Sundar said the first unit has been shutdown for annual maintenance, which is about to be completed.
The power generation in KNPP's second unit is to be met on top priority this financial year, he said.
India's atomic power plant operator Nuclear Power Corporation of India Ltd. (NPCIL) will set up two 1,000 mw Russian reactors at Kudankulam in Tirunelveli district, 650 km from here. The total outlay for the project is over Rs.17,000 crore.
The KNPP is India's first pressurised water reactor belonging to the light water reactor category.
The first unit attained criticality in July 2013, which is the beginning of the fission process.