Secondary school students (15-16 years of age) learn in a learner-centred learning environment about energy use, fossil energy and renewable energies. The emphasis lies on how saving fossil based resources by saving energy and using renewable resources like biomass, wind, water and sun. During the first part of the learning scenario the students working with offline material. In the second part of the intervention the learners working with an interactive energy game/simulation. The aim of the game is to substitute all nuclear and fossil power plants with renewable energy.