Geothermal plants are often exposed to problems that affect the performance of the plant. Typical problems are mineral scaling, particles clogging, corrosion and temperature/stress related effects of geothermal flow and injectivity. In the PERFORM project contains data about the properties and geology of the reservoirs, the chemistry of the water and precipitates and the construction of the plants. The goal is to give recommendations that can help the operators to avoid or mitigate the problems The PERFORM project especially focuses on the deep reservoirs (> 1 km deep). The plants are represented as points.