Climate Alliance

Source: geralt / pixabay

The cities Donaueschingen, Bad Dürrheim and Hüfingen have been members of the Climate Alliance ( Member cities have committed themselves to reducing greenhouse-gas emissions locally and support the conservation of the rainforest. Not only are they mindful of energy efficeny and renewable energy sources in regard to public buildings but they also encourage the general public to use renewable energy sources.

“Klimahaus” – rewarding energy renovations

The three south-Baar cities are participating in the nation-wide campaign “Klimahaus” of the national climate conservation- and energy agency (KEA). Houses that have been energy renovated commendably are awared with a sign pointing out the houses exceptional energy efficency. The house owner recive these signs for free.

Climate protection concepts

For a coordinated effort in climate protection, municipal climate protection concepts are essential. In 1992 Donaueschingen already ratified a programme of actions which are to be taken:Link.
An extensive climate protection concept for the cities Donaueschingen, Hüfingen and Bräunlingen was created from 2010 until 2012. It was supported by the Federal Environment Ministry. The final reports were collected and can be found online: Link.
The concept lists a lot of actions the cities can take to make its buildings and facilities more energy efficient. Other aspects include energy efficiency in private enterprises, optimisation of gas biogas plants and a promotion campaign to encourage house owners to energy renovate their property. Bad Dürrheim already has a climate protection concept for its public buildings.

The climate change concept developed for the GVV includes the following components:

1.) Examination of the energy efficiency measures in place concerning interior lighting

Contractor: Engineering Office Greiner, Konstanz

The energy saving potential related to interior lighting in several of the three towns’ civic properties were examined by the contractor. The lighting already in place was cataloged and defined as either in need of renewal or not and economic efficiency calculations were conducted. It was recommended that approx. 20% of the lights be replaced where energy savings of around 30% could be achieved. The recommendations are to be implemented by the civic building authorities. A kindergarden in Donaueschingen has already had its lights replaced, the classrooms in the gymnasium will follow suit in 2012.

Closing report

2.) Optimisation of existing biogas plants

Contractor: Novatech GmbH

12 plants were examined, evaluated and measures were suggested. In particular, improvements in heat utilisation were suggested. One plant was advised to construct a gas pipeline connecting it to a commercial consumer and operate a combined heat and power plant there. Since then, this idea has been realised. In a different case, plans to extract heat could not be implemented. Suggestions for other plans are still under review. Statements were also made concerning methane emmisions at the plants. Stoppage emissions will be avoided as it will soon become mandatory to retrofit gas flares. Ways of financing covers for residue storage tanks are being looked into. The GVV’s environmental bureau will evaluate which of the suggested measures can be implemented in the coming years.

Closing report

3.) Energy analyses of communal buildings

Contractor: Energiebüro 21

105 buildings were examined and all possible energy saving measures were calculated and evaluated. 154 profitable measures were identified.
If all measures were implemented the costs for Donaueschingen would be 4.06 million € and would save 2 million kWh annually. In Bräunlingen the figures are as follows: implementing the profitabe measures would cost 1.23 million € and would save 761,000 kWh annually. In Hüfingen the figures are as follows: implementing the profitabe measures would cost 959,000 € and would save 352,000 kWh annually.
The results will be included in an investigation lasting several years in which measures with payback times of less than 10 years will be prioritised initially. Implementation has already begun in Donaueschingen where heating pump have been replaced and hydraulic balancing has begun.

Closing report

4.) Energy balance sheet – local heating network

Contractor: K-Group, Munich

The GVV participated in the Department of the Environment and the company K-Group’s local heating network initiative, in order to raise the potential of new local heating networks. It created a energy balance sheet in order to identify suitable sites for local heating networks. Some industrial estates and areas with a high concentration of residential buildings emerged as promising locations.
Initial surveys with potential consumers failed to generate enough feedback to facilitate the installation of a local heating network. However, more surveys are planned.

5.) Energy optimisation sewage treatment plant

Contractor: Energiebüro 21

The treatment plant’s energy flows were extensively examined, documented and the potential for optimisation was assessed. In particular the potential to improve the ventilation and CHP unit was identified, which should subsequently be implemented.

Closing report

6.) Optimisation potential at pumping stations

Contractor: Hydro-Elektrik

Wastewater disposal and drinking water supply pumping stations are two of the largest communal electricity consumers. All ten of the GVV’s pumping stations and their components were subjected to detailed efficiency tests. The overall efficiency ranged between 40% and less than 10%.
Savings that could be achieved by renewing pumps, adjusting the pump capacity and managing the pumping process were determined. By investing 268,864€ annual savings of 61,979€ could be achieved. At the same time, there would be a saving of 205 tonnes of CO” annually (17.7%).

Closing report

7.) Linking businesses

Contractor: Baden-Württemberg’s climate protection and energy agency

The climate change and energy agency was charged with finding measures with which linking businesses could improve energy efficiency. The initial idea could not be put into practice as only a few businesses sent the required data.
Instead, by conducting inspections of the businesses it was hoped that internal energy saving solutions could be found. One business had already optimised most of its energy flows. Extensive energy saving possibilities were discovered in three businesses, in particular through heat recovery. The plan is to implement these changes. There was insufficient information on two businesses to conduct qualified assessments. Those businesses were advised to seek external help on the matter. An idea was developed to create an “energy efficiency network” which involved the persons responsible for energy matters within the businesses to meet up and exchange findings regularly. Currently 10 businesses take part in the “energy efficiency network”, which meets biannually.


Closing report

8.) Publicity campaign energy saving refurbishment in old buildings

Contractor: Institute for Environmental Research Tübingen

In the summer of 2010 the GVV Donaueschingen’s environmental bureau tasked the Institute for Environmental Research Tübingen, ufit, with conceptualising a campaign aimed at increasing the rate of refurbishment in the existing stock of old buildings in Bräunlingen, Donaueschingen and Hüfingen. ufit also supported the implementation of the campaign.

The focus of the campaign was to create a network of planners, consultants, tradesmen and financiers involved in the construction industry as well as a developers bonus sponsored by the network partners (named BA(A)R-BONUS, after the region).

In keeping with the motto “My HOUSE has a FUTURE” the campaign started in November 2010. By the end of February 2011 45 partners hat joined the network , including about 25 of the region’s workshops, 15 planning and environmental consultancies and the local banks. Another partner is the Sto AG company as a manufacturer and the Stark company as a regional builder’s merchant.

In all, 65 developers were registered for the campaign and will implement 77 measures in 2011 and plan 50 more. As many more measures were implemented outside of the campaign, it is safe to assume that 300 energy saving measures were implemented.

Closing report

9.) Energy saving measure evaluation

Contractor: Energiebüro 21

16 energy saving measures carried out over the last few years in public buildings were examined in order to determine whether the predicted savings, both energetic and financial, occurred. The results show that in most cases the energy savings met or exceeded expectations. This was mirrored in the manageable payback period.

Fundamentally the evaluation proved that the energy saving investigation are worthwhile and that more measures should be implemented rapidly.#

Closing reports

10.) Audit of energy saving potential in IT equipment

Contractor: ratio IT

Five computer networks in town halls and schools totaling 240 PCs were examined for their energy saving potential. CITEM software as used to analyse and evaluate the activities of the network’s computers.
The following five low-cost energy saving measures were recommended:
–    activating the energy saving mode “switch off screen and hard drive”
–    master-slave sockets at workstations
–    timer switches for printers
–    user feedback concerning patterns of use
Implementing these measures could reduce electricity bills by 46% or 6400€ a year. More savings are possible if future purchases are consistently involve low-energy alternatives. This applies to individual devices as well as the network’s structure (thin clients rather than fat clients). This could lead to further savings of 4000€ a year and would reduce electricity consumption to 20% of what it is now. Cooling systems which use outside air should be implemented in server rooms as this could significantly reduce the need for energy-intensive technical cooling systems.

Closing report


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