I want to buy the FarmBot Genisis XL and I don’t know how much are the costs for electricity and water?
In theory uses less water and is more effective, as it waters each plant individually.
As per electricity usage see: Electricity requirements in NZ
https://farm.bot/pages/footprint
Its hard to predict the cost of electricity and water as it depends on how you are using the device, like how many duty cycles per day are needed and how long your growing season is.
There is a rough calculation in the hardware docs that may be a bit out of date, but you can still work with it. If you are worried about those costs, you can consider using rainwater and solar power.