power

Great tutorial on how to set up and configure multiple machines to watch a UPS and shutdown when the battery is low. Nut is a fantastic project with plenty of UPS driver support.

Powertop is a command-line tool released by Intel that shows you the power consumption of the applications running on your system. It works best on notebooks with Intel mobile processors and can help you find out the programs that put a strain on your notebook battery. It requires kernel 2.6.21 or newer with tickless idle enabled (CONFIG_NO_HZ) (which is currently available for 32-bit kernels only). Fedora 7 comes with a 2.6.21 kernel by default, so we can use Powertop on it.

Utility companies charge you different rates, depending on the day and time that electricity is consumed. The cheapest rate is at 3AM (no wonder).