Improving energy efficiency and reducing environmental impact as we scale is a top priority for our data center teams. We’ve talked a lot about our progress on energy-efficient hardware and data center design through the Open Compute Project, but we’ve also started looking at how we could improve the energy efficiency of our software. We explored multiple avenues, including power modeling and profiling, peak power management, and energy-proportional computing. One particularly exciting piece of technology that we developed is a system for power-efficient load balancing called Autoscale. Autoscale has been rolled out to production clusters and has already demonstrated significant energy savings.