IVL Swedish Environmental Research Institute

Energy-efficient and sustainable building: Renovation of a 1970s office building

The City block Pennfäktaren in Stockholm, originally built in 1970s, was rebuilt to become one of Stockholm’s most modern and sustainable office buildings.

The building houses over 12,000 sqm and has been transformed to a modern and environmentally-friendly office building with several intelligent cleantech solutions, which have resulted in a 50% reduction of its energy consumption.

The block Pennfäktaren encompasses 10 floors: 8 office floors, a restaurant floor at street level and a garage level. The total area is approximately 15,500 sqm. During the renovation, the building was equipped with energy-efficient windows and glass facades with low heat transmission characteristics. The roof is partly covered with sedum (a type of green roof system), which picks up air pollution and is better at managing storm water. The sedum roof helps to reduce the amount of water to, and the load on, the stormwater system in the city. Solar cells and solar collectors have been installed on the roof with the capacity of 5,000 kWh electricity and 50,000 kWh heat. These measures have contributed to the fact that the building has managed to reduce its energy consumption by 50%, from 260 kWh/sqm to about 125 kWh/sqm.


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