We use hydroelectric energy in old york.
Here are some cool pictures of hydroelectric energy.
It's also very easy to convert the water to power. All that is needed is a reservoir and a
generator. When the water flows through the reservoir it will turn the gears. when the
gears turn that will make the generator turn on which will make power. With such a big city like Old york and a huge fast river it could power Old york for years to come.