This study aims to investigate the effects of different types of sources (a government versus an expert organization) and a (positive/negative) message in terms of perceived benefits, perceived risks, affective images, and acceptance toward nuclear power energy. The university students (n=136) participated in the experiment. The results show that there are statistically significant interactions between the source and information, which affect the perceived benefits, perceived risks, affective images, and acceptance. Also, the nuclear power information given by a government is more likely to be accepted than one provided by an expert organization. Moreover, positive information is more likely to be accepted than negative information. Without controlling the level of credibility and trust of newspaper articles, two predictors remain significant. Those findings suggest that positive messages from the government are more effective in increasing the level of acceptance of nuclear energy information.