You could probably use 3D Stroke and add a Turbulent Displace or Roughen edges, along with the glow effect. Draw a mask where you want the electricity to travel, then apply the 3D Stroke and animate it (regular stroke should work too). Then add the other effects and tweak to your liking.
Trapcode Particular could also work, especially if you want to emit some auxiliary particles to make it appear a little more organic.