In this Editorial, we tackle perhaps the most urgent issue of our time – the need to orient lives more towards sufficiency. Achieving such a transformation also requires a parallel paradigm shift in science. In this Editorial, we have two guest authors, Teemu Koskimäki and Aleksi Neuvonen, who are members of the SISU Consortium doing research on sufficiency transition in Finland.

Amid the complex and persistent challenges of sustainability transitions, experimental governance has emerged as a way to foster reflexivity, learning, and policy innovation through diverse participatory practices. This paper examines the role of transition arena methodologies in expanding and deepening civic engagement in low-carbon transitions, specifically through seven experimental processes focused on “climate-wise housing” in Finland in 2023. These experiments combined digital and in-person facilitation in an attempt to involve citizens in co-producing actionable insights on climate-smart behaviors, building renovations, and renewable energy adoption, hitherto directing the envisioned transition. The research explores three “avenues” of widening participation in transition arenas, namely expanding, complementing, and opening such arenas to explore questions regarding the potential and limitations of widening transition arena participation and the impact of such breadth on the depth of citizen engagement. Findings highlight trade-offs between different scopes and modes of citizen participation and reveal how participatory processes shape public engagement and policy responsiveness. By suggesting four implications on designing and implementing citizen engagement processes, the study contributes to a nuanced understanding of participation in transition governance and its implications for sustainability transformations.