You need wood to make the charcoal
So you start with a bunch of Coal/Charcoal to start the process

Then you need Generators (1 or more)
You put the Charcoal on the Generator, and output it to the MFE
The MFE can output to a LV Transformer and then the LV Transformer can power the Electric Furnace
With that, you can make Charcoal easier as infinite source

A BIG note:

You can use CABLES to share the eletricity, just like in real life!