Neyveli region received a rainfall of around 408mm in 8 hours on November 9, 2015, the highest since the inception of the company in 1956.
There has been almost persistent rain since November 8, resulting in flooding of mines and suspension of mining operations and lower power generation, NLC said in a filing to the BSE today.
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"However, maximum possible power generation has been taken up. Necessary action has been taken to make up for the shortfall in production and power generation to the extent possible", it said.
The power generation in thermal power station in Barsingsar, Rajasthan and in Tuticorin power project of NLC Tamil Nadu Power Ltd are operating as usual, it said.