Pearl River Tower - Guangzhou City - one that architects call the most energy-efficient skyscraper.

[Snarkoleptic]

Large scale solar panels are installed on the building’s façade to generate energy from sunlight. Use of natural lighting is maximized via controls that respond to light and are integrated into a system of automated blinds. The blinds themselves are equipped with photovoltaic cells, so even when they are closed, the Sun’s energy is still being efficiently harvested.

http://www.amusingplanet.com/2013/06/pearl-river-tower-most-energy-efficient.html

Interesting juxtaposition of the building and smog filled cityscape.
?imgmax=800