Manitoba Hydro Place - Winnipeg, Canada [KPMB]

The new headquarters for Manitoba Hydro Place by KPMB architects is under construction. KPMB and Smith Carter and Transsolar have launched a great website that details the sustainable strategies used. The project used 100% fresh air year round in a very cold climate. It also utilizes a tall solar chimney seen in the above image, a double curtain wall facade, one of the largest geothermal systems in North America, special humidifying water features, green roof...and the list goes on.

I suggest reading more about the project on the KPMB website.
A 115 metre (377 foot) tall solar chimney marks the north elevation and main entrance on Portage Avenue, and establishes an iconic presence for Manitoba Hydro on the skyline. The solar chimney is a key element in the passive ventilation system which relies on the natural stack effect. The chimney draws used air out of the building during the shoulder seasons and summer months. In winter, exhaust air is drawn to the bottom of the solar chimney by fans, and heat recovered from this exhaust air is used to warm the parkade and to preheat the incoming cold air in the south atria.

Harvard Design Magazine article on Manitoba Place