The permits, which are required for the station to operate, will allow it to: discharge and dispose of radioactive wastes; discharge cooling water and liquid effluents into the Bristol Channel and to operate standby power supply systems using diesel generators, the Environment Agency said in a 14 March statement.

"The limits and conditions that the Environment Agency has set in the permits will ensure that people and the environment are properly protected," it said.

The permits were challenged by the Nuclear Free Local Authorities (NFLA) and other Non-Governmental Organizations, which raised concerns about the methodologies used for assessing the impacts of radioactive emissions to air, sea & land.