This year's Blog Action Day theme is water, and with that in mind, "we thought we'd share a bit about Google's efforts to conserve water, in a variety of ways. "A major reason why our data centers are so energy efficient is that we use evaporation to cool our facilities, rather than a more traditional chiller. Evaporative cooling uses far less power than a chiller -- so by using a fraction of a gallon of water for evaporative cooling, we save a gallon of water at power plant. We've rather than use clean, potable water, treat wastewater until it's clean enough to be used for cooling. We're also working on new, geographically appropriate systems, like large rainwater capture ponds at one site and a seawater cooling system at a data center currently under construction.
We've also made some small changes at the Googleplex in Mountain View. Earlier this spring, we worked with the city of Mountain View to become the first commercial customer of recycled water for irrigation," stated Matt Cutts.