The conducted scenario analysis shows, that over a wide range of assumptions, PV is a robust measure to decrease the total cost of ownership for heat pump and gas boiler based house energy systems. The existence of a feed-in-tariff and the electricity price structure have a much larger influence on the results than the energy price development. A feed-in-tariff generally incentivizes larger PV systems with higher levels of self-sufficiency, whereas small demand-driven PV systems with high levels of self-consumption are favored in absence of a feed-in-tariff. Overall, the proposed model is regarded as applicable for the identified minimum flexibility requirements for the employed generation technologies. The results from the scenario computations provide a clear and robust picture of the role of electricity generation technologies and flexibility options for future house energy systems.
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