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BN - Is the roof of my house or company building suitable for a photovoltaic system or a solar thermal system? This question can now be answered quickly and conveniently online with the help of the new solar roof cadastre of the city of Bonn. In a building-specific map display, a coloured marker indicates whether and to what extent a roof is suitable for energy generation by means of solar power. Step by step, further information, for example on the economic efficiency, can be retrieved via a yield calculator.
The suitability of the roofs of all 129,000 buildings in the city for solar energy generation was recalculated using the latest, improved data. For this purpose, elevation grid data was used, which was determined by the district government of Cologne by means of laser scanning in spring 2016. Compared to the previous version from 2010, the new Bonn solar roof cadastre features, among other things, a fourfold higher resolution and a more differentiated designation of the roof areas.
The suitability of the roof surfaces for electricity generation via photovoltaic systems as well as for domestic water heating and, for the first time, also for supporting building heating via solar thermal collectors was calculated. The calculations also took into account the current changes in the framework conditions with regard to feed-in tariffs and self-consumption of generated solar power.
How the application works
In the city map, the installable system size and many additional data such as yields and savings potentials can be displayed for each building. In a newly developed yield calculator, costs and yields can be calculated and compared by entering additional user-specific information such as electricity consumption or household size. In this way, every owner can quickly gain an overview of the suitability of his or her building for the use of solar energy. Detailed instructions are available at www.bonn.de/...solardachkataster.php.
The City of Bonn points out that the information from the solar roof cadastre is an initial non-binding assessment. Essential prerequisites for a decision to build a system, such as the condition of the roof or the static suitability, can only be clarified by suitable specialist companies or qualified consulting organisations. Information on this can be found on the website of the solar roof register.
Bonn roofs have potential
According to the potential analysis of the solar roof cadastre, 6,800,000 square metres in Bonn are suitable for solar power generation. This corresponds to about the size of 950 football fields. Approximately 800,000 megawatt hours of electricity could be generated on this area. This could cover about 50 percent of the total electricity consumption in Bonn. For solar thermal energy, the result of the potential analysis shows 88,461 buildings in Bonn that could be used for this form of energy generation. This corresponds to about 70 percent of the buildings in Bonn.
How can people be helped to leave their cars behind more often for short journeys? Answers to this question are to be provided by a new project funded by the Federal Ministry for the Environment. The project "Living Leads Mobility" aims to create new opportunities and offers for climate-friendly mobility in the residential environment.
In up to five metropolitan regions, it aims to show tenants in particular attractive options for leaving their cars at home more often, switching to alternatives and thus doing something for climate protection and their own health.
Do I take the bike key or the car key? Mobility decisions for short journeys in the neighbourhood usually follow habit. With the new project "Living leads mobility", the project partners want to develop practicable and climate-friendly alternatives. By providing various mobility options directly at the place of residence, the aim is to increase choice and significantly reduce CO2 emissions. The offers include, for example, the installation of secure parking facilities for bicycles, walking frames and pushchairs, the establishment of a car-sharing station in the residential area or the simple posting of a bus timetable on the notice board of the residential complex. In practice, this means close cooperation between housing companies, local authorities and mobility service providers. Decision-makers receive information on suitable measures and advice on implementation issues. In a comprehensive guide, housing companies learn how to implement measures to promote mobility.
realise sustainable mobility. And tenants receive information and tips on climate-friendly mobility behaviour.
The joint project will be funded over the next three years with a total of around 1.1 million euros from the National Climate Initiative (NKI). The project partners are the German Ecological Transport Association (VCD) as project coordinator, the Öko-Institut and the German Tenants' Association (DMB). Companies and local authorities interested in taking part can contact us by email at Rainer.Hauck@vcd.org.
The German Association of Cities, the Global Parliament of Mayors and the international cities network ICLEI have joined forces to form a Cities Alliance to accompany the German G7 Presidency. The alliance is organising a conference on Tuesday, 3 May a U7 Mayors Summitwhich brings together high-level representatives of cities from the G7 countries. Representatives of the media are invited to follow the event virtually.
The international exchange is under the heading "Engaging the Urban World - Cities as Engines of Change for Peace, Democracy and Sustainability".. It is the most important event of cities in the framework of the German G7 Presidency. A joint declaration by the cities will also be adopted: In the „Urban7 Mayors Declaration“ the city leaders from the G7 countries will present their expectations of politics and business in order to meet the global challenges on the ground.
Participating and speaking as the German delegation will be:
Lord Mayor Markus Lewe, Münster, President of the German Association of Cities,
Lord Mayor Peter Kurz, Mannheim, Chairman Global Parliament of Mayors,
State Secretary Jochen Flasbarth, Federal Ministry for Economic Cooperation and Development
State Secretary Dr. Rolf Bösinger, Federal Ministry of Housing, Urban Development and Construction
The Mayors Round Table is also attended by city leaders from the G7 countries USA, Japan, Canada, Italy, the UK, France and the EU. Among the topics discussed at the event will be: Consequences of the war in Ukraine, role of cities in multi-level governance, impact of climate change, status of democracy, sustainable urban development, municipal development cooperation and the United Nations Global Sustainable Development Goals (SDGs). The Cities Summit is supported by the German Federal Ministry for Economic Cooperation and Development (BMZ) and the Service Agency Communities in One World (SKEW) of Engagement Global.
A press release of the German Association of Cities and its partners will also be published for the event. Further information is available on the Summit website at: https://g7u7.org/
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