Knowledge is our strength


Knowledge is our strength

Our geothermal competence and associated network have developed over several decades. The team has broad experience in energy systems based on geothermal energy and extensive experience from the oil and gas industry.

Our team

Our investors and shareholders


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Established in 2007, Kerogen Capital is a private equity fund manager specializing in international energy. Kerogen has over USD 2 billion in Assets Under Management.

Founders and management team

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GTML was founded in 2019 by Thor Erik Musæus, Bjørn Ståle Tennfjord, Thilo Theloy, Pål Jarness, Sjur Talstad and Bjørn Inge Tønnessen. The founders have broad experience from geothermal energy development and the oil and gas industry.

Board members

  • Anish Patel

    Anish Patel, Chair

    Partner and Investment Committee member of Kerogen Capital. Over 15 years’ experience in investments and corporate finance in the energy industry.

  • JR

    James Rigg, Board Member

    Senior Asset Manager and member of the Kerogen Capital technical team based in London. Experienced in geoscience, field appraisal, investing and M&A and has worked in the energy industry since 2010.

  • Julesvan Limborgh

    Jules van Limborgh, Board Member

    Managing Director and Head of the Technical team at Kerogen Capital. More than 35 years upstream oil and bank industry experience with a focus on geoscience, drilling and well testing operations, field appraisal and development, and commercial negotiations.

  • Tom Nysted

    Tom Nysted, Board Member

    Extensive management experience from industrial and commercial executive positions in several industries, including 13 years as CEO of Agder Energi. Deep insight into energy markets and the ongoing changes.

  • GTML 19 corr

    Pål Jarness, Board member

    Broad and solid experience from leading positions in finance and operations with a range of industrial and
    PE-owned businesses.

  • GTML-13

    Bjørn Inge Tønnessen, Board Member

    35 years of experience from the oil & gas and financial markets sectors. Founder and CEO of Spike Exploration & Edge Petroleum. Chairman of Oslo listed Questerre Energy.

Code of conduct


Our Code of Conduct governs our expectations and requirements for ethical practices in our business.