Effizienzhaus Plus, Model house in Charlottenburg, Germany

Effizienzhaus Plus is a model house in Berlin that combines residential space with solar panels and modern design. The two-story structure uses black photovoltaic modules on its roof and walls to generate electricity.

In the second half of 2010 the federal government launched an architecture competition for a research pilot project on efficient building and electric mobility. The team of the University of Stuttgart's ILEK institute with architect Werner Sobek won first prize; TU Dresden took second and the Berlin University of the Arts third. Chancellor Angela Merkel opened the finished house on 7 December 2011.

The house demonstrates how modern living spaces work with solar energy and how people can shape their daily lives more sustainably. Visitors see how technology and housing fit together today.

The ground floor is barrier-free apart from the kitchen fittings, and the upper floor is largely step-free; the whole level and its access can be made fully barrier-free without major structural work. The house is modular and can be converted for other uses. The energy core and the glazed bay facing Fasanenstraße, where the electric vehicles park and charge, are visible from the street.

The technical room, called the Energiekern, sits on the street-facing side and is visible from outside through a shop-window front where the house's electric vehicles park and charge. The lithium-ion battery works bidirectionally, storing surplus solar power or feeding it back into the public grid.