Strategic Asset

Sustainability target

eurhonet whitebook

Different UE countries adopted different strategies to reach targets of sustainability, to reduce environmental pollution and to promote energy saving.

During the meeting in Darmstadt Prof. Sebastian Fiedler shows what can Gewoba contribute to the global climate protection activities, which goals can be set, what measures have to be taken to achieve these goals and how can the activities be managed, in order to make sure, that the goals are achieved. These are the initial questions in 2016.

The climate protection goals for 2050 are:

  • Reduce GHG emission at least 80% (compared to 1990)
  • Reduce non renewable energy use at least 60%
  • Reduce non renewable primary energy demand at least 80% (compared to 2008)

There was also a renovation rate target was cancelled because it was unclear.

Furthermore there is an additional Bremen target: the municipality aims to reach a 100% renewable energy in Bremen.

To reduce GHG emissions, Gewoba set a specific value per m2 living space, instead of an absolute value, because the housing stock is growing due to the political pressure and want to reduce CO2 emission from 39 kg/m2a in 1990 to 7.8kg/m2a in 2050.

In 2015 the annual CO2 emission is different from different areas, because of business operation, housing inventory and tenants. Business operations (GEWOBA’s office) are almost negligible, the biggest part is about household electricity and mobility, that is directly connected to tenants behavior.

For future analysis there will also be the need to to take into account the embodied emission (grey energy).

The focus of Gewoba is on heating in housing inventory. Gewoba do energy audit and retrofit headquarters. They go to tenants and talk about different energy production.

In Gewoba buildings 71.6% are supplied by district heating (third parties), this means that Gewoba cannot have a direct influence on the production.

If you want to reduce overall CO2 emission you can act:

  • on building and tenant side
  • on energy supply

Acting on these two sides you can reach the 80% reduction.

Gewoba wants to optimize what they know about buildings, wants to optimize measures and develop database. They collect yearly data and building related data input, than they evaluate the measures and integrate into portfolio management.

They have some initial projects, where they test their ideas and make improvements.


Another interesting example of Sustainability Targets at an urban scale was shown during the meeting in Manchester. Mark Atherton presented the Manchester’s 2038 ambitions.

Greater Manchester’s Mayor has set a new ambition for the City Region to be one of the cleanest and greenest in Europe. Manchester is about 3 million people, if cities like Manchester don’t reach the CO2 reduction target, nobody will. The city Region is now planning how to achieve these goals through research, modeling techniques and innovative financing models. The target is ambitious, but technology is running fast.

Research has highlighted that use of electricity and gas in buildings accounts for 72% of direct CO2 emissions. Longer term targets require energy efficiency, low or zero carbon heating, however technical potential for 9% of our electricity demand and 68% of our heat demand come from renewable sources.

They draw up a list of highest impact local action:

  • renewable energy production
  • energy efficiency of domestic properties
  • improved efficiency of commercial heating and cooling
  • biomass power generation
  • shift from fossil fuels to battery or fuel cells for transport
  • shifting domestic transport behavior
  • waste reduction, reuse and recycling

They did a scenario analysis with 4 different levels, the 4th is the most difficult to reach, because take into account technologies that still don’t exist.

A complicate algorithm was developed to understand which is the best strategy to reach the target at regional level. A two steps transition is imagined since people would change the boiler from now to 2035.

They are developing models, not technologies, so they test, develop and then make it massive.


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