Pervez (30) and Pramod (25) received serious burns when red-hot pieces of burning coal fell on them while they were mixing the fuel in a machine in the Anpara unit, police said.
Both were rushed to the Anpara hospital from where they were referred to Varanasi, they said.
A major tragedy was averted as most of the labourers were working on the other side when the accident took place, they said.
The incident comes just a day after an explosion at NTPC's Unchahar power plant in the Rae Bareli district of Uttar Pradesh claimed atleast 29 lives.