Although thermal energy storage in aquifers (Aquifer Thermal Energy Storage, ATES) is a promising method, e.g. to provide summer heat surpluses for use in winter, there is a lack of well-founded analyses on local ATES potentials for most regions. Therefore, within the framework of the joint project PotAMMO, it is planned to investigate the potentials of an ATES integration into local heating grids, taking the regions of Mannheim and Offenbach as examples. A multi-criteria approach is to be pursued that takes into account geological and hydrogeological as well as technical, regulatory, climatic and economic parameters.
The joint project is divided into four work packages (WP). In the first work package, the current and future heat demand, the network structures and heat source potentials (waste heat and cooling) for storage in ATES plants are determined for the model regions of Mannheim and Offenbach. Furthermore, the geological and hydrogeological potential for aquifer storage is investigated and suitable storage horizons and locations are identified. The development of geothermal exploration methods and the development of grid expansion scenarios are also part of the planned work. In WP2, the thermodynamic characterisation of ATES and their integration into existing grids will be carried out by means of numerical modelling of district heating systems and identified storage horizons. Another focus is the interface development for model coupling and the creation of simplified ATES models for parameter studies and optimisation runs. The third work package focuses on the development of ecological and economic evaluation routines. These make it possible to draw up life cycle inventories for the entire life cycle of an ATES, taking into account the consumption of energy, raw materials and operating materials as well as the associated emissions. Furthermore, its economic efficiency is determined by calculating investment and operating costs. In WP4, a comprehensive system optimisation and system evaluation is carried out. This includes in particular the determination of design and operating parameters for the optimal integration of ATES systems into existing and planned grid infrastructures. In addition, system optimisation runs will be used to identify those processes that have the greatest influence on costs and greenhouse potential. Furthermore, it is planned to identify possible technical risks and to estimate their probability of occurrence and impact. With the completion of the project, methods and recommendations for action for the designation of ATES potentials will be provided, which can be transferred to other regions.
