"Tata Power said that a technical snag developed in Unit 7 at Trombay thermal power generating station," the company said in a regulatory filing to the stock exchange.
The gas turbine generator rotor of the Combined Cycle Gas based unit developed an inter-turn short and ground.
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However, there is no associated damage to any other equipment, the company said without disclosing whether or not power generation was impacted due to the snag.
It said the exact extent of the fault and the repair required would be known once the rotor end rings are dismantled and fault or damage is closely examined.
The plant has a total power generation capacity of 1,580 MW.