These solar-powered row-houses in Örebro, Sweden are 150 square meter flats designed for growing families. The site is an L-shaped corner of a larger city block and it is this L-shape and its solar orientation that determined the form of the project. Because the roofs were to be lined with solar panels and because the solar panels should face south, the project was divided into two parts: one part with a North-South orientation and one part with an East-West orientation. The roofline was then designed to articulate each flat invidually and each flat with a south-facing plane. Four row-houses are grouped together with an East-West orientation. These flats have a saw-tooth roof with an East-West ridgeline and a 45° angle for the solar panels. This roof was designed, even in its appearance, to be a rack for the solar panels. The perforated metal triangle in the facade is the rack while the white plaster articulates the actual roof plane. The remaining six row-houses have a North-South orientation but also have an East-West ridgeline. To articulate each flat individually the ridge is placed asymmetrically and then mirrored to create two versions of the same roof. This technique creates individuality for each flat while maintaining a cohesive appearance and building efficiency. The facade materials also follow the same orientation logic. All of the facades that face East or West are treated with white plaster. All facades that face North or South are clad in dark silver steel. This technique creates facade variation and individuality for the residents while maintaining a visually cohesive project. Another facade layer of wood ribs was added outside the steel-cladding on alternate flats to further articulate them individually as well as to add texture, warmth and dimension. This effort to articulate the flats in an individual way is an attempt to expand the interest in the property to buyers who might ordinarily only look at buying a single family home. In this way, the project can hopefully convince families to live in a more energy efficient way. The row-house typology is more compact than a villa and as such, has a smaller footprint and uses less energy. In this project, the typology is combined with passive-house construction and solar-energy, so that it becomes a 0-energy project. Each row-house is constucted with 6 factory-built, prefabricated modules. These modules arrive to the site complete with finishing materials. The facade is then done on site as well as all of the seams between the module divisions so that when construction is complete, there is no evidence of modular prefabrication.