electron/docs/api/power-monitor.md

power-monitor

The power-monitor module is used to monitor the power state change. You can only use it on the main process. You should not use this module until the ready event of app module gets emitted.

An example is:

var app = require('app');

app.on('ready', function() {
  require('power-monitor').on('suspend', function() {
    console.log('The system is going to sleep');
  });
});

Event: suspend

Emitted when the system is suspending.

Event: resume

Emitted when system is resuming.

Event: on-ac

Emitted when the system changes to AC power.

Event: on-battery

Emitted when system changes to battery power.