The 23 story headquarters of Manitoba Hydro in downtown Winnipeg, Manitoba, Canada. Considered one of the worlds most environmentally friendly office towers. Technologies employed include; geothermal heating, radiant cooling, windows that open and a solar chimney to improve air circulation. The building is highly automated and reportedly uses 60 percent less energy than a conventional building of similar size. All this in the climate extremes of Winnipeg, which has very wide seasonal temperature fluctuations.