on OSX: http://superuser.com/questions/8381/can-i-reduce-the-cpu-speed-of-my-macbook-when-on-battery http://superuser.com/questions/8381/can-i-reduce-the-cpu-sp

on OSX: http://superuser.com/questions/8381/can-i-reduce-the-cpu-speed-of-my-macbook-when-on-battery http://superuser.com/questions/8381/can-i-reduce-the-cpu-spe... on Windows: http://superuser.com/questions/565347/how-does-windows-limit-the-cpu-power-options-battery-saving http://superuser.com/questions/565347/how-does-windows-limit... On Linux: https://wiki.archlinux.org/index.php/CPU_frequency_scaling https://wiki.archlinux.org/index.php/CPU_frequency_scaling You can also play with the BIOS, according to https://en.wikipedia.org/wiki/Underclocking https://en.wikipedia.org/wiki/Underclocking