How Geothermal Energy Works

How it works

The principle is very simple, the ground becomes warmer the closer to the earth's center we come. By drilling two deep holes (wells) of about 2-6 km, you can bring up hot water from hundred to several hundred degrees, the temperature depends primarily on the depth. Drill depth depends on geological conditions, in Hungary it is enough with 2 km deep bore holes to achieve economically interesting water temperatures (90-130 ˚ C). Equivalent depths in Sweden are 5km. When the hot water around (90-130 ˚ C) reaches the surface and is lead into the geothermal plant it gets heat exchanged against a secondary heat carrier with lower boiling point than water (Binary Cycle Technology), the heat transfers the liquid into steam. The steam drives a turbine which generates electricity, the hot water is used for district heating and district cooling.

Geothermal Exploration

Geothermal power plants can be built anywhere in the world, but the economic conditions vary across the world. The largest cost is the bore holes, the deeper the hole is, the more expensive it is. It is preferable to find areas where there is a good supply of hot water at a fairly shallow depth. Energeotek can build geothermal power plants all over the world. Ideal places to build at have a good supply of hot water at a relatively shallow depth, 2 km and a densely populated country, which gives a good market for district heating and cooling.

Geothermal Drilling

By drilling two deep holes (wells) of about 2-6 km, you can bring up hot water from hundred to several hundred degrees, the temperature depends primarily on the depth. Drill depth depends on geological conditions, in Hungary it is enough with 2 km deep bore holes to achieve economically interesting water temperatures (90-130°C).

Geothermal Power Plants

This is a movie of geothermal power plant. Energeoteks power plant requiers a very small area and fits well in the landscape. This movie shows how the principe of a power plant works.

And this is how the ORC-engine works.