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BackgroundWhen integrating power-to-gas (PtG) in the biogas sector (BGS), it is essential to consider how risk is perceived and handled since it influences technology uptake, acceptance, and legitimacy. In this study, we aimed to identify factors that determine how risks are managed in the BGS grounded on stakeholders’ perceptions of environmental and safety risks, and the socio-political, technological, and economic challenges associated with the adoption of PtG in this industry.MethodsSemi-structured interviews were conducted with 27 experts located throughout Germany. They represented relevant institutions associated with the development of the BGS and PtG. Participants included expert stakeholders from science, industry, associations, and politics. The interview data were assessed by the use of thematic qualitative text analysis, followed by inductive reasoning, based on holistic and axial coding of the transcribed interviews.ResultsThe participants predominantly trusted existing regulations to ascertain that environmental and safety risks from this energy concept are under control. The expert stakeholders were convinced that except for farm-based biogas facilities, there is adequate know-how in the BGS to appropriately manage risks of biogas and PtG technologies and thus prevent potential negative externalities. Furthermore, they were inclined to identify socio-political challenges, such as public criticism of biogas, and missing financial incentives as the most relevant matters to the development and adoption of PtG in this sector. The interviewees mainly identified politicians as responsible actors to handle identified risks and challenges. Such risk rationalities are characterized as hierarchist in the cultural theory of risk perception.ConclusionsPossible reasons behind the prevailing high level of risk tolerance among the participants of this study could be related to (1) strong reliance on governmental action, technical protocols, and the perception that others are responsible for risk management in the BGS; (2) a high confidence in expertise in the biogas industry to control risks; and (3) the tendency of experts to advocate biogas and PtG, linked to possible professional roles and motivational factors. These aspects may influence them to attenuate the urgency to prevent accidents and environmental risks, even if this can have undesirable consequences when incorporating PtG in the biogas industry. While critical environmental and safety risks are not acknowledged and adequately tackled, societal controversies may accentuate to the disadvantage of the BGS and the potential benefits linked to the integration of PtG in this field. We recommend implementing measures that enhance risk awareness within this community, urge interest groups to adopt collaborative risk management strategies and consider the involvement of multiple stakeholders in risk assessment and control, and likewise, address the particularities of the social context in defining strategies for risk management and communication.

Integrating power-to-gas in the biogas value chain: analysis of stakeholder perception and risk governance requirements