I call BS. What created the current? If it was pumped water he would have gone through a pump and have been ground up. If you look at the picture on the left you can clearly see that is an outfall letting water back out of the plant
I think the pipe is more of an inlet into a pool, and the pumps are actually from that pool to the power plant.
pumping from that pool to the inside of the plant lowers the pool level, which created more inflow through the pipes