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Pyrolysis can be used to produce renewable energy and offset greenhouse gas emissions. While the biopower potential of pyrolysis has been widely analyzed, agronomic and environmental benefits under competing pyrolysis modes have not been investigated and compared. This study reviews the properties and characteristics of major pyrolysis technologies including fast, intermediate, slow, gasification, and torrefaction, and then investigates and compares their biopower potential and the biochar-induced agronomic and environmental benefits so that the fundamental figures for future large-scale biopower development can be explored. The results indicate that (1) revenues from energy sale generally outweigh the agronomic and environmental benefits, but the extent depends on the commodity price and emission price; (2) if biochar is not used as an energy source, 10.58%–26.73% of biopower generation is decreased for fast pyrolysis and a 90%–97.44% decrease would occur for torrefaction; (3) biochar-induced agronomic benefits and emission offsets from torrefaction can greatly recover the loss of energy sales; and (4) with torrefaction the emission offset can be up to 2.82–3.19 tonnes carbon dioxide, on a per tonne biomass basis. We also discuss how biochar application might alleviate surface water eutrophication and groundwater pollution. • Mitigation potential of torrefaction is up to 3.19 MT per ton feedstock. • Without the use of biochar, power generation of fast pyrolysis declines by 26.73%. • Torrefaction benefits agronomic mostly but yields least biopower. • Changes in energy and emission prices would cause technology transitions. • Slow pyrolysis balances biopower production and mitigation effects. [ABSTRACT FROM AUTHOR]

European energy landscape is currently undergoing significant changes shifting from fossil to renewable energy sources. Biomass will continue to play a significant role in decarbonisation efforts. As a pioneer in climate change mitigation, the European Union (EU) can also greatly benefit not only from the wide deployment of bioenergy, but also from Bioenergy coupled with Carbon Capture and Utilization (BECCU). BECCU is a key enabling technology for the energy transition addressing simultaneously the renewable feedstock-based circular economy. Biomass utilization in existing and future power and heat applications addresses the decarbonisation of power and heat sector, while the integration of CO 2 -utilization technologies in these plants enables the valorisation of waste streams via conversion to fuels and chemicals. The current status of bioenergy deployment in Europe is reported, along with a review of the main BECCU technologies and a special focus on valuable recycled bio–CO 2 –derived transport fuels. BECCU enables the decarbonisation of power, heat and transport sector leading to a net zero or even negative emission energy system by 2050. • Review of regulatory framework for Bioenergy with Carbon Capture and Utilization. • Alternative configurations in biorefinery applications are presented. • Implementation of BECCU in combined heat and power plants and in biofuel production. • Applications, carbon capture costs and technology readiness level are assessed. • Use of biogenic CO 2 for transport fuels can boost EU circular economy. [ABSTRACT FROM AUTHOR]