Why Being Climate ‘Positive’ Is the Buzzy New Goal of Green Building

The three buildings, dotted around Norway, couldn’t look more different: a soaring timber-and-concrete obelisk in Porsgrunn; a squat, two-story Montessori school on the edge of a forest in Drøbak; and a concrete and glass wedge-shaped office in Trondheim, just a few hundred miles from the edge of the Arctic Circle. But they share a distinctive feature. Each has a roof perfectly tilted to squeeze out every possible drop of solar energy.

They are called Powerhouses, and the initiative behind them claims they are all “energy positive”: The upfront energy “cost” of each building, and that of later demolition and disposal, is expected to be made back over the building’s lifetime. Powerhouses sometimes draw from the grid, especially in winter, but in the long Nordic summer days they give back many times over, overspilling excess solar energy into surrounding homes and businesses.