The investors behind land-based company Salmon Evolution have teamed with two other investors to take a 23.3 percent stake in Norwegian biogas and fermentation technology group Hyperthermics.

Tore Tonseth and Roger Halsebakk of investment group Ronja Capital II, together with Peder Stette of Stette Invest and Frode Kjolas of Kjolas Stansekniver, now collectively hold almost a quarter of the company.

Based in Ulsteinvik, Norway, Hyperthermics delivers biogas production systems, as well as technologies that produce saleable