The study "Greenhouse gas balancing of timber buildings -implementation of new requirements for life cycle assessments and determination of empirical substitution factors (GHG timber construction)" led by Prof. Dr. Annette Hafner (RuhrUni Bochum) has now been published.
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.
Eight hectares of modules built on Berlin's roofs, almost half of them on residential buildings
Berlin's municipal utility is clearly picking up the pace in the expansion of solar installations in the capital. The municipal green electricity producer exceeded the 10 megawatt threshold at the end of September.
Since the commissioning of their first solar plant on a GESOBAU house on Rolandstraße in Pankow, the output installed by the municipal utility has thus increased exactly a hundredfold. Behind the 10 megawatts peak (MWp) built, which corresponds to around one tenth of all solar power installed in Berlin from large to single-family homes, are more than 150 individual systems.
Around 4.3 MWp of the 10 MWp were erected for tenant electricity systems with housing associations and cooperatives as well as homeowners' associations. In these projects, tenants or owners can obtain the electricity generated on their own roofs directly and particularly cost-effectively and thus contribute to the energy transition themselves. Around 5.7 MWp have been installed on state-owned properties - schools, sports halls, administrative and cultural buildings, prisons and fire and police stations.
All of the plants constructed by Berliner Stadtwerke have a combined module area of 80,000 m² or 8 hectares, which is equivalent to a good eleven football pitches. The plants completed to date save the atmosphere around 4,900 tonnes of CO2. By the end of the year, Berliner Stadtwerke plans to install a further 2 MWp of connected solar capacity.
The municipal council of the city of Wels has adopted a declaration on passive house construction. In it, the municipal council is instructed to strive for the energy-saving passive house standard in all new buildings and renovations of the city and municipal enterprises. This resolution, which was passed unanimously, was apparently inspired by the city of Frankfurt a.M., which, according to current political decisions, will only build according to the passive house standard in the future.
" nachrichten.at/regional/wels/685456
Prof. Maja Göpel is a member of the Scientific Advisory Board of the German Federal Government and a member of Scientists for Future. She criticizes that Germany's climate goals cannot be achieved with the climate package of the Grand Coalition.
"The reactions to the key points on climate protection adopted by the Climate Cabinet last Friday are predominantly negative from the point of view of renewable energies. Representatives of associations are positive about the planned increase in the construction of offshore wind farms. "The lifting of the 52 GW cap on photovoltaics is also to be welcomed," says Marie-Luise Wolff, President of the German Association of Energy and Water Industries (BDEW). The BDEW President also sees it as positive that the coalition was finally able to bring itself to exempt energy storage systems from existing levies." www.solarserver.de/...klimaschutzplaene-nicht-ausreichend.html
The Frankfurter Rundschau writes: "The climate policy reform package that the grand coalition has now brought about does not live up to the claim. More electric cars on the road, more rail travel, less flying - measures that advance this are steps in the right direction. But instead of specifically displacing fossil energies, a hodgepodge of expensive subsidy measures is supposed to encourage people to act in a climate-friendly way. What is lacking above all is a consistent dismantling of subsidies that are harmful to the climate and the environment, which have just the opposite effect and amount to more than 50 billion euros annually - including the diesel privilege and the commuter tax allowance. They prevent climate-damaging behaviour from becoming expensive and climate-friendly behaviour from becoming worthwhile. Their gradual melting would also free up funds to finance the climate protection turnaround. But the grand coalition has once again caved in to the lobby interests that are stonewalling against it, and the conjured-up climate crisis does nothing to change that." www.fr.de/meinung/pillepalle-20-klimaschutzpaket-wird-anspruch-weitem-nicht-gerecht-13023518.html
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The study "Greenhouse gas balancing of timber buildings -implementation of new requirements for life cycle assessments and determination of empirical substitution factors (GHG timber construction)" led by Prof. Dr. Annette Hafner (RuhrUni Bochum) has now been published.
