Besides renovation and modernisation, the rated output of the thermal unit has been enhanced to 216 MW. The work has been carried out at Obra thermal power station, an Uttar Pradesh government enterprise.
In a statement, BHEL said the working life of the machine has also been extended by another 15-20 years.
"This is also the first instance of a successful modernisation and uprating of any 200 MW class machine in India," it added.
State-run BHEL is a leading power equipment maker in the country.