Final answer:
Hot dry rock sources are used to produce geothermal energy through a process called Enhanced Geothermal System (EGS) or Hot Rock Geothermal Energy. Boreholes are drilled into the hot rock formations, and water is injected into these boreholes to create steam. The steam is then used to generate electricity.
Step-by-step explanation:
Hot dry rock (HDR) sources are used to produce geothermal energy through a process called Enhanced Geothermal System (EGS) or Hot Rock Geothermal Energy. In this method, boreholes are drilled into the hot rock formations several kilometers deep. Water is then injected into these boreholes, and the water gets heated by the surrounding hot rocks, turning it into steam. The steam is then extracted and used to drive turbines, which generate electricity.