Your settings for cookies and pixels on

Select which cookies and pixels we are allowed to use. Please note that some cookies are necessary for technical reasons and must be enabled in order to maintain the functionality of our website. If you would like to benefit from every service on our website, please consider that you need to choose every cookie category. For more information, please refer to our Data Protection Information.

    • Maintain the stability of the website.
    • Save your log-in data.
    • Allow to improve the user experience.
    • They provide advertisements that are relevant to your interests.
    • They allow you to share interesting content directly with your social media network.

You can change your cookie and pixel settings on at any time via our Data Protection Information.


Show Details
Select all Confirm selection

Geothermal energy

Heat from the earth

Geothermal energy refers to the use of heat from within the earth. In broad terms, it may be assumed that the temperature below the earth increases by about three degrees Celsius per 100 m depth.

Sump water

Heat can be recovered from near the surface by extracting it from the upper layers of the earth or from sump water pumped out of open-cast mines to keep them dry.

Because the temperature of the water close to the surface is not sufficient for most purposes (i.e. heating), the temperature must be increased further using a heat pump.

Learn more about our projects to make use of sump water.

RWE Innovation Centre – Sump water
RWE Innovation Centre – Geothermal energy Weisweiler

Heat from great depth

If heat is recovered from greater depths, i.e. 2,000 to 4,000 m, temperatures in excess of 100°C may be expected, and the heat can then be used directly.

Drilling bore holes as deep as this is, of course, labour-intensive and costly, which means accurate inspection of the subterranean layers must be performed first.

Learn more about our Weisweiler geothermal project.

RWE Image RWE Image

RWE Innovation Centre