The 236-metre-long twin towers, located at HEL's 600-MW capacity plant at Haldia and Raichak across the river Hooghly, are the tallest in the country.
Covering a span of 1.5 km, the twin towers weigh 1,800 tonnes.
The world's highest transmission tower (370 metres) is located at Mount Damaoshan in China.
"The power evacuation network is the most sophisticated one. The twin towers are the second tallest ones in the world and the tallest in India. It is something we are very proud of," Sanjiv Goenka, chairman of the RP-Sanjiv Goenka Group, told reporters here today.
Generation of power would begin from next month in the plant.
The tallest power transmission towers in India till date were located at Rihand lake in Uttar Pradesh with a height of 185 metres.
Company officials said the towers are designed by Elias Ghannoum, an international expert on designing transmission lines.
The 400 KV twin circuit twin moose transmission line is specially designed to withstand wind force on the conductors as well, as these are in a high wind zone.
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