Source: National Home Services.

We all collect things, and utilities are no different. From raw energy to power plants to transmission lines to distribution centers, energy corporations are the biggest collectors around. But not everything is worth owning.

In the following slideshow, check out three of the weirdest subsidiaries ever owned by Just Energy Group (NYSE:JE), AGL Resources (NYSE: GAS), and Southern Company (NYSE:SO). "Diworsification" is a danger sign for any investment -- make sure your own energy stocks don't fall into the trap.