The first activities carried out within the ProSTO project are related to the analysis of following existing STO cases:

• Region of Baden Wuerttemberg — Germany

• County laws — Ireland

• National law — Portugal

• Codigo tecnico, Decret d’Ecoeficiencia, Ordenanza Solar Termica de Barcelona, Ordenanza de Pamplona — Spain

• Regolamento edilizio Carugate, decreto regione Lazio, decreto Comune di Roma, decreto 311/06 — Italy

The data available through these questionnaires have been used to update the existing document “Best practice regulations for solar thermal”, published by ESTIF in August 2007 [2]. The updated document will be available on the project website, as well.

A European workshop has been organised for the project partners: European experts who have been involved in existing STO implementation presented their experience, the strong point and the weak points of each STO.

The most innovative outcome of the project so far is the analysis of success factors and performance indicators, which will be described in the next paragraph. The success factors and performance indicators are quite clear and almost unanimous, meaning that a good STO could be developed following these guidelines.

2.1 Success factors