Low-carbon transition is gaining momentum, but relatively little is known about the public preferences for low- and zero-carbon electricity portfolios given their environmental, health, and economic impacts. Decision science literature argues that conventional opinion surveys are limited for making strategic decisions because the elicited opinions may be distorted by misconceptions and awareness gaps that prevail in the public. We created an informed citizen panel ( N = 46) in Switzerland using technology factsheets, interactive web-tool Riskmeter, and group discussions. We measured the evolution of the panel's knowledge and preferences from initial (uninformed) to informed and longer-term views 4 weeks after. In terms of energy transition, our elicited technology and portfolio preferences show strong support for the low-carbon electricity sector transition, especially relying on hydropower, solar power, electricity savings and efficiency, and other renewable sources. Since these informed preferences are structurally different from the futures considered by many energy experts, we argue that these preferences should also inform the Swiss Energy Strategy 2050s implementation. In terms of methodologies in decision science, our factsheets, Riskmeter, and group discussions all proved effective in forming the preferences and improving knowledge. But we also intriguingly found that in a longer run the participants tended to revert back to their initial opinions. The latter finding opens up multiple new research questions on the longer-term effectiveness of informational tools and stability of informed preferences.

For a successful transition to low-carbon electricity supply, public support is essential. Citizen preferences are best understood in the process of informed citizen panels, where citizens are informed about the pros and cons of various electricity technologies and spend time reflecting on the trade-offs. We investigated how information about electricity technologies and their sustainability impacts can change citizens’ preferences and affect for the complete Swiss electricity mix 2035. The citizens received information as factsheets and, during workshops, discussed in groups and built their preferred electricity mix using an interactive tool. The informed citizen panel (N = 33) in the Swiss city of Geneva showed high support for domestic renewable technologies and end-use efficiency, as well as low support for net electricity import, natural gas, and nuclear power. Preferences and affect for unfamiliar technologies changed after receiving information and remained stable even in the longer term four weeks after. Preferences and affect for already familiar technologies, like hydropower, barely changed. The same procedure in the two Swiss cities of Geneva and Zurich (N = 46) enabled the identification of robust support for renewable technologies and efficiency with only minor context-specific differences.

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