This module aims to import battery life, and lower power consumption.
This module loads and optimises some settings to optimise battery life. This is important for laptops and home servers who need to watch their power consumption more closely.
This is what the options look like you can add to your machine-settings:
{
machine-settings.system.modules.power-efficiency = {
enable = boolean;
};
}
Take a look at the NixOS article on laptops and power saving for more information.