Cloud computing is secure, simple, keeps you productive and saves you money. But the cloud can also save energy. A recent report by the Carbon Disclosure Project (CDP) and Verdantix estimates that cloud computing has the potential to reduce global carbon emissions by millions of metric tons. And Jonathan Koomey, a consulting professor at Stanford who has led several studies on data center energy use, has written that for many enterprises, the cloud "is significantly more energy efficient than using in-house data centers."
Because we're committed to sustainability, we sharpened our pencils and looked at our own services to see how they stack up against the alternatives.
We compared Gmail to the traditional enterprise email solutions it's replaced for more than 4 million businesses. The results were clear: switching to Gmail can be almost 80 times more energy efficient (PDF) than running in-house email. This is because cloud-based services are typically housed in highly efficient data centers that operate at higher server utilization rates and use hardware and software that's built specifically for the services they provide—conditions that small businesses are rarely able to create on their own.
In calculating these numbers, we included the energy used by all the Google infrastructure supporting Gmail and YouTube. Of course, your own laptop or phone also consumes energy while you're accessing Google, so it's important to choose an efficient model.
There's still a lot to learn about the global impacts of cloud computing, but one thing we can say with certainty: bit for bit, email for email, and video for video, it's more efficient in the cloud.