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BI PV Project Details
Name projectCafé Ambiente
Year1997 (Start operation date)
PV applicationInclined roof - transparent roof
PV power total9 kWp
LocationBremen, Niedersachsen
Latitude/Longitude53°4'33"N 8°48'26"E
© www.solarnova.de

Project summary
The original rotunda building was constructed in 1929. It was used for serving food to poor people. In 1983 this service closed and the building was sold to the City of Bremen. A year later a leaseholder opens the “Café Ambiente”. He initiated cultural and literature events. Since then the Café developed itself as a cultural and gastronomical place in Bremen. In 1997 it was necessary to extend and to renovate the building completely. For the city of Bremen this provided the opportunity to demonstrate and promote the efficient energy use and the use of renewable energies on an existing building. Consequently the building became one of the pilot projects of the “Bremer Energie-Konsens”, the climate protection agency for the north German city-state of Bremen. The German branch of Friends of the Earth, Bund für Umwelt und Naturschutz Deutschland (BUND) developed the energy concept for the building. In total an investment of € 930.000,- was needed to carry out the renovation of the building. A subsidy of € 170.000,- was given by the local utility company, “swb Enordia”, and the climate protection agency of Bremen.

Best practice project
The building is a show case of the “Bremer Energie-Konsens”, the climate protection agency for the north German city-state of Bremen.

Special PV project info
PV architecture and building integrationThe PV-System is nicely integrated into the double glazed roof construction of the winter-garden. In total 159 semitransparent PV-Modules are used with a light transmission rate of 45% each. Due to the round shape of the winter-garden it was necessary to produce 20 different size and shapes of PV-modules. The custom made glass-glass PV-modules encapsulate 7270 polycrystalline cells (Type: RWE multi-crystalline) with a total power output of 9,5kWp. The estimated energy output is 5000 kWh per year.
PV ownership
Tariffs and meteringFeed-in-tariff
Remarks and recommended readingThe brochure "Umweltfreundliche Gastronomie" of Bremen´s climate protection agency “Bremer Energie-Konsens” describes in detail the different measures taken to cut down the energy demand of the Café Ambiente and to make use of renewable energy use. Special focus is given to a cut down of the energy demand in the kitchen of the building.

Other project data
Type of projectDemonstration Project
Other relevant aspectsZero-energy house
Start of PV project
Start operation PV system1997
Project leading companyBremer Energie-Konsens
Project contact person
Contact email
Contact addresswww.energiekonsens.de
Part of Urban Scale project

Building data
Use and function of the buildingEnterprises - unknown other or mixed
Building typeNon-residential buildings - 2 floors
New/Retrofit/AddedRetrofit building integration
PV building addressOsterdeich 69 a, D-28203 Bremen, Germany

PV system
PV applicationInclined roof - transparent roof
PV power total project9 kWp
Number of dwellings/units0
PV power per dwellings/units0 kWp
PV system typeGrid-connected - demand side
PV module typeLaminates - transparent laminate
PV cell typeCrystalline silicon - multi
PV module brand and typesolarnova SOL 33-100 ISO
PV inverter brand and type
Includes PV database product(s) 

PV cost and energy production
PV system investment
PV modules only costs
PV energy yield
PV energy user owner

Names and Addresses
Building OwnerPV ownerArchitectMain PV manufacturer
NameCity of BremenunknownSolarnova Produktions- und Vertriebsgesellschaft mbH
Addresswww.bremen.deAm Marienhof 6, D-22880 Wedel, Germany

Projects websitewww.cafe-ambiente.de
Other websites
Webpage Educational Tool

1. UmweltfreundlicheGastronomie.pdf (language: German)

(bipv) building integrated pv