Project meeting of STEP at the site of the company ATS - Agro Trading & Solutions in Hardegsen (Photo: DBFZ)

System integration System studies

Project ID 03KB129

OptiSys - Optimal share and contribution of bioenergy in the energy system and in coupled electricity and CHP-systems in Germany - system oriented evaluation of the cross-sector provision of flexibility of bioenergy plants through coupled electricity and heat generation (incl. e-mobility)

Biogas olant (Photo: Martin Dotzauer, DBFZ)


  • 01.09.2017 – 31.08.2019


Universität Stuttgart
Institute of Energy Economics and Rational Energy Use
Heßbrühlstraße 49a
70565 Stuttgart

Dr. Ludger Eltrop – project leader
Telephone: +49-(0)711 685 87816

MSc. Sylvio Nagel – former project member

Dr. Marlies Härdtlein – former project member


03KB129B - Technical University Ingolstadt
  • Address:
  • Technical University Ingolstadt
    Institute of new Energy Systems (InES)
    Esplanade 10
    85049 Ingolstadt
  • Contact:
  • Prof. Dr.-Ing. Uwe Holzhammer – project leader
    Telephone: +49 841 9348-5025

    Dr. Matthias Philipp – former project member

03KB129C - Dialogik - non-profit institute for communication and cooperation research

Associated partners

Cooperation partners



Final report only available in german.


The successive extension of the use of renewable energy in the German energy transition forces a restructuring of the entire energy system. This is connected with a set of new, innovative technologies and plant operation procedures as well as the necessity to shift the plant park more towards a flexible operation (demand response, storage, feed-in management, P2X, flexible conventional power plants, import/export; etc.). In the project, the interaction of theses flexibility options is analysed in detail from a systems point of view. Particularly the cost optimal integration of bioenergy into the energy system is further investigated and evaluated. 


The overall project aim is to make the use of bioenergy in future, coupled electricity and combined heat and power systems more specific in Germany. Therefore, the defined quantity framework takes into account the electricity sector, but also the use of biomass in heat and transportation sector and the relations in-between. The interaction of bioenergy with other flexibility options is considered, as well as different technical solutions for the energy supply by biomass in the system is evaluated.


IER, University Stuttgart
For this purpose, the relevant spectrum of flexible bioenergy technologies (biogas, biomass CHP, bio-methane CHP, etc.) is compared with other technology and flexibility options (primarily demand response, storage, feed-in management, power-to-heat, flexible conventional power plants). For the target year 2050 and the support years, 2030 and 2040, cost-optimal components of the bioenergy for the energy supply system are derived, taking into account energy and climate-related objectives. Furthermore, the system contribution respectively the influence of different technological characteristics, such as flexibility, CHP and availability of bioenergy plants, is outlined and assessed. The procedure and the observed system effects are documented in a methodological manual "Bioenergy as a flexibility option in the energy system" and thus a broad transfer of knowledge is ensured.

InES, Technische Hochschule Ingolstadt
AP1: Review and discussion of energy system repots and current bioenergy research projects for the years 2030, 2040 and 2050. The topics of flexible biomass, innovative CHP designs in combination with renewable energies and sectoral coupling of electricity in the field of mobility. The consortium defines on basis of the data the framework of the scenarios.

AP2: Technical and economcial parameters of the investigated technologies are investigated. Scope is to develop technology fact sheets of biogas plants with biogas storage, biomass power plants, bio methane processing and innovative CHP in combination with renewable energies. 

AP4: Evaluation of the robustness and sensitivity analysis. Furthermore, the simulation results are interpreted and set in relation with the technical and economic input data. The result of the work will be used for a critical discussion between the project partners.

AP5: Publication of the technology fact sheets as open data in the methodological manual "Bioenergy as a flexibility option in the energy system". This shows the boundary conditions of the scenarios that have strong influence on the results. Throughout publication third parties is given the opportunity to reproduce the methodology. The simulation results and the independencies of the flexibility options are displayed and discussed.

AP6: Four project workshops are planned with an expert committee accompanying the project. The workshops are organized as round tables and aligned to the milestones of the work packages. The expert committee consists of actors from the fields of bioenergy, energy system analysis and energy markets. This is to ensure that scenarios and results of completed and ongoing studies are taken into account adequately and that the results obtained in the project and the methodological handbook are developed and elaborated transparently.


IER, University Stuttgart

  • Scenarios of the electricity, the CHP heat supply and the mobility development
  • Energy system modelling and system effects of bioenergy within the energy system
  • Development of the methodological handbook to adequately cover the system effects of bioenergy

InES, Technische Hochschule Ingolstadt

  • Scenarios of the electricity, the CHP heat supply and the mobility development with focus on review of existing research
  • Technology fact sheets for bio energy
  • Development of the methodological handbook to adequately cover the system effects of bioenergy


  • Planning, organization, implementation and documentation of the project workshops for transparent and practice-oriented project processing


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