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Proceedings 2020 for room 4

Workshop 4/2: Environmental impacts and environmentally sound development of near-surface geothermal systems (in German)

Chair of the meeting: Christiane Lohse, Umweltbundesamt

Summary of the meeting

The German energy system transformation comprises the "sustainable transformation of the energy system with the goal of comprehensive climate, environmental and health protection, resource conservation and avoidance of external costs, supply and accident risks" (UBA, 2019). Through its own work and in cooperation with researchers, the Federal Environment Agency shows ways in which a substantial reduction in GHG emissions, including decarbonisation, can be achieved through the efficient supply, distribution and use of energy. In the heat sector, an essential part of the solution will be the use of the geological subsurface for energy supply and storage. The above-mentioned research project is dedicated to this approach. The workshop will present and discuss the as yet unpublished results of the project, which was conducted under the scientific direction of Prof. A. Dahmke (CAU, Kiel).

In addition to the investigation of proven and possible significant environmental impacts that would stand in the way of an environmentally sound expansion of renewable heating/cooling supply through geothermal systems, an assessment of the possible contribution to climate protection and further environmental relief through the use of near-surface geothermal energy was also carried out. In addition to the technical design of the heating/cooling supply systems, the possible climate protection contribution depends on the sustainably usable potential of the geological subsurface, which is limited due to the land and space requirements of the systems, especially in urban areas. Therefore, based on a potential and technology analysis of such systems, the technical and regulatory issues were addressed and recommendations for the regulatory framework including technical intervention approaches were developed.

Presentations

>>> Environmental impacts and climate protection contribution of geothermal heating and cooling systems
Ralf Köber
Christian-Albrechts University of Kiel, Germany

- Climate change contribution of UTES systems and adverse environmental impacts of other RES

- Geochemical, microbial and faunistic effects of UTES

- Interactions of UTES with contaminated sites and potential handling options

- Presentation of other aspects/impacts covered: Material ageing including minimisation and remediation options, EWS leaks, latent heat storage, corrosion, colloids and nanoparticles, F-Gas regulation, etc.

>>> Thermal subsurface management as a legal control task
Christian Maaß
Hamburg Institute, Germany

- Legal control instruments for the thermal use of the underground in cities

- Regulatory solution options for conflicting use claims

- Discretionary water law planning as a solution approach

>>> Open discussion, questions contributions - Introduction and netiquette rules
Christiane Lohse1, Soenke Bohm2, Frank Dethlefsen3
1Umweltbundesamt, Germany; 2CAU, KGE; 3CAU, KGE

>>> Summary and perspectives
Holger Born1, Andres Dahmke2
1Fraunhofer IEG Bochum; 2Christian-Albrechts University of Kiel, Germany

>>> Environmental policy conclusions
Christiane Lohse
Federal Environmental Agency, Germany

Workshop 4/1: Environmental impacts and environmentally compatible expansion of near-surface geothermal systems (in German)

Chair of the meeting: Christiane Lohse, Umweltbundesamt

Summary of the meeting

The German energy system transformation comprises the "sustainable transformation of the energy system with the goal of comprehensive climate, environmental and health protection, resource conservation and avoidance of external costs, supply and accident risks" (UBA, 2019). Through its own work and in cooperation with researchers, the Federal Environment Agency shows ways in which a substantial reduction in GHG emissions, including decarbonisation, can be achieved through the efficient supply, distribution and use of energy. In the heat sector, an essential part of the solution will be the use of the geological subsurface for energy supply and storage. The above-mentioned research project is dedicated to this approach. The workshop will present and discuss the as yet unpublished results of the project, which was conducted under the scientific direction of Prof. A. Dahmke (CAU, Kiel).

In addition to the investigation of proven and possible significant environmental impacts that would stand in the way of an environmentally sound expansion of renewable heating/cooling supply through geothermal systems, an assessment of the possible contribution to climate protection and further environmental relief through the use of near-surface geothermal energy was also carried out. In addition to the technical design of the heating/cooling supply systems, the possible climate protection contribution depends on the sustainably usable potential of the geological subsurface, which is limited due to the land and space requirements of the systems, especially in urban areas. Therefore, based on a potential and technology analysis of such systems, the technical and regulatory issues were addressed and recommendations for the regulatory framework including technical intervention approaches were developed.

Presentations
10 am - 10:20 am :
>>> The use of the geological subsoil to achieve climate neutrality of the building stock (in German)
Rother, Stefan; Lohse, Christiane
Federal Environmental Agency, Germany

10:20 am - 10:40 am:
>>> Assessment of the spatial development potential of near-surface geothermal energy in Germany (in German)
Menberg, Kathrin
KIT, Germany

10:40 am - 11 am:
>>> System comparison of geothermal heating and cooling systems - technologies and fields of application as well as strengths, weaknesses and risks (in German)
Hansen, Carsten
Consulaqua, Germany

11 am - 11:20 am:
>>> Documentation of environmental impacts and climate protection contribution of near-surface, geothermal, sensitive and latent heat storage systems (in German)
Köber, Ralf
Christian-Albrechts University of Kiel, Germany

11:20 am - 11:40 am:
>>> Thermal underground management as a legal control task (in German)
Maaß, Christian
Hamburg Institute, Germany

11:40 am - 12 pm:
Breakout Groups
Lohse, Christiane; Rother, Stefan
Federal Environmental Agency, Germany

Q&A
Dahmke, Andreas
Christian-Albrechts-University of Kiel , Germany

Summary and outlook
Lohse, Christiane
Federal Environmental Agency, Germany

Monday, 9th November

10 am - 12 pm CEST

Workshop 4/1: Environmental impacts and environmentally compatible expansion of near-surface geothermal systems (in German)

Chair of the meeting: Christiane Lohse, Umweltbundesamt

Summary of the meeting

The German energy system transformation comprises the "sustainable transformation of the energy system with the goal of comprehensive climate, environmental and health protection, resource conservation and avoidance of external costs, supply and accident risks" (UBA, 2019). Through its own work and in cooperation with researchers, the Federal Environment Agency shows ways in which a substantial reduction in GHG emissions, including decarbonisation, can be achieved through the efficient supply, distribution and use of energy. In the heat sector, an essential part of the solution will be the use of the geological subsurface for energy supply and storage. The above-mentioned research project is dedicated to this approach. The workshop will present and discuss the as yet unpublished results of the project, which was conducted under the scientific direction of Prof. A. Dahmke (CAU, Kiel).

In addition to the investigation of proven and possible significant environmental impacts that would stand in the way of an environmentally sound expansion of renewable heating/cooling supply through geothermal systems, an assessment of the possible contribution to climate protection and further environmental relief through the use of near-surface geothermal energy was also carried out. In addition to the technical design of the heating/cooling supply systems, the possible climate protection contribution depends on the sustainably usable potential of the geological subsurface, which is limited due to the land and space requirements of the systems, especially in urban areas. Therefore, based on a potential and technology analysis of such systems, the technical and regulatory issues were addressed and recommendations for the regulatory framework including technical intervention approaches were developed.

Presentations
10 am - 10:20 am :
>>> The use of the geological subsoil to achieve climate neutrality of the building stock (in German)
Rother, Stefan; Lohse, Christiane
Federal Environmental Agency, Germany

10:20 am - 10:40 am:
>>> Assessment of the spatial development potential of near-surface geothermal energy in Germany (in German)
Menberg, Kathrin
KIT, Germany

10:40 am - 11 am:
>>> System comparison of geothermal heating and cooling systems - technologies and fields of application as well as strengths, weaknesses and risks (in German)
Hansen, Carsten
Consulaqua, Germany

11 am - 11:20 am:
>>> Documentation of environmental impacts and climate protection contribution of near-surface, geothermal, sensitive and latent heat storage systems (in German)
Köber, Ralf
Christian-Albrechts University of Kiel, Germany

11:20 am - 11:40 am:
>>> Thermal underground management as a legal control task (in German)
Maaß, Christian
Hamburg Institute, Germany

11:40 am - 12 pm:
Breakout Groups
Lohse, Christiane; Rother, Stefan
Federal Environmental Agency, Germany

Q&A
Dahmke, Andreas
Christian-Albrechts-University of Kiel , Germany

Summary and outlook
Lohse, Christiane
Federal Environmental Agency, Germany

2 pm - 4 pm CEST

Workshop 4/2: Environmental impacts and environmentally sound development of near-surface geothermal systems (in German)

Chair of the meeting: Christiane Lohse, Umweltbundesamt

Summary of the meeting

The German energy system transformation comprises the "sustainable transformation of the energy system with the goal of comprehensive climate, environmental and health protection, resource conservation and avoidance of external costs, supply and accident risks" (UBA, 2019). Through its own work and in cooperation with researchers, the Federal Environment Agency shows ways in which a substantial reduction in GHG emissions, including decarbonisation, can be achieved through the efficient supply, distribution and use of energy. In the heat sector, an essential part of the solution will be the use of the geological subsurface for energy supply and storage. The above-mentioned research project is dedicated to this approach. The workshop will present and discuss the as yet unpublished results of the project, which was conducted under the scientific direction of Prof. A. Dahmke (CAU, Kiel).

In addition to the investigation of proven and possible significant environmental impacts that would stand in the way of an environmentally sound expansion of renewable heating/cooling supply through geothermal systems, an assessment of the possible contribution to climate protection and further environmental relief through the use of near-surface geothermal energy was also carried out. In addition to the technical design of the heating/cooling supply systems, the possible climate protection contribution depends on the sustainably usable potential of the geological subsurface, which is limited due to the land and space requirements of the systems, especially in urban areas. Therefore, based on a potential and technology analysis of such systems, the technical and regulatory issues were addressed and recommendations for the regulatory framework including technical intervention approaches were developed.

Presentations

>>> Environmental impacts and climate protection contribution of geothermal heating and cooling systems
Ralf Köber
Christian-Albrechts University of Kiel, Germany

- Climate change contribution of UTES systems and adverse environmental impacts of other RES

- Geochemical, microbial and faunistic effects of UTES

- Interactions of UTES with contaminated sites and potential handling options

- Presentation of other aspects/impacts covered: Material ageing including minimisation and remediation options, EWS leaks, latent heat storage, corrosion, colloids and nanoparticles, F-Gas regulation, etc.

>>> Thermal subsurface management as a legal control task
Christian Maaß
Hamburg Institute, Germany

- Legal control instruments for the thermal use of the underground in cities

- Regulatory solution options for conflicting use claims

- Discretionary water law planning as a solution approach

>>> Open discussion, questions contributions - Introduction and netiquette rules
Christiane Lohse1, Soenke Bohm2, Frank Dethlefsen3
1Umweltbundesamt, Germany; 2CAU, KGE; 3CAU, KGE

>>> Summary and perspectives
Holger Born1, Andres Dahmke2
1Fraunhofer IEG Bochum; 2Christian-Albrechts University of Kiel, Germany

>>> Environmental policy conclusions
Christiane Lohse
Federal Environmental Agency, Germany

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