Moorage...
Check with your marina, ask them what is included in the cost of mooring your boat. Ask the following questions:
1. Is this a mooring ball, or a slip at the marina?
2. What is included in the cost?
3. If power is not included, how much is it, and how is it determined?
4. Same as above for water.
I have had slips where power and water were included. I have had a flat rate for power and water. I have had free water, pay for power to the local marina, fixed rate per month, per usage, also to the local power company.
In Florida, I was charged $45/month for power and water when I wan not even there, and the boat was not plugged in, and using no water. I felt this was rather excessive, but there were no other choices.