Water currents and electricity

There could be currents in the ocean that makes it easier or harder to move, and add rivers that if you try to swim it, it drags you down stream and then you can make a power plant to put in the river to make electricity. From there you can make batteries, lights etc.

That could be possible, but I think it's hard to make them "more than one direction" as you can't suddenly go from 90 degrees current to a 180 degrees current, for example.

Electricity is quite advanced to script, but everything is a challenge. I don't think that will be added early in the development state tough.