Power>Miscellaneous>Radio Beacon
Hook it up to a generator and voila.
Any more questions? I've spent about 6 hours building settlements out of 26 hrs total. Let me know.
You'll need to find some complex electronics parts and then just choose it from the menu and drop it.
And just to be basic about it, there are some items that can only be placed on the ground, some only onwalls, some only on ceilings, some only in dirt, some only in water, etc etc...
And how do I get power to my floor lamp? There is no option to attach a wire to it.
Basically, put a Switch on the wall of the house, hook it up to a generator and the whole house should be powered.
[https://www.reddit.com/r/Fallout/comments/3sebrf/psa_this_is_how_you_power_up_a_house/]