Aiso are one of the few hosts that offers hosting 100% powered by solar panels, a renewable and clean energy source. They don't buy any energy credits (RECs) to offset their environmental footprint.
If you want you can watch their 120 solar panels on a live security camera here. The solar panels doens't just power their data center and servers, they also power their offices. According to BP Solar, Aisos solar panel system will eliminate the production of: 19,890 pounds of Carbon Dioxide (CO2/GHG) per year, 5.9 pounds of Nitrous Oxide (NOX/smog) per year, and 0.45 pounds of Sulfur Dioxide (SO4/acid rain) per year. This is the equivalent of planting 3.5 acres of trees per year or driving a vehicle for 24,671 miles (9.7 times from LA to NY) per year.
Aiso data center and office interior is completely built using steel. Aiso also has 7 solar tubes which bring in natural light from the outside. That means that they don't need to run lighting during the day. Their backup generator is runs on propane gas. Propane gas is cleaner burning than diesel and does not emit large amounts of carbon dioxide and produces no sulfur dioxide or particulate which is the primary causes of the greenhouse effect and acid rain.
Doesn't all that sound great? But wait! There is more. Aiso is also planning on placing a green roof for the data center. They will also replace all their compact fluorescent light bulbs (CFLs) with LED lightning (contain no mercury).
As a little side note Aiso is the hosting provider of Live Earth (SOS).