Studies suggest that simulations and games not only improve target language skills, but they can also support knowledge creation regarding a broader variety of topics. Thus, we wanted to explore how playing an online simulation game affected knowledge of energy supply and its relationship to environmental and economic factors among learners of English as a Foreign Language (EFL) in Japan. This particular topic was selected due to its immediate relevancy in Japan which faces energy supply and environmental issues in the wake of the Fukushima nuclear accident. The presentation will report on a qualitative exploration of debriefing reports produced by Japanese university students after playing Energy City, an online simulation game. The game models various urban scenarios in which the objective is to supply sufficient energy to power a city with electricity while minimizing environmental impacts, addressing stakeholder concerns and balancing a budget. Students used the game in small groups, after which they completed debriefing reports designed to foster reflection on the game playing experience. We performed a content analysis on the reports to identify major trends and themes which could offer insights regarding the learning outcomes. The results indicate the possibility that gameplay may influence attitudes toward nuclear power production and personal behavior with regard to energy consumption. The principal investigator intends to use these results to author a quantitative survey instrument for the purpose of investigating whether attitude and/or behavior change occurs at a statistically significant level. [For full proceedings, see ED564162.]