Geothermal energy

Geothermal energy

Geothermal energy captures the heat from two to three kilometers under the earth’s surface where water meets heated rock and turns it into steam. Steam is led from boreholes to turbines inside the powerhouses of geothermal energy plants, transforming thermal energy into electricity.

Buying Guarantees of Origin from geothermal energy guarantees that the renewable energy consumed is from this source.

Geothermal energy production is unique because:

  • It is a non-polluting and environmentally friendly renewable energy source
  • Has no waste and does not generate by-products
  • Has low land-use footprint
  • Does not represent a hazard for the natural surroundings
  • Has a low maintenance cost
  • Is not dependent on weather conditions.

Geothermal energy can also be used for heating and cooling, cooking, hot spring baths, agriculture, aquaculture and industrial processes.

Geothermal energy is only found in a few locations and the installation cost is high.

Around 640 MW of new geothermal power capacity came on line in 2014, with smaller increases the following years. The total global is now approaching 14 GW. The largest share of geothermal power capacity is in Indonesia, followed closely by Turkey. In Europe, Italy and Iceland produce the most geothermal electricity,

Over the past five years, total geothermal power capacity has grown at an average annual rate of approximately 4%, and heat capacity at approximately 6.0%.


Meet an environmental standard of your choice

Consume renewable energy meeting requirements of specific standards or ecolabels. Buy Guarantees of Origin from power plants that meet stricter environmental standards and are verified by an external auditor. Choose between national or international ecolabels and standards, document the age and type of the power plant, technology and unique operational focus, and raise funds for renewable energy projects.


International ecolabel for renewable electricity with strict criteria for environmental impact, and that directs funds to new renewable energy projects


German ecolabel for renewable electricity from new or upgraded power plants


An international ecolabel empowering women in developing countries. W+ measures impact on women’s lives.


German ecolabel for renewable electricity from new power plants, with a mix of technologies and fund allocation

Bra Miljöval

Swedish ecolabel with strict environmental criteria

Naturemade Star

Swiss ecolabel with strict environmental criteria

Green-e Energy

Green-e is North America’s leading certification program for renewable energy.


Global standard for design, construction and operation of high-performance green buildings


European environmental building standard for the construction industry

Customise to fit your specific needs

Consume renewable energy with specific characteristics. ECOHZ provides access to a comprehensive portfolio of more than 200 power plants, located across five continents. This enables you to choose specific power plants with distinct characteristics, including choice of technology, location, age, size, and owner profile.