In many climatic conditions heating and cooling systems can be decarbonized using seasonal thermal energy storage to over-come the mismatch in availability and demand with Aquifer Thermal Energy Storage (ATES). Regulatory drivers for ATES adoption: A) energy performance standards for buildings boosts demand for ATES B) uniform permitting and planning regulation provides easy access to the technology, also for late adopters. Technical drivers for ATES adoption: 1) high quality standards for wells 2) integration and optimization of wells with climate installation in the building ensures comfort and energy saving in practice.

This paper highlights the long-term numerical investigation of the Northern Gateway Heat Network, considering different sce-narios, including continuous space heating, space heating and recovery, space heating and cooling, and ATES. It also discusses the thermal impact and thermal plume development in different scenarios and how the thermal plume affected the system efficiency.

• This research investigates the effects of pile spacing on the thermal performance of thermo-active piles, quantifying the effects of thermal interference. • The thermal performance of a thermo-active pile is at maximum when it operates as a single standalone pile, with the lower bound corresponding to piles operating within an infinitely-large group. • The analyses performed show that in an infinitely-large group, the thermal performance of a thermo-active pile increases from 20% of that of a single pile for a spacing of 3 diameters to about 40% when that spacing increases to 6 diameters.

- Development of a thermal wastewater absorber that can be used both as a heat source and as a heat sink. - Numerical and experimental investigations to determine the performance and design concept. - The wastewater absorber is an elementary component of a fifth-generation heating network due to additionally installed pipes. It is therefore possible both to extract heat from the network and to supply it to it.

A large scale PSC prototype was constructed at University of Antwerp to investigate the thermal and structural performance of the PSC systems. Experimental results showed that applying a low temperature supply in wintertime could save above 80% of the collected heat, and remaining excess heat can be used for various applications (domestic hot water and heating to nearby buildings) It was concluded that the energy harvesting capability of PSCs is not only determined by the geometrical properties and geographical location of the installed systems, but also by the operational conditions such as fluid flow and weather parameters

The abstract describes the main technological aspects related to the installation of the 17-m-deep energy diaphragm walls at the underground car park of the Politecnico di Torino, currently under construction.