In a test case last June, Sun reduced the energy used by one its data centers by 93% by switching out older models for its new Niagara servers.

FORBES: Magazine Article

Speaking of sun-powered planes, the Solar Impulse just made its final test flight around the San Francisco Bay Area before embarking on a cross-country voyage next week.

ENGADGET: Inhabitat's Week in Green: flying electric car, 3D-printed livers and a two-story-tall bike

The reason astronomers want to observe reflected sunlight during the transit of Venus is to test whether they can detect the faint imprint of passage of the sun's light through the atmosphere of Venus.

CNN: A transit of Venus, an age of wondrous science