high degree of energy autarky of over 90%, meaning that 90% of needed energy is obtained locally from renewable sources. The technical systems are based on existing technology (combined heat and power unit, photovoltaics, thermal collectors), innovative wastewater treatment (the wastewater is going to be purified on-site to be reused as greywater) and foremost an ingenious energy management, which takes into account external conditions such as weather forecast and anticipated occupancy schedules to achieve the demanding goal of the high degree of autarky. Mikrohaus The basis for Mikrohaus is a 8,80 × 3,44 × 3,25 m cube that allows as kind of modular assembly system to combine several of them and hence to generate a flexibility in the size. The cube(s) don’t have any fundament (only screws of 1,40 m length) which allows some kind of mobile living. No cement and therefore time for drying is requisite. Additional floats allow also an installation on water. The building offers a high isolation up to passive house including e.g. photovoltaic (PV) energy supply. The cubical form allows a good ratio from volume to surface. The concept includes waste water treatment for greywater via wastewater treatment plant with an ultraviolet light (UV) treatment unit for sanitary water. Additional planted walls (www.gruenwand.at) are used outside (for cooling/summer, isolation/winter, noise prevention) and inside (for climate and humidity aspects) which also are used as water-filters as kind of biological purification plant. Autarc homes Autarc homes provides the 1st swimming passive-house worldwide and was originated to provide clients autarkic buildings on the basis of a protective handling of our natural resources to present the following generations a working basis of life. The swimming and rotatable passiv-house has its own on-board energy generation, water supply and disposal. The idea is to provide a sustainable, energy-efficient, environmentally compatible and affordable living space. The building can be orientated at the sun to get the most possible effect out of it. As this building is located on water the rotation process is done very energy-efficient. The tasks are decentralized energy supply and storage, decentralized effluent disposal and recycling/ reprocessing and drinking water supply. Pithouse Energy production Life on our planet is a permanent energy flow between living things and the environment. Most of the currently used energy resources, such as oil, coal, natural gas and uranium are non-renewable. The supply of them buried in the earth is limited and (with the