Methods of measuring sustainable development of the German energy sector

► Sustainability indicators are a precondition for converting the model of sustainable development. ► The measurability of sustainability is the key to the implementation of sustainable development. ► The two Indices (ISUD, SSEI) calculate the degree to which sustainability is achieved. ► The indices compare the normatively defined sustainability order with the behaviour of society. ► The indices show whether Germany is on a sustainable energy path.