is it normal for my aquatru to use a lot of electricity? i see my bill went up.

It can be normal, depending on use. The compressor is the main factor. The unit uses around 800 watts of electricity when the compressor is actively cycling. If you are in a busy household and it is chilling and carbonating water frequently throughout the day, that consumption will add up on your bill. Think of it like a small refrigerator running consistently. The 800 watts represents its peak draw during active cooling. If it seems to be running non-stop, it's worth checking that the thermostat isn't set unnecessarily low or that the unit isn't placed in a very hot location, which would force it to work harder. For an under-counter model, ensure the ventilation vents are not blocked. If the electricity use still seems excessive, having a service technician check for a properly cycling compressor or a unit that is stuck on would be a good step.