The Regional Planning Authority of East Wuerttemberg is constantly involved in different spatial development projects in the region. This includes authorizing solar parks. The town of Schwäbisch Gmünd wanted to realise the idea of a solar park according to its action plan for climate protection in 2011 but it found that the UNESCO World heritage LIMES border (a protected archaeological monument) crosses the territory of the solar park. In accordance with the state archaeological protection law (§2 DSchG), a 30-meter-wide buffer corridor along the LIMES border had to be integrated into the future solar park. As regards other planning aspects, the Regional Planning Authority pointed out that the targeted territory is preserved as a settlement area according to the regional spatial plan whereas the structural plan of the town of Schwäbisch Gmünd designates it as a special building area. After all normative inconsistencies had been clarified and the onstruction began on 4 October 2012 and lasted until April 2013. Nowadays the “Mutlanger Heide” is the 2nd biggest solar power plant in Baden-Wuerttemberg, consisting of more than 23,000 modules and producing about 7 MW electricity a year (capacity for around 2,000 4-person households). The realisation of the project distinctly shows that spatial development can be effectively harmonised with archaeological protection aims. With this in mind, the Regional Planning Authority of East Wuerttemberg issued a special handout in 2020 to better informing about solar park development in order to handle a growth in demand for them in the last few years due to a change in state funding requirements. It is of special interest for future ISTER- project activities as it illustrates the interaction of state, regional and city plans as well as a positive outcome for shared land use and conflict reduction regarding a monument of Roman heritage.