Norway: Neptune Energy installs world’s longest ETH production pipeline 03 Aug 2021 Neptune Energy has announced the safe and successful installation and testing of the world’s longest trace-heated subsea production pipeline at its operated Fenja field in the Norwegian sea. The 37 kilometre electrically trace-heated (ETH) pipe-in-pipe solution will transport oil from the field to the Njord A platform, operated by Equinor. The innovative use of the ETH pipe-in-pipe significantly reduced the potential cost of the development by enabling the field to be tied back to existing infrastructure. Neptune Energy’s Director of Projects and Engineering in Norway, Erik Oppedal, said: