This project is inactive and its default file will likely not work with the most recent version of Minecraft. The author may have abandoned it, or it may have outlived its usefulness.
With this plugin you can do /explode (target) and you will spawn on the target with a lot of Charged Creepers that have automatically have the targetted-player as their target.
Some Screenshots of the Charged Creepers spawned with the plugin.
sounds fun!