In August, the Atomic Energy Regulatory Board (AERB) gave its nod to KNPP to raise the reactor power levels to 50 percent and synchronisation of the unit with the power grid.
The NPCIL earlier said it would connect the first unit to the grid end-August, generating 400 MW power.
But that did not happen due to two condenser valve problems which seemed to have got stuck.
According to officials the power generation will be increased gradually.
