Question

How is the geothermal heat produced near active volcanoes used as an energy source?

Answer 1

Steam from geothermal vents are used to drive a turbine which ruins generator and produce![enter image source here]
.

Explanation:

Series of bore holes connected to power house to bring steam.This runs turbines to produce electric power.
Picture credit Alpine.com.
Picture credit www.3 EPA.gov/