Addressing a press conference here, Union Environment Minister Jayanthi Natrajan said the finalised site in the Arabian sea, a 18-hectare rock, was a safe place.
"Even during high tide, the rock stands 3 to 4 meters above sea-level," she said.
The project, which will come up in Coastal Regulation Zone-4 (where no construction is allowed), was approved in principle as a special case, the Union Minister said.
"We have studied the case thoroughly and are satisfied. No commercial activity is being allowed," she said.