In course of the Store4HUC project, the so-called Autarky Rate Tool was developed. This simple online tool is available for everyone who considers installing electrical storage solutions in combination with renewable energy sources. With only a few numbers, you can get an evaluation of the

• technical
• economic and
• ecological

effects of the chosen configuration and of course of the autarky rate, which is an indicator for the (in)dependence from the public grid.

If the autarky rate is high, this means, that you are able to self-supply major parts of your energy demand. As the economical perspective is always a substantial fact for every investment decision, the energy cost savings as well as an estimation of the amortisation period are shown too. To evaluate the ecological impact, the CO2 savings, based on the national electricity mix are calculated.

Another major part of the tool is the so-called checklist, which can be created as a PDF-file. On the one hand, the idea of the checklist is to provide the possibility to save the calculation results and, on the other hand, it should serve as a further explanation how to interpret the calculation results correctly. The results are valid in general and not only for historical urban buildings. For those who are planning the integration of a storage in a historical urban centre (HUC), a further page is added, which provides them with additional information and advices from the Store4HUC project.

More information about how to use the tool is available in this explanation video (Link to Youtube). Detailed information about the background numbers used in the tool (energy tariffs; investment costs; etc.) can be found in this document: Link to the document