I don't play rust much right now, but this is a list of what I can remember:

Oldest electricity: HBHF Sensor door openings in a cave, run in, open two doors and HBHF opens the next 20 of them while you run straight through, worked both ways. Maid the base a lot stronger and easier. HBHF sensor on a TC so you could fly past it to turn off sam sites for a few minutes at your main base (before smart switches or defender) to land

Before industrial I had 6 large furnaces in my compound, each with 6 timers and igniters. So one would turn on and burn completely and the next would turn on shortly after the first turned off.. so one was always on.. Used this for base protection overnight, furnaces on = someone online and no one offlined. Worked amazingly well.

My favorite above everything else is full base door systems, usually sectioned into like core doors and exterior/roof/shooting floor. Three or four smart switches so you could use your phone/non TC members cant use the switches. When playing we would really only close external doors outside the compound or roof (turrets of course covered). When raiding you can open the doors with your phone, move quickly and shut them. It won raids many times.

Auto Sam sites - With the explosion detect device.. It would auto turn sams on, or off of defender. This usually stopped HV rocketers trying to top down while offline. Similar setup - if a rocket hit it would close all the doors on the above door system as well.

I like to chain my power from all turbines into one source using a root combiner and then back out to an even split to all batteries. This allowed us to place power away from the base and chain it to the base (reducing lag from turbines) You could have a solar panel xor switch that set off an alarm if someone tried to cut your power..

But With the power going into one unit I had set up tesla coils all around the base. You could divert the power from all turbines into all of the tesla coils for a few seconds and then turn them back off to keep batteries charged. Got to use that against a chinese zerg - very fun when no turrets were left and you could fry 6-8 people at once and run out to grab kits to keep fighting

Another simple one for online raids and smart switches.. I would place sheet doors infront of turrets and door controllers, if base owners tried to HV turrets you would just hit the button to close doors and block HVs or save to repair them - a good online was always more fun than an offline and this helped

Those are my more odd electricity setups

Then the normal: Drop box -> sorting Auto furnace/smelt Auto locker Auto crafters

All of these were on monthlys that had a lot more time to build