Five people have been charged with aggravated trespass on land where a gas pipeline that will span the breadth of Wales is currently under construction.
The pipeline will run from Pembrokeshire to Gloucestershire
Three women aged 19, 21 and 24 and two men aged 20 and 25 from the Bristol and Sheffield areas were held on Wednesday at Trebanos in the Swansea Valley.
They have been bailed to appear at Neath Magistrates Court on Tuesday.
The village has seen several protests, with activists occupying a section of pipe for over a week late last year.
The 200 mile (322km) pipe will carry natural gas from two liquefied natural gas (LNG) terminals in Pembrokeshire to join up with the main UK network in Gloucestershire.