Amazon is looking to reach a goal of using 50% renewable energy by the end of this year. They already use some solar and wind energy, but are now concentrating on using solar panels at their giant warehouse facilities to green things up more dramatically.
Google is already at around 100% renewable energy used, so Amazon is a little behind the curve, but I'm sure their current efforts will please a lot of people.
TechSpotDepending on the weather conditions and installation specifics, the solar panels could produce up to 80% of the annual energy for a site. This free energy will go towards powering the countless little sorting robots that make each fulfillment center work.