With this unit, Reliance Power's generation capacity has increased to 4,525 MW that includes 4,440 MW of thermal and 85 MW of renewable energy based capacity.
The first 660 MW unit of the Sasan UMPP was commissioned in March 2013, second in January 2014 and the third one in March 2014.
Shares of the company were trading at Rs 88.45, up 2.97% from its previous close on the BSE.