Our energy systems: “residue refiners”

With our resource-saving energy systems, you round off your value chain sustainably and economically. Whether prepared roadside greenery, residual forest wood from thinning, beetle wood, nut shells and waste wood or residual fractions produced in the sawmill: our systems convert residual materials into valuable energy. Thanks to the robust construction and innovative system technology, a wide variety of input materials in the form of wood chips can be used as an energy source. This also applies to high-calorie plastic waste, which is usually landfilled without any further energy yield and can be added to our plants after approval.

Biomass power plant from Spanner Re² can be operated with:

  • wood chips according to DIN ISO 17225-1*
  • briquettes, Diameter 30 mm
  • pellets, also industrial pellets 


Which quality is for biomass gasification is necessary?

  • Water content <13%
  • Maximum fines content (<4 mm grain size) 30%


Fuel of the future: residues

As a full-service supplier of residue-based combined heat and power plants, we offer you perfectly compatible system components. This allows you to use wood as a regional energy source to 100%, generate energy independently of fossil fuels and, on top of that, generate an additional lucrative source of income, for example through contract drying. Our wood-based CHP plants are not only efficient, but are also characterized by a high degree of fuel flexibility. Here you can see some of the possibilities for increasing added value with a wide variety of residual materials:


Waldrestholz zur Energieerzeugung nutzenWaldrestholz-Hackschnitzel Energie erzeugen 

Energy from forest wood

Not all wood that is obtained from forest care is suitable for material use. It would be a shame to use the wood only for heat generation. A high-quality energy source can be obtained from residual forest wood by processing it. Spanner Re² wood gasifiers generate from residual forest wood according to the principle of combined heat and power (CHP) heat and electricity.

Energy generated from roadside greenery

Johann Huber has been operating a wood gasifier from Re² since 2012. He only uses processed roadside greenery as fuel, which he obtains free of charge from the region.

strassenbegleitgruenHackschnitzel aus Straßenbegleitgrün zur Energieerzeugung

Energy generated from industrial pallets, fruit boxes

The use of industrial waste wood is also possible with a wood gasifier from Re². A customer has been operating his wood gasifier with wood chips from processed industrial pallets and fruit crates since 2016. He receives the material free of charge. The waste wood is processed into wood chips using a chipper.
processed into wood chips. Possible impurities such as nails are sorted out using a metal separator.

Aus Paletten Energie erzeugenPaletten zu Hackschnitzel schreddern

Generating energy from beech veneer offcuts with wood gasifier technology

Hermann Speerschneider KG is a family business for the production of veneer and plywood. Any sawn timber or waste wood is processed into shredded wood chips using a shredder. The HKA 70 wood-fired power plant, which went into operation in 2020, has been generating electricity and heat from waste wood ever since.

Schnittholzreste zur EnergieHackschnitzel aus Schnittholz

Energy from shavings, sanding dust or sawdust

Don't leave any wood unused: We offer you the option of processing chips, dust or sawdust with our briquetting press. This allows you to turn your waste material into a valuable energy source and increase your added value. The briquettes are approx. 20 mm long and around 30 mm in diameter.


Benefits that wood briquetting offers you:

  • Optimum added value
  • CO2-neutral, cost-effective fuel
  • High energy density
  • Good flow and metering properties of the briquettes
  • High storage stability due to compact pressing
  • Space-saving
  • Easy transportation


Use exotic residual wood/waste such as coconut or nutshells to generate energy

Electricity and heat can be generated not only from domestic wood waste. Residual material is also produced from various types of wood worldwide during processing, which can be used in Re² biomass power plants. For example macadamia shells, almond shells or coconut shells are used in biomass power plants from Re².

 Aus Kokosnussschalen Energie erzeugen

Plastic waste for energy generation

For several years, Re² has been working with renowned research institutes to test plastic waste from industrial processes such as POM, PP, PE and PET as a fuel. For this purpose, around 50% of the plastic waste is mixed with wood chips and used to generate energy. This represents enormous potential, as high-calorific plastic waste in particular cannot be recycled and is generally incinerated or sent to landfill without any further energy extraction.

 kunststoffabfallkunststoffabfaelle energieerzeugung

*   Wood chips according to DIN ISO 17225-1, size: P31S, fines content: F10, water content: M10, ash content: A1.0
** Fuel lexicon: Fine fraction: The fine fraction in particular contains minerals that contribute to slag formation. The higher the fines content, the more coal dust is discharged via the ash. Bark content: This can lead to an increase in slag formation, but can also increase the achievable output. Water content: The content has a significant influence on the temperatures that can be achieved and therefore on the tar content of the product gases produced. Wood species: Differences in the resin content or tannic acid content can have an influence on the gas quality as well as on the condensates or intermediate products produced and their influence on the system technology. Wood age: The fresher the wood is, the more volatile components are contained in the wood and can be converted into product gas. Old wood can therefore lead to an increase in fuel consumption, a deterioration in gas quality and an increase in the proportion of residual material.
Errors and changes excepted.


Do you have any questions?

Get in touch with us.
We look forward to hearing from you.

Contact us

  • Spanner Re² GmbH
    Niederfeldstr. 38
    D - 84088 Neufahrn i. NB
  • This email address is being protected from spambots. You need JavaScript enabled to view it.
  • +49 8773 70798-0

Service & Spareparts

Do you have a problem with your Biomass power plant or pellet heating systems and need technical help?

Contact our service team