Take your pick. You can use an electric fridge, powered by a generator, a wind turbine or solar power. There are also fridges that operate on kerosene or compressed gasses (Propane or Natural Gas) And if the island is big enough (think Hawaii) they have their own electrical system.
You can use an air compressor. There are also refrigerators available that run on kerosene.
If a refrigerator is off, it consumes no electicity.
Hydro Electicity
because it is
Refrigerator- it takes more power to kick on and it pulls more electricity than a light bulb
water
No.
It depends on the refrigerator. Mostly the average is about 240~280v So i wouldn't touch it if I were you!
No.
A fuse or a circuit breaker can be added directly after the power source (and possibly a transformer) to do this.
electicity
kilowatts
yes