1.8.0 Beta 4

In this Beta, the on/off state of the mod is saved in the per-world config. That means the on/off state will no longer reset after reloading the world, and changing the on/off state in one world will no longer affect other worlds.

The config is stored at <world root>/alternate-current.conf, and the on/off state is saved in the enabled entry. Setting its value to TRUE will turn Alternate Current on for that world, whereas FALSE will turn it off.

You can of course still change the on/off state with the /alternatecurrent command as well, and doing so will update that world's config.