In our 10-year history, sustainserv has played a critical role in fostering public-private partnerships, which are collaborations between the academic, corporate, and public sector to facilitate knowledge exchange and technology transfer for the greater good of society. One area particularly well-suited to this approach is regional energy management. As a new member of the sustainserv team, I wanted to share some of my most interesting and relevant past experiences, which may be broadly applicable to your situation, whether you operate in the corporate, institutional, or government sector.
Energy planning and management have increasingly become a challenging task due to concerns over climate change, cost containment, and an over-reliance on politically unstable regions that produce fossil fuels. Renewable energy production can serve to address many of these issues. Locally-generated renewable energy can also add economic value to a region (for example through local residents and businesses selling excess energy generated, supporting local companies which install and maintain the renewable energy equipment, and retaining the revenues locally rather than exporting it), stabilize the electricity grid, and reduce negative impacts on the local and global environment. However, making such a leap requires a fundamental shift in how energy supply is planned and implemented. As illustrated by the rapid rise in the number of wind turbines in Denmark, the deployment of renewable energy moves us away from the model of relying on a few large power plants to developing a network of many small and decentralized facilities.
Contrary to common belief, renewable resources are available where most of the energy is needed: in urban areas. Despite first impressions, even densely populated cities have a lot of space available to produce renewable energy. These untapped resources include derelict urban terrain, building roofs and facades, waterways and wastewater, ambient air and exhaust air from buildings, as well as the very ground the city is built upon. Some options which are suitable for the urban environment* are listed below:
- Photovoltaics and solar collectors for hot water may be installed on building roofs and facades.
- Small-scale hydropower can be generated from rivers, canals and pipes.
- Shallow geothermal heat can be tapped with ground source heat pumps.
- Ambient air and exhaust air can easily be exploited to provide supplemental indoor heating for buildings.
- Thermal energy can be extracted from wastewater already in the building, from the public sewer system or from the cleaned wastewater after sewage treatment.
- Biomass, especially biowaste, can be converted into power and heat. Co-generation of heat and power increases the efficiency of the system.

Examples of renewables deployed in urban areas. Left: South-facing building facades can be used for photovoltaics. Right: Derelict urban terrain temporarily used for biomass production.
In order to capitalize on these resources, a well-coordinated energy plan is required. In general, decentralized heat generation should be a higher priority than electricity production (heat cannot be efficiently transported over long distances, therefore the demand has to be met locally). But this doesn’t mean that all roofs should be covered with solar collectors for hot water. If, for example, a certain type of building is suitable for capturing heat from wastewater, the available space on roofs and facades can be used for photovoltaic panels (which also produce the electricity for the heat pumps). This example illustrates that successful energy planning is holistic in its approach, and one way to support this process is by conducting an analysis at the city or regional level. To optimize energy performance, one must clarify which combination of technologies will provide the right energy at the right place. Only with a well-coordinated mix of facilities can true energetic potential of an area can be maximized.
An energy balance, which summarizes the potential for biomass, solar, and/or geothermal heat, is not able to provide this information. A spatial analysis is needed to integrate and map the energy production potential and compare it with local energy demand. One simple approach is to divide the area into Urban Spatial Types (such as “historic center,” “business districts,” “residential spaces,” etc.), which have typical energy potential profiles and a typical energy demand per square meter (see the reference at the end of the text for more details). Below, a map with the Urban Spatial Types (USTs) of the canton of Basel-Stadt (Switzerland) is shown:

Figure: Energy profile mapping of the canton of Basel-Stadt (Switzerland). Each color shows a different Urban Spatial Type with typical renewable energy production potentials and a typical energy demand per square meter.
For these USTs, the long-term energy demand is assessed over a timeframe of 20-40 years. Thereafter, the corresponding potential to produce renewable energy is determined. Based on this, the ratio of renewable energy produced to energy needed is calculated for both thermal and electric energy sources. Finally, the outcome is visualized by means of a geographical information system (GIS). The resulting map is applied to optimize the renewable energy supply of the city by including existing energy infrastructure and planning additional supply options.*
Energy mapping has been carried out in cities and regions in Germany, Switzerland, Austria and Liechtenstein. If the use of renewables is well planned, cities are able to meet most, if not all, of their energy demand with renewable energy generation in their own area:

Figure: Maximal energy self-sufficiency of investigated cities/regions in Germany, Switzerland, Austria and Liechtenstein. The larger the circle, the higher the population density.
Regions with a lower population density have a higher likelihood of meeting energy demand with their own renewable resources. However, in some cases even densely populated cities like Hamburg (Germany) can actually produce more energy than they need (and export it). Thus, the use of renewables is not only a means to counteract global warming, but it can also provide a substantial economic benefit for a region.
In closing, whether you are an international company with facilities spread across a given region or the globe, or you are a member of a municipal planning group, you may find that either you or your stakeholders are seeking ways to prioritize and optimize the energy profile your built environment. A simplified approach to energy mapping may be an important process to include in your planning toolkit.
*Cited from: Dieter Genske, Lars Porsche, Ariane Ruff (2009). Urban Energy Potentials: A Step Towards the Use of 100% Renewable Energies, p. 251-262. Peter Droege (Ed.), 100% Renewable – Energy Autonomy in Action, ISBN: 978-1-84407-718-2.
Map and Figures: Energie-Klima-Plan GmbH, seecon gmbh, University of Applied Sciences Nordhausen, University of Liechtenstein
Tags: Nicht getaggt









In the past few years, we have witnessed a wholesale shift whereby businesses in just about every sector realize that sustainability is a topic that they must engage with in a credible and transparent manner. In many cases, it has become a basic expectation in the marketplace.


