This Master’s thesis explores the possibility to use mobile persuasive technology to persuade people’s pro-environmental behaviour. This was done by designing, implementing and deploying two mobile applications in two domains (water conservation and power-consumption). Ten households were deployed in Denmark and Australia. Based on the deployments, several themes has been elicited and discussed. Finally, the thesis sum-up the two research projects, and eight guidelines has been elicited and described out of the common findings. The guidelines are instructive to consider when designing mobile persuasive technology to promote a pro-environmental behaviour.