A feasibility study for combining solar thermal plants with small scale 0.5-2 MWth mobile district heating plants under north European conditions was done. The study was done from a heat service company point of view, trying to come up with generally applicable scenarios rather than case studies. It was found that if the saved fuel is mainly pellets, without subsidies it is difficult to find economically feasible payback periods within the plants estimated lifetime, even with moderate pellet price increases. With oil as saved fuel the feasible payback periods range between 10-20 years with an estimated 5% annual oil price increase. The costs of moving the solar plant to another locations were also considered. A rough estimation of these costs resulted in a prolonged payback period of 3-6 years, which is considered too long regarding the general plant payback periods.