The four endorsed nominations for the European Geothermal Innovation Award 2015 are, in alphabetical order:
- Comacchio s.r.l. (Italy), for their innovative GEO 909 GT drilling rig allowing faster installation of borehole heat exchangers for shallow geothermal applications.
- gec-co GmbH (Germany), for their controllable, downhole pressure retention valve for hydrogeothermal installations in aquifers with dissolved minerals and gases.
- Green Energy Group SA (Norway), for their innovative business model and global technology approach for small-scale geothermal power plants in high enthalpy zones.
- Mijn Water B.V. (Netherlands), for their intelligent hybrid energy infrastructure for sustainable heating and cooling, based on geothermal buffers (e.g. abandoned mines).