The type of HP that generates electricity from flowing water is called a hydroelectric power plant.

Here's a breakdown:

* HP stands for horsepower, which is a unit of power. It's not directly related to the generation of electricity in this context.

* Hydroelectric power plants use the kinetic energy of flowing water to turn turbines, which in turn generate electricity.

It's important to note that the term "HP" is often mistakenly used to describe the power output of a hydroelectric plant. While power output is measured in horsepower, it's more common to use the unit Megawatts (MW) or Gigawatts (GW) for large-scale power plants.