how do you find the idea to split the powergrid in an AC and a DC grid?
AC is produced by the generators and is used for power up the machines and inserters.
DC is produced by solarplants and can be stored in batteries.
To use AC and DC together you need converters and inverters.
And to make the game a bit harder, whats about a limit for the throughput for the powerpoles?
And some nice effects if some poles are overload and explode like cars in american movies
