Model Answer

The diagram shows the process of electricity generation from cold water through the use of a geothermal power planet. This is a process which converts cold water, through using a geothermal area of rock 4,5 kilometres below the earth’s surface, into electricity ready for consumption.

There are 5 essential stages or functions which constitute the electricity generation process. First, cold water is pumped into the injection well underground, where it then undergoes natural heating via hot rocks, converting the cold water into hot water via the natural geothermal properties of the rock.

Once the water is heated it is extracted from the production well and enters into a condensing chamber in which it vaporizes and turns into steam. The steam is then fed into a steam-powered turbine which drives a generator, and this converts the mechanical energy of the turbine into electrical energy.

The electricity produced is then fed into the electrical grid distribution network.