Is the Cloud Truly Greener? Analyzing Cloud Computing Energy Efficiency
Is the cloud truly greener? The environmental impact of cloud computing depends on the data center's energy efficiency, the energy source (e.g., coal vs. renewables), and the equipment replaced. While moving to the cloud can reduce local energy bills, large cloud providers often rely on regions with cheap, fossil-fuel-based electricity, making the true green impact complex and highly variable.
A talk by Tom Raftery of GreenMonk presenting at the Green Economy Conference earlier this month in Dublin, Ireland poses our title question. And the answer isn't as clear-cut, or as green, as you may think.
The problem is doing the math and figuring out exactly what you are replacing with any cloud-based provider, where that provider's data center is, and what kind of efficiency and fuels profile is being used by the provider - and your own data center - to make the calculation meaningful.
The Lack of Transparent Cloud Energy Consumption Data
"As Cloud Computing providers are not publishing any data around Cloud Computing's energy consumption, then it is impossible to say just how energy efficient Cloud Computing is," he said during his talk.
Just because you moved your apps from your data center to a cloud provider and turned off your old and creaky servers doesn't mean you saved the planet. Yes, you saved your energy bill - if indeed you actually turned off those servers. But your provider may not have any more efficient servers on their end. You assume they do, what with virtualization and running a bunch of VMs on a single machine, but still.
How Tech Giants Manage Data Center Energy Efficiency
Google, Microsoft, Facebook and Apple have gone to great lengths to build very energy-efficient data centers all over the world. But they are located in places where they can get cheap electricity per kilowatt hour and, more often than not, these are places that are burning coal to produce the juice. Raftery concludes his talk by mentioning Jevons paradox and the industrial revolution's coal demand, which relates to the industrial revolution and how it created more of a demand for coal-fired industries, which were efficient but still consumed more fossil fuels.
N.B. Raftery was our most recent Cloud Contest judge, but this was a volunteer position.
Frequently Asked Questions About Cloud Computing Sustainability
Does moving to the cloud reduce carbon emissions?
Moving to the cloud can reduce carbon emissions if the cloud provider utilizes renewable energy sources and highly efficient server infrastructure. However, if the data center relies on fossil fuels, the carbon footprint may simply be shifted rather than reduced.
What is Jevons Paradox in the context of cloud computing?
In cloud computing, Jevons Paradox suggests that as cloud infrastructure becomes more energy-efficient and cheaper to operate, the overall demand and usage of cloud resources increase, potentially leading to higher total energy consumption.
Why do cloud providers build data centers in regions powered by coal?
Cloud providers often select data center locations based on the availability of cheap electricity to reduce operational costs. In many global regions, the most affordable electricity is still generated by burning coal, complicating their sustainability goals.