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Jena integrated energy and heating concept 2050

EnEff:Wärme - Forschung für energieeffiziente Wärme- und Kältenetze

District heating pipes in Jena

© Stadtwerke Energie Jena-Pößneck

Settlement summary

Project status Projektstatus: Phase 1Concept
Location of local community Jena, 07745 Jena, Jena, Thüringen
Settlement in figures Area: 114 km²; population: 106,000
Developer, organizer Stadtwerke Energie Jena-Pößneck GmbH
Network operator Stadtwerke Energie Jena-Pößneck GmbH
Generation CCPP plant with CHP (not owned by the Stadtwerke Energie Jena-Pößneck municipal utility company), 2 biogas-CHP plants
Network length district heating: 118 km; Gas: 471 km km
Heat customer, cooling energy customer private buildings, public facilities, industrial enterprises
Project themes

Project description

The town of Jena lies in the middle of the Saale Valley in eastern Thuringia, extending for almost 15 km along the Saale River. More than 106,000 people live in the university town, whereby almost one quarter of the population is made up of students at Friedrich Schiller University and Jena University of Applied Sciences. In addition the town is a thriving business centre thanks to numerous non-university research institutions, a technology and innovation park, several internationally active companies as well as a diverse range of start-up or spin-off technology companies. Although Jena has also experienced a drop in its population since 1990, this development is far less dramatic than in other towns in eastern Germany. At the moment the number of inhabitants is stagnating with a slight trend upwards, which means that the demographic conditions can be described as stable. In terms of emissions, the town’s position in the valley leads to a problematic exchange of air with a high risk of inversion weather situations. The heat supply in Jena is therefore largely based on district heat and natural gas as grid-bound energy sources. The district heating network is characterised by the town’s elongated position in the valley with central heat injection from the Jena South CHP plant, which is owned by E.ON Thüringer Energie AG. Located in the southern part of the municipal area, this combined cycle power plant (CCPP) with three gas and steam turbines currently has a heat-led operation. A unique feature is the monocentrically built district heating network. This uses heat that is generated at only one point in a plant that is not owned by the network operator and from 2024 will no longer be available for providing district heating.

The community

In Jena there is considerable cooperation between the local authority and the municipal utility company with a joint coordination of energy policies. There is also a joint, long-term commitment for providing energy consultation and promoting civic projects. Jena is also an eea Gold municipality with certified energy management. In addition to its climate protection activities, the town is also developing a climate adaptation strategy (JenKAS) and is taking part with this in the ExWoSt “Urban Strategies on Climate Change” model project along with eight other German cities. Each year, the Klimaschutzstiftung Jena-Thüringen set up by the municipal utility company in 2003 holds a competition to award particularly impressive projects from children and young people along with the corresponding funding bodies. There are also further initiatives concerned with, for example, increasing the number of PV systems, advising households on energy efficiency and promoting participation in the Bio-energy Region competition project conducted by the Rural District of Saale-Holzland.

Project goals, Strategic tasks

The aim is to develop an integrated energy and heating concept that links centralised, efficient and renewable energy sources for heating, gas and electricity with end customers, includes the development of decentralised sources, balances out heat consumption and provision structures and therefore makes a substantial and cost-effective contribution to reducing CO2 and preserving resources. The main concept in this regard is to develop a communal energy and heat network system that is open to feed-ins and development, can flexibly implement the current technical, economic and organisational requirements and can respond to future challenges. It shall be investigated whether it makes sense to replace the current monocentric district heating generation with a structure that supports several plants and sites and, for example, utilises waste heat. The timeline for the investigation is up to 2050. In addition to analysing grid development options, it will also be concerned with identifying properties and districts that, because of the requirement situation, can no longer be centrally supplied in an economic manner from a certain point in time. Stand-alone solutions with mini- and micro-CHP systems would offer an alternative in this regard.

An integrated, sustainable and future-proof concept for energy and heating should enable not only flexible adaptation in accordance with future energy demand but also active shaping and control on the requirement side. This can occur, for example, through prioritising or assessing which districts should be earmarked for energy-based building refurbishment, by actively involving affected players and by closely communicating with all involved stakeholders as part of innovative participation and funding models. This would enable long-term, dedicated planning and the associated investment decisions would be made on a secured basis. This heating network system is being embedded in an overall strategy for energy efficiency and climate protection in Jena, which runs until 2050. The strategy also covers the reduction of the total energy requirement in the town of Jena by 30% (relative to 2011), a participative, user-related approach for increasing acceptance and a bundle of coordinated measures (organisational, financial and participative models) for its implementation under flexible framework conditions.

Work programme

The project is divided into a total of 8 sub-modules:

  • Module 1 largely includes the current status analysis with an evaluation of existing investigations and, as a result, will provide an overall picture of the current energy and heating situation in Jena with all parameters.
  • Modules 2, 3 and 4 are closely coordinated with one another and, as a substantial component of the project, include the development of projections and scenarios for providing energy and heating to Jena in 2050.
  • Module 5 is concerned with the actual concept and strategy development for supplying energy and heat to Jena in 2050.
  • For this purpose two different target systems will be developed and the corresponding development paths will be organised in priority/action plans/generation and distribution structures.
  • The detailed planning will take place in Module 6 with the development of specific technical and non-technical measures and corresponding implementation lists.
  • Module 7 is used for preparing and planning the future implementation as part of the initial, exemplary funding measures with demonstration character (focus on 1-2 urban districts, if need be sub-networks).
  • In Module 8, indicators will be developed for monitoring the future implementation and achievement of objectives.