In this paper we discuss design for a combined TPV and solar power system with production of biomass. During the passage through the solar collector cyanobacters or algae are getting sunshine to drive the photo synthesis. An algae suspension is circulated through a solar panel to drive photo synthesis. The flow rate is varying with solar intensity to balance the temperature increase. This is to avoid inhibition of the cyanobacters/algae growth rate due to too high temperature. PV cells are producing electricity when there is light, while TPV cells are used when it is dark. The biomass produced then is utilized for production of photons for the TPV system. As an alternative a system producing Hydrogen and electricity produced in a fuel cell system is discussed. Design criteria for the systems are discussed in this paper for a house that is principally self sufficient on energy. Both theoretical and practical obstacles are discussed, as there are a number of issues to solve before the technique can be used in ”real life”