A set of modular homes in Örebro, Sweden providing affordable housing for families have been built with solar panels and passive house principles at its core, making it some of the most energy efficient new builds.

Designed by Stockholm-based architecture studio, Street Monkey Architects, the homes are almost completely powered by rooftop solar panels, while on-site batteries store unused energy that can be sold back to the grid. Additionally, the buildings’ energy consumption is measured on an ongoing basis to adjust for power needs.

The 10 homes, which form an L-shaped development on a large corner lot in Örebro, Sweden, are each composed of six factory-built modules that arrived on-site with finished interiors including walls, bathrooms, and kitchens.

Once erected, the facades were connected together to smooth over transitional moments between the homes. Four houses face east-west, while six have a north-south orientation – and all of the roofs are…