160 for all 20% bonus (small area) decorations related
400 for all 12/10 % bonus (large area) related
and 650 for if you want to permanentely crew them
that's in total
1210 EP in total a bit more then a Tier 9 Unit wich you cannot afford the risk of losing it
but i'm not telling you to buy things
don't buy if you don't want to
just buy 12 switching centers and place them like thoose in that screenshot below
you can settle down and do it all by requests and 192 % resource (crewed)
that makes for oil an ammount of 1971 exacly my year of birth