It is clear that to address climate change, an energy transition which makes a large-scale use of the subsurface is needed. The subsurface will play a critical role in this transition, serving as a resource for new sources of energy production and storage, a foundation for energy infrastructure, and a repository for waste by-products from energy production (e.g., radioactive waste disposal, CO2 geo-sequestration). Furthermore, there are challenges in understanding material behaviour due to complex coupled phenomena, measuring material properties and upscaling the physical phenomena to engineering scale structures. Uncertainties, heterogeneities and long timescales offer additional challenges, as does bringing technology ever closer to dense populations. This is the topic of Energy Geotechnics. In the next decade and decades, society needs to complete the energy transition, and to do so the already substantial changes need to be vastly accelerated. This brings many challenges, which academics, consultants, contractors and authorities need to address together. [...]