Krieg & Fischer Ingenieure GmbH

Krieg & Fischer Ingenieure GmbH is a planning office that focuses on the planning and construction of tailor-made biogas plants.

The engineering office Krieg & Fischer Ingenieure GmbH is globally active in the biogas sector. Alongside the design, planning, approval planning (building regulations, BImSchG), execution planning, preparation and involvement in the awarding of the contract, overall management of the construction site and commissioning of the biogas plants, we also offer consulting services, prepare surveys, expert reports, insurance reports, studies and plant optimization measures, inspect technical safety equipment and provide operator services and training courses – simply everything required in the biogas sector.

This includes simple farm-scale biogas plants for fermenting slurry, stable manure, energy crops and agricultural waste and also complex, multi-stage, industrial fermentation technologies for waste from the food industry, food leftover fermentation or organic waste fermentation plants.

We have particular expertise in the digestion of stillage from bioethanol production and residual materials from the sugar industry such as sugar beet pulp and vinasse.


Tailor-made Solutions

Krieg & Fischer Ingenieure GmbH is your one-stop planning of biogas plants, from concept to commissioning, customized, competent, innovative and independent.

We do not only possess experience with agricultural substrates such as slurry, manure, straw and other agricultural crop residue or various energy crops such as grass silage or maize silage but also with commercial waste such as kitchen waste, food leftovers, canteen waste, waste from the food industry, out-of-date foodstuffs from the retail trade, organic waste from industries such as fruit residue or marc and market waste such as fruit and vegetable residues or municipal organic waste such as organic waste bins or green waste etc. to name just a few.

We plan biogas plants that are adapted to the substrate and the local conditions. Our expertise stretches from substrate-specific pretreatment including, where necessary, the removal of unwanted materials or using additional hygiene and further conditioning steps, one and two-stage fermentation processes, mesophilic and thermophilic fermentation and wet and dry fermentation plants. Our fermenters are often high fermenters delivering optimal agitating properties to provide good value for money but also include flat fermenters with a gas storage roof or a plug-type flow system.


International Expertise

Krieg & Fischer Ingenieure GmbH shares project experience in biogas in more than 20 countries, collaboration with reliable partners in 12 countries. We have more than 150 reference biogas plants all over the world, from 45 kWel to 8.3 MWel and experience with a wide range of substrate.

Together with our partners we have created a global network, and are perfectly capable of constructing biogas plants which are adapted to the specificities of your country. Our local partners undertake provision of the services rendered in your country:

  • Our partner is there to offer you assistance at local level and drives customer acquisition within the country.
  • Our partner is familiar with your country’s customs, as well as its specific laws and regulations, and is able to provide you with information and advice in your own language.
  • Our partner supervises the construction of your plant, in conjunction with our engineers


Over 30 years of experience

We offer training courses to operators of biogas plants to enable them to continuously expand their expertise and also exchange knowledge amongst one another. We thus offer a platform for the transfer of knowledge and experience between the fields of research and teaching, operation and us as the planning engineering office.

We attach great importance to plant safety and occupational safety. Plant safety is an important factor in the planning, construction and operation of biogas plants.

The operation of a biogas plant requires owners to meet various legal, technical, biological and organisational requirements and possess relevant knowledge. Krieg & Fischer Ingenieure GmbH offers you a comprehensive range of services to support your operation. The goal is to reduce your workload and increase the plant safety and occupational safety of your biogas plant.

To know more about our services, please visit the Krieg & Fischer Ingenieure GmbH website.


  • Biogas Engineering and Consulting
  • Testing and Monitoring

Contact Krieg & Fischer Ingenieure GmbH

Contact me