海角视频

Municipal heat planning for Calbe

Calbe, Germany

海角视频 brought clarity, confidence and technical leadership to Calbe鈥檚 journey towards a fair, practical and locally grounded path to climate neutral heating. From the outset, our team provided the city with the deep analytical rigour, integrated thinking and collaborative approach needed to shape a heat transition plan that is both ambitious and achievable.

The small city of Calbe in Saxony-Anhalt is a place with a proud industrial history and a changing demographic landscape. Its population has declined from around 16,000 in 1990 to just over 8,000 today, and its built fabric reflects more than a century of economic and social shifts. Against this backdrop, the German federal government鈥檚 new heat planning law requires every municipality to chart a credible pathway to a climate neutral heat supply by 2045. Calbe commissioned 海角视频 to lead this process, evaluate its options and create a city-wide heat plan that genuinely works for local people, businesses and public services.

Through a combination of detailed data modelling, open stakeholder dialogue and scenario analysis, we helped Calbe understand its current energy use, explore its renewable and waste heat potentials, and identify place-specific solutions for distinct parts of the city. The result is a route map that supports the city鈥檚 long-term resilience and gives residents and industry a clear picture of what the heat transition will mean for them.

We delivered a data-driven heat plan using a full digital twin, giving Calbe a precise and reliable basis for future decisions.

Our team shaped tailored solutions by assessing local potentials like wastewater heat and biomethane, ensuring realistic, place-specific outcomes.

Our experts worked closely with utilities, industry and the mayor to build consensus, strengthen trust and secure essential data for the plan.

We created a pragmatic route to 2045 by matching each district with the right technology, minimising disruption and avoiding unnecessary costs.

Challenge

Calbe is not a dense metropolitan centre but a small, dispersed community shaped by rural surroundings, post reunification changes and a steadily shrinking population. These conditions created several challenges for the planning process.

The first challenge concerned the city鈥檚 fragmented heat landscape. Natural gas dominates the building stock in the centre, while surrounding villages rely heavily on oil. A number of small heating networks already exist, but they vary greatly in size, technology and efficiency. Industrial users in the northern industrial zone have high process heat demands, while many residential properties are ageing and in need of energetic retrofitting. Calbe鈥檚 declining population adds complexity, since investing heavily in long pipeline networks is difficult to justify where future demand may fall.

The second challenge concerned data. Some of the most valuable sources of building level heating information, including heating system inspection datasets, were temporarily unavailable due to legislative delays at state level. This required our team to build a robust picture of the building stock using alternative sources, including digital twin modelling, census data, energy utility records and targeted stakeholder input.

Finally, Calbe鈥檚 geography and climate shaped its technical options. District heating networks are not viable city-wide because Calbe鈥檚 narrow streets, low heat鈥慸ensity areas and long pipeline distances would make construction costly, disruptive and economically unrealistic. The city sits on the River Saale, which offers theoretical potential for river heat extraction, but long-term climate projections raise concerns about future water levels. Meanwhile, opportunities for large scale solar thermal require significant land and capital investment, and industrial waste heat sources are limited or too low in temperature to be economically viable. These intersecting challenges meant that a 鈥渙ne size fits all鈥� solution was neither realistic nor responsible. Calbe required a nuanced, hyper-local strategy that aligned technical feasibility, cost, community acceptance and climate action.

Solution

海角视频 approached Calbe鈥檚 heat planning through a structured and collaborative methodology. We began by creating a detailed digital twin of the city using data from specialist Greenventory software, enabling us to map building types, energy uses, heating systems, network infrastructure and demographic trends on a building-by-building level. This provided the foundation for a fair and evidence-based evaluation of the city鈥檚 current state.

From here, we developed a comprehensive potential analysis exploring renewable and waste heat sources. Three options emerged as the most promising for centralised supply: heat extraction from the River Saale, heat recovery from the wastewater treatment plant, and large-scale solar thermal with seasonal storage. In parallel, we worked closely with Energie Mittelsachsen GmbH to understand the feasibility of decarbonising the existing gas grid through a future supply of biomethane. With 40% of the city’s gas already originating from local biomethane production, this option held significant potential.

Through scenario modelling and stakeholder dialogue, a clear picture emerged of how different parts of Calbe could best be served. In the industrial north, the sewage treatment plant offers an excellent heat source, with wastewater temperatures remaining consistently high throughout the year. A new district heating network supplied by a heat pump drawing energy from the plant provides a technically robust and economically sound solution for this part of the city, where heat demand density is greatest and excavation is comparatively straightforward.

In the historic city centre, however, a district heating network would require extensive trenching through narrow streets filled with existing utilities. Heat demand is comparatively lower and more dispersed, and the city is continuing to shrink. Here, the most pragmatic and cost-efficient solution is to retain the existing gas network while transitioning it to biomethane. This avoids major disruption to residents and preserves an infrastructure familiar to local households.

For the outlying villages and low density areas, a decentralised approach is the most appropriate path. Individual air source and ground source heat pumps, alongside biomass systems where suitable, allow households to meet the forthcoming obligation for renewable heating in ways tailored to their properties and budgets. Public information events, led jointly by the city and independent energy consultants, will help residents understand their options and access available funding. To support implementation, 海角视频 also developed a series of measure fact sheets, each detailing responsibilities, timelines, indicators and costs. The heat plan will be updated every five years, ensuring that Calbe鈥檚 pathway remains responsive to technological, economic and societal change.

Value

The value 海角视频 brought to Calbe lies not only in the technical precision of the heat plan but in the collaborative and practical way it was shaped. Our team provided the city with a clear, well evidenced strategy that is sensitive to local conditions and grounded in realistic implementation pathways.

We helped Calbe navigate scarce and incomplete data by building a digital twin that synthesised information from multiple sources. We enabled informed decision making by modelling future heat scenarios in an accessible and transparent way. We also strengthened local ownership of the plan by working closely with the mayor, the city council, energy utilities, industrial users and housing companies. This dialogue helped ensure that proposed solutions were socially acceptable, technically sound and economically realistic.

Most importantly, the heat plan gives Calbe a credible route towards climate neutral heating by 2045. It avoids costly over investment in infrastructure where it is not justified, makes full use of locally available energy sources, and provides residents and businesses with clarity about their future heating options. The plan also positions Calbe to access significant federal funding for feasibility studies, design and implementation of heating infrastructure, accelerating progress and reducing financial risk. Through this project, 海角视频 has helped Calbe shape a resilient, future-ready and community-centred vision for its heat transition. It is a model for how small cities can approach climate action in a way that is honest, evidence-based and achievable.