Kuggen (Swedish for 'the (cogwheel) cog') is a building owned by real estate company Chalmersfastigheter as part of Chalmers University of Technology in Gothenburg, Sweden.

[3] The Kuggen building serves as an academic link between Lindholmen and companies in fields such as mobile data communications and media design.

A movable sunscreen tracks the sun and contributes to the shade of the two top floors,[5] while nearby buildings cast their shadows on the lower levels.

[6] Kuggen makes use of green building technology on six different levels: adaptive ventilation; adaptive lighting; interactive heating and cooling systems; photovoltaic cells integrated into a screen system that provides additional shade and electricity; a roof-mounted array of sun collectors that aid the heating tap water; and effective daylighting.

The result is a building that aims to limit energy consumption[8] to 60 kWh/m2 per year—well below what is considered a green building—while providing temperature within individual offices between 22 and 26 degrees Celsius.