In this diploma work we suggest some educational goals that can be related to the topic of biogas at scientific school subjects, such as Technology education, Science, Chemistry, Biology and Science and technology education. Namely, Slovenian elementary school wants to reach higher level of cross-curricular connections. Firstly, we introduced the concept of biogas, its production and most common usage. Follows the description of biogas plant and representation of some historical facts about biogas and its production in Slovenia and in Europe. At the end of this diploma work there are some suggestions made about usage of educational goals during particular classes. There is also an overview of workbooks for Technology education about biogas.