Be aware that the higher your power, the higher the power pricing bracket you will be placed in.
That is only half-true, there is a subsidized rate for low-income families, but it's only available at 450 and 900w power ratings. Above that, the price per kwh is the same:
http://listrik.org/pln/tarif-dasar-listrik-pln/
If a household has an electric water heater, electric tea kettle, electric oven, microwave, washing machine, and multiple ACs there will always be some juggling involved, even at 5500kwh.
I would first calculate the maximum wattage I would be likely to pull from my ACs. Maybe you have 5 but you never use more than 3 at a time. Then I would make sure my electrical supply is at least 1.75x that amount. So if you have 3 ACs that are 1pk (mine says 590w) that's 1770w, so *1.75, look for at least 3100w supply.
Use gas for heating water and a gas oven. A washing machine and microwave may not be able to be used at the same time (with the ACs on), but that should be easy enough to avoid.