Study "Cost Relevance of Energy Standards in Residential Construction
Published
of the city of Freiburg im Breisgau
Contractor: Joachim Eble Architecture, Rolf Messerschmidt, Tübingen
EGS-Plan engineering company for energy, building and solar technology mbH
IER Institute for Energy Economics and Rational Use of Energy, University of Stuttgart
Results: When analysing the total annual costs, the running costs and revenues in the utilisation phase are taken into account in addition to the capital-related investment costs. The result of this full cost calculation is a relatively homogeneous cost level for all building energy standards examined. Due to the subsidies for the better standards, lower energy costs and the use of subsidies, the cost level remains relatively constant among the building energy standards. Thus, higher building energy standards up to the "KfW 40 Plus Standard" are already economically attractive today.
The influence of building energy standards can be classified as subordinate when considering total consumer spending.
Over the last 30 years, numerous tools have been developed to assess the ecological or sustainable aspects of buildings. This book discusses the role these tools can play in the implementation of the UN's 'New Urban Agenda'.
Berlin, 22 October 2018: Vattenfall Energy Solutions, Gewobag and the energy storage start-up Lumenion are jointly piloting a new type of sector-coupled steel storage system at Bottroper Weg in Berlin-Tegel, which absorbs regional generation peaks from wind and solar energy in a grid-serving manner and later provides the renewable energy as heat and electricity in line with demand.
"With this pilot project, we want to demonstrate the particular technical and economic suitability of thermal storage systems for the effective utilisation of large quantities of wind and solar energy in a very practical way," says Alexander Voigt, founder and Managing Director of Lumenion. "Some of our team have been working with renewable energies for over 30 years and with energy storage systems for over ten years. Based on this experience, we made a conscious decision in favour of steel as a storage medium for the second phase of the energy transition, which is just beginning."
The Lumenion steel storage system stores "electricity peaks" for less than 2 cent/KWh in a cost- and space-efficient manner at up to 650° Celsius as heat, which can be converted back into electricity using a turbine unit if required - or used entirely as heat. As a co-founder of Solon, Q-Cells and Younicos, among others, Voigt has been successfully launching solar modules and storage systems on the market since the 1990s.
Hanno Balzer, Managing Director of Vattenfall Energy Solutions GmbH: "Decentralised systems and energy storage are key factors in the energy transition; heat is a particularly cost-effective form of storage. If the stored energy can then be utilised not only as heat but also in the form of electricity, that is a milestone. The high-temperature storage system brings us a big step closer to this!"
Karsten Mitzinger from Gewobag Energie- und Dienstleistungsgesellschaft adds: "The energy transition can only succeed if it is decentralised and based on partnership. As a housing industry, we are making our contribution to climate protection in our neighbourhoods. With this project, we are pleased to be able to demonstrate the good cooperation between energy supply companies, municipal housing associations and innovative start-ups. Only together can we master the major challenges of the energy transition."
In the Tegler pilot project, a 2.4 megawatt hour (MWh) storage block is being trialled for commercial use and transferred to regular operation. To this end, the unit will be integrated with an existing gas-powered CHP unit from Vattenfall Energy Solutions into the neighbourhood electricity and local heating supply of a 1970s apartment building owned by Gewobag. The storage system will temporarily absorb any power peaks that are not required and feed them into the heat supply later on as needed. In a second step, a reconversion into electricity is also planned.
Parallel to the construction of the pilot project, Lumenion is testing a 450 kWh prototype on the campus of the University of Applied Sciences (HTW) in Oberschöneweide. The HTW is supporting Lumenion with practical accompanying research in the development, testing and validation of data, as well as in the regulation and operational management of the innovative storage system.
In further projects, Lumenion storage systems with 40 MWh and even 1,400 MWh are to be created as the next milestones. These giga-storages can integrate existing and newly added large quantities of renewable electricity generation from wind and solar power into the existing grids in a particularly favourable, efficient and demand-oriented manner, thus enabling a significant acceleration of the energy transition.
Cooperation between municipal utilities and berlinovo for largest German tenant electricity project
Mietersonne Kaulsdorf, Germany's largest tenant power project with almost 3.4 megawatts (MW) of capacity, is being built by Berliner Stadtwerke for the Berlin housing association berlinovo in Marzahn-Hellersdorf. Tenants of 4,300 apartments will be able to benefit from the green electricity generated directly on their roofs.
The dimensions of the project, consisting of 39 solar systems on one hundred residential buildings in the district between Wuhletal and Hellersdorfer Strasse, speak for themselves: a total of 27,000 m² are covered with modules, which corresponds to 3.8 times the area of a football pitch. The yield is estimated at around 2.9 million kilowatt hours per year, which is equivalent to the entire electricity requirements of 1,200 two-person households. This means that approx. 1,580 tons of CO2-emissions were avoided. Berliner Stadtwerke is investing around €3.75 million in this project. This year, 2.0 MW of the total 3.4 MW will be installed, around 60 percent of which have already been installed on the roofs since May. A further 1.4 MW is to follow in 2020 and 2021.
Photos: Pritzkuleit
"Berlin is catching up," says Berlin's energy senator Ramona Pop. "We still have a lot of space on our roofs that we can use to work sustainably and efficiently for the energy transition here in the city. Until the federal government finally meets the requirements of the urban energy transition, we cannot wait, after all, the climate crisis is not waiting either. We are working at full speed to expand solar energy in Berlin. With the Mietersonne project, we are taking the biggest step on this path so far."
Finance Senator Dr. Matthias Kollatz explains: "In order to achieve Berlin's ambitious climate protection goals, we must double the speed of the energy transition. Relying on private initiatives alone is not enough. The commitment of the public sector is required. This example of municipal cooperation is exemplary - and an important driver in a very central climate protection area."
"We built the largest part of the facility this year," says Stadtwerke Managing Director Dr. Kerstin Busch. "Important for the success of the project is a high level of acceptance among the tenants, which we are also promoting on site with our own customer center at the Spree Center, among other things." Including the Mietersonne Kaulsdorf project, Stadtwerke will install around 4 MWp on Berlin roofs this year.
"Thanks to the cooperation with Berliner Stadtwerke, berlinovo tenants in the Kaulsdorf district will in future be able to obtain cheap local and clean electricity 365 days a year. At the same time, we are making the plat-ten buildings fit for the future and helping to achieve Berlin's climate targets," emphasises Alf Aleithe, Managing Director of berlinovo.
Berlin public utility company
Berliner Stadtwerke is a subsidiary of Berliner Wasserbetriebe. They are committed to consumer-oriented energy generation and environmentally friendly supply concepts based on renewable energies. To date, Berliner Stadtwerke has invested €30.4 million in renewable energies, in Berlin primarily in new solar power plants in the districts. This means they have built more than 40 percent of the solar capacity installed in Berlin since 2016. Information about and registration for the environmentally friendly "berlinStrom" at www.berlinerstadtwerke.de
About berlinovo
berlinovo was formed in 2012 from BIH Berliner Immobilien Holding GmbH, founded in 2006, and its subsidiaries. berlinovo is an investment of the State of Berlin. The portfolio includes 246 properties, one of which is abroad. Nationwide, berlinovo manages 23,500 rental units with a total rental area of 2.55 million m² and an annual target rent of over €249.0 million. These include around 15,200 apartments, 6,500 furnished apartments and 1,800 commercial units (as of 31 December 2018). berlinovo employs around 340 people.
The parliament of Bremen wants to oblige the use of solar energy on all new and existing buildings in Bremen and Bremerhaven. Whenever the roof surface is completely renewed, they are to be equipped with a solar system in the future. This is photovoltaics and, if necessary, also solar thermal energy. The Senate is currently examining the latter.
According to the solar roof cadastre, the potential is a theoretical peak output of 1,550 MW and an annual electricity generation of 1,410 GWh. If the steel industry is excluded, this corresponds to about 40 % of the current electricity consumption in the state of Bremen. The municipal housing associations should serve as pioneers of solar energy use with tenant electricity and realise corresponding model neighbourhoods.
According to Solarserver.de, this makes Bremen the Hamburg, Baden-Württemberg and Berlin the fourth federal state to tackle a solar obligation.
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