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The PYSOLO project

Combining Concentrated Solar Power and Pyrolysis

In July 2023, the Horizon Europe Project PYSOLO (PYrolysis of biomass by concentrated SOLar pOwer) was officially launched and will be up and running for the next four years. The project aims to prepare the ground for a novel game-changing and fully renewable process combining concentrated solar power and biomass pyrolysis.

Electrification, decarbonisation and defossilisation of the chemical industry

The EU’s chemical industry urgently needs to abstain from fossil resources by switching to renewable carbon. The energy and heat needed to run industrial processes have to derive from renewable sources like wind power and solar energy. However, this decarbonisation via electrification of the industry is not enough to meet the climate Paris-COP21 targets. Also, the feedstock for chemicals and materials has to come from renewable sources like recycling, CO₂ capture and biomass.

PYSOLO offers a solution both for decarbonisation of the transport sector and industrial processes, and defossilisation of the chemical industry. This will be done by combining concentrated solar power (CSP), renewable energy sources (sun and wind) and biomass (wood) pyrolysis.

CSP is a technology in which sunlight is captured by several movable mirrors, directed and concentrated onto a solar receiver. In particle receivers, the technology adopted in PYSOLO, the concentrated sunlight is used to heat up solid particles to high temperatures, whose heat can be used directly to drive downstream industrial processes, to produce electricity or can be stored for subsequent use. By making use of CSP for the heat supply necessary for the pyrolysis process and by upscaling two key units (the particle receiver and the pyrolizer), the PYSOLO technology will deliver valuable products from wood (bio-oil, pyrolysis gas and biochar). These products will serve for both energy and non-energy uses, e.g. biofuels for the transport sector and biochar for agricultural purposes (as fertiliser).

Operational flexibility to run in self-mode and to balance the electric grid

A major innovation of the PYSOLO technology is that the pyrolysis process can be operated in different modes: it can run with CSP during sunny hours, or by burning pyrogas and biochar when heat from CSP (produced or stored) is not sufficient. The PYSOLO technology can also provide balancing services to the electric grid: if required, the generated pyrogas can be converted into electricity and fed into the electric grid. On the flipside, when, low-cost excess electricity from the grid is available (e.g. from wind or PV), it can be converted in high temperature thermal energy to maintain the pyrolysis process.

Solar heat for negative CO₂ emissions

In comparison to conventional pyrolysis, in which char and pyrogas are always burnt to run the process, the PYSOLO technology comes along with economic and environmental benefits. Thanks to the use of solar heat in the biomass pyrolysis process the production of valuable products such as bio-oil, biochar and pyrolysis gas can be maximised. Simultaneously, the associated CO₂ emissions will be minimised due to the use of renewable energy and non-fossil feedstock. Thanks to the biochar production, essentially solid carbon, the PYSOLO process represents a net negative CO2 emissions process.

Joint forces for innovation

PYSOLO was granted for about 5 Mio € to a consortium combining the expertise of nine partners from four EU countries under the lead of Politecnico di Milano (IT). These are the French L’Institut National de l’Environnement Industriel et des Risques – INERIS, the German Deutsches Zentrum für Luft- und Raumfahrt e.V. and the nova-Institut für politische und ökologische Innovation GmbH, three partners from Italy, Consorzio per la Ricerca e la Dimostrazione sulle Energie Rinnovabili, Politecnico di Torino and EU CORE Consulting SRL, as well as the Spanish Agencia Estatal Consejo Superior de Investigaciones Científicas and the Consorci Centre de Ciencia I Tecnologia Forestal de Catalunya.

Project coordinator

Project partners


nova-Institute for Ecology and Innovation

Verena Kuhlmann
[email protected]

Anke Schwarzenberger
[email protected]


Funded by the European Union. Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or CINEA. Neither the European Union nor the granting authority can be held responsible for them.