CO2 Neutral Energy System Utilising the Subsurface
The subsurface can be used to store excess energy produced by wind and sun as heat or gas. In combination with a CO2 neutral solution, whereby CO2 emissions from available sources are captured, stored temporarily and recycled for synthetic fuel production, such an energy system can prove to be efficient, sustainable and economically viable.
The objective of the project is to analyse the techno-economic feasibility of an integrated energy system, in which the subsurface is utilised for thermal energy production and storage as well as temporary CO2 storage. This will be achieved by modelling the technical feasibility, efficiency and economy of 3 subsurface technologies:
- 1. Electricity-to-heat storage by deep aquifer (>1000 m) thermal heat storage by injection of heated water using surplus electric energy produced by renewables and in combination with low enthalpy geothermal energy production.
- 2. Electricity-to-gas storage by chemical reactions of CO2/CH4 stored in subsurface geological structures and later re-electrified.
- 3. Storage of CO2 captured from biomass fired combined heat and power plant or high CO2 emitting industries and temporarily stored for future re-use, e.g. production of sustainable synthetic fuels.
Each component of the system will be modelled and their technical feasibility, capacity and dimensions will be evaluated together with an analysis of the overall integrated energy system and economic viability. Project results will be used to identify which technologies (if not all) are the most technically and economically attractive, and will be used as a solid base for further development of one or more of the technologies.
Key figures
Category
Participants
| Partner | Subsidy | Auto financing |
|---|---|---|
| Danmarks Tekniske Universitet (DTU) | 1,41 mio. DKK | 0,16 mio. DKK |
| Rambøll | 0,36 mio. DKK | 0,20 mio. DKK |
| SINTEF | 0,49 mio. DKK | 0,05 mio. DKK |
| GEUS | 2,91 mio. DKK | 0,32 mio. DKK |