Sustainability Indicators for Energy Systems to Enhance Decision Making Processes

1. Abstract The energy sector plays a key role within the concept of Sustainable Development. However, there is consensus that today’s energy system is not sustainable. A transformation towards more efficient structures as well as a shift to renewable sources is needed. To get on the right track, sustainability aspects should be addressed within the scope of technology assessments. This applies in particular to new (renewable) energy systems introduced to the market. To identify the best technological options, indicators are needed. According to the sustainability concept, they should cover ecological, economical and social aspects. Likewise, they should comprise all steps of a system’s life cycle. For practical application, all relevant sustainability issues should be covered by a minimum number of indicators. Within a research project, seven appropriate indicators were found and applied to wind energy converters, photovoltaic systems and a natural gas fired gas and steam plant. The results of sample calculations show characteristic strength and weakness profiles.