News & Events


Dürr Cyplan’s ORC system increases the efficiency of a geothermal power plant in Indonesia


Bietigheim-Bissingen, February 28, 2014 – Dürr Cyplan’s ORC technology (Organic Rankine Cycle) will increase the efficiency of a geothermal power plant in Indonesia. The pilot plant, used during a project of a German research institute in this Southeast Asian country, can increase the amount of electricity generated by up to 10%.

Geothermal power plants in Indonesia use steam to drive turbines and generate electricity. High-pressure hot water from a reservoir in the earth’s interior rises to the top through a borehole and evaporates in the power plant upon decompression. The steam is fed into the turbine, which produces electricity by means of a generator. Any water that has not evaporated is reinjected into the earth’s interior while still hot.

In future, the ORC system will be integrated into the cycle before the water is reinjected into the earth. It can generate additional electricity using the thermal energy of the hot water. Steam also drives a turbine in the ORC system. However, this steam is extracted from another medium, which is evaporated with the hot water. This medium has a far lower evaporation point than water.

Process principle

Process principle

The ORC pilot plant in Indonesia has an electrical capacity of 500 kW. It increases the efficiency of the system as a whole. This technology makes it possible to produce up to 10% more electricity in existing power plants.

Dürr Cyplan received the order for the pilot project in November 2013. The ORC system will be completely pre-assembled and tested in Germany before being delivered to the Southeast Asian country. Indonesia has around 40% of the world’s geothermal resources and is a pioneer in generating electricity from geothermal energy.

Expanding its energy efficiency business is a strategic focus at Dürr. Aside from ORC, the company offers further technologies for the efficient use of heat and waste heat. These include heat pumps, heat exchangers, and the Dürr Compact Power System which provides electricity and heat at the same time. Dürr’s activities in the area of energy efficiency and environmental technology have been combined under the Clean Technology Systems business unit since 2011.


Dürr is a mechanical and plant engineering group that holds leading positions in the world market in its areas of operation. It generates more than 80% of its sales in business with the automotive industry. It also supplies the aircraft, machinery, chemical, and pharmaceutical industries with innovative production and environmental technology. The Dürr Group operates in the market with four divisions: Paint and Assembly Systems plans and builds paint shops and final assembly plants for the automotive and aviation industries. Application Technology provides the automatic application of paint, sealants, and adhesives with its robot technologies. Machinery and systems from the Measuring and Process Systems division are used in balancing and cleaning, in engine and transmission manufacturing, and in final vehicle assembly, among other areas. The fourth division, Clean Technology Systems, is focused on processes to improve energy efficiency and on exhaust air purification. Dürr employs approx. 8,200 people at over 50 locations in 24 countries worldwide. In fiscal 2012 Dürr achieved sales of around € 2.4 bn.


Dürr Cyplan
Jochen Fink
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