• 2018–

    Sale of 80 % of the shares in Tonstad Wind Farm

    Jens headed Thommessen's team that assisted ENGIE in the sale of 80% of the shares in Tonstad wind farm to the infrastructure fund SUSI Partners, a Swiss investment fund specialising in renewable energy infrastructure. Norsk Hydro's wholly-owned subsidiary Hydro Energy is buying 100% of the park's electricity production of approximately 0.7 TWh per annum for the first 25 years after commissioning and will be handling balancing and nominations during the term of the contract. The contract will help to supply Hydro’s aluminium works in Norway.

  • 2017

    Sale of Tysnes kraftlag to BKK

    Jens heads the Thommessen team assisting Tysnes Kraftlag in the sale of the company's business to BKK. In return Tysnes Kraftlag will become an owner of BKK. Thommessen has assisted Tysnes Kraftlag at all levels of the process, including with conversion of the company, license applications and contracts, and will continue to assist in the merger process.

Work experience

  • 2011
    Admitted to the Supreme Court of Norway
  • 2007–
    Partner, Oslo office, Thommessen
  • 2004–2006
    Senior Associate, Oslo office, Thommessen
  • 2002
    Admitted to the bar
  • 2000–2003
    Associate, Oslo office, Thommessen
  • 1998–1999
    Research Assistant, Scandinavian Institute of Maritime Law, Petroleum Law Dept, University of Oslo


  • 2000–
    Candidate in Jurisprudence, University of Oslo
  • 1997–
    German for lawyers, University of Oslo


  • Co-author of the treatise on the Norwegian Energy Act (published in Norwegian: “Energiloven med kommentarer”)


  • Author of the book “Revenue Cap Regulation of Electricity Distribution Companies” (published in Norwegian: “Inntektsrammeregulering av kraftnettselskaper”