Clean energy retrofits

In der Kölner Stegerwaldsiedlung werden 600 Wohnungen energetisch saniert.

On Cologne’s Stegerwald estate, 600 homes are undergoing energy retrofits. (Photo: EnergyAgency.NRW)

November 16, 2018 – The German state of North Rhine-Westphalia (NRW) has named the Stegerwald estate in Cologne’s Mülheim district as its 87th climate protection housing estate. Stegerwald is also the largest project to be selected for the scheme to date. The housing company DEWOG is retrofitting around 600 apartments in 16 buildings from the 1950s. It is also building additional stories to create 95 new apartments. RheinEnergie AG was responsible for the energy planning.

As part of the retrofits, building facades will be insulated and new triple-glazed windows fitted. The gas-powered systems that provided heat to each story or building for space heating and hot water will be replaced by heat pumps and district heating. Large rooftop PV systems with a total peak power of 968 kWp will be installed. Battery storage will be used in conjunction with an estate-wide management system to help ensure that the majority of the self-generated PV power can be used on the estate for the heat pumps, for charging electric vehicles and as affordable tenant power. Residents can use smart meters to learn about their personal energy consumption and current electricity prices. The retrofits should be completed in the course of 2019.

In total, the state of NRW wants to launch 100 climate protection housing estates. On the 37 estates already created, encompassing a total of 2,200 houses and apartments, heat-related CO2 emissions have been reduced by between 50 and 90 percent.

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