The company produced 10,513 million units in first nine months of 2013-14 (April-December), according to a statement.
Tata Power, its subsidiaries and jointly controlled entities have a combined installed generation capacity of 8,560 MW, including thermal, hydro, wind and solar, it said.
The company said subsidiaries Maithon Power Ltd and Coastal Gujarat Power Ltd contributed significantly after achieving full operations.
Maithon Power operates a 1,050 MW plant and Coastal Gujarat runs a 4,000 MW project.
Tata Power has installed generation capacity of 1,102 MW through clean and green energy sources.
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Tata Power is developing the 126 MW Dagachhu hydro power project in partnership with Bhutan.
"The civil works are progressing as planned and 99 per cent concreting has been completed. Tunnel excavation and tunnel lining is in progress. The project is being pursued to be commissioned around May 2014, before monsoon," the statement said.
One unit of electricity is equivalent to one kilowatt hour or the amount of energy consumed by an electrical device that is rated at 1,000 watts for one hour.