Power plant - Cheong Soo - South Korea

Cheong Soo + Wärtsilä

Introducing trigeneration in Cheong Soo

In May 2007, Wärtsilä was awarded a contract from JB Enertek Co., Ltd., South Korea, to deliver engineering and equipment (EEQ) in two phases for a 25.3 MWe combined heat and power plant (CHP).

The plant is located in Cheong Soo community in Cheon Ahn City, approximately 100 kilometres south of Seoul, Korea. The purpose of the Cheong Soo trigeneration plant is to provide district heating and electricity to a suburban area covering approximately three square kilometres with about 6400 households and public buildings. The first phase of the project comprised two Wärtsilä 20V34SG natural gas-fuelled generating sets equipped with a heat recovery system for district heating purposes. Phase 1 was commissioned and handed over in February 2010. The second phase consists of an identical genset to the previous and is scheduled to be completed in 2015. The three gensets generate electricity in parallel with the electrical grid and supply district heating to the town network.

During the warm summer periods the plant provides district cooling as well. Due to tariff policy in South Korea, selling only electrical power to the grid is not feasible. At night, the electrical load in the suburban area is so low that the amount of heat generated by the engines at this time is significantly reduced compared to daytime. Unfortunately, the amount of heat needed by households during this period of time in the 24-hour cycle is at its maximum. This is why installing a heat accumulator comes into question: it allows the Cheong Soo plant – operating essentially in island mode – to run continuously on high load and thus, at high levels of total efficiency (more than 85% in this case). The additional heat generated during daytime is partly stored in the accumulator for use during the following night.

This was the first CHP project delivered by Wärtsilä in South Korea under the CES (Community Energy System) concept which is based on South Korean legislation to encourage decentralized energy production. The objective of the CES concept is to supply electricity and heat from independent power production facilities to commercial, residential, business and hospital buildings in specific areas.

After the completion of the second phase, the total electrical output of the plant will be raised to 25 MWe and thermal output to 21 MWth. Wärtsilä designs, procures and delivers the equipment as well as provides technical advisory services at site during the installation and commissioning works. The erection and installation of the equipment is carried out by JB Enertek and local contractors.

WHOJB Enertek Co., Ltd
WHAT 2 x Wärtsilä 20V34SG & 1 x Wärtsilä 20V34SG Flexible Baseload
WHERECheong Soo, South Korea
HOWEEQ (Engineered equipment delivery)


This is what we achieved


MW of electrical output


MW of district heating output


Total operating efficiency

Cheong Soo CHP is the most successful engine plant in South Korea and we are very proud to supply power and heat to our customer by using Wärtsilä 20V34SG engines.

- Mr DP Lee, Gas Equipment 1 Team, Sales Manager, JB Enertek Co., Ltd.

How we did it

Challenge icon


  • Electrical load minimal but head demand maximum at night
  • Electricity generation parallel to the grid
  • Meeting the noise level and emission requirements set by Korean legislation
Solution icon


  • Charging of heat accumulators during daytime and consumption of heat at night
  • Wärtsilä 34SG gensets provide continuous and reliable energy
  • Advanced emissions and noise reduction equipment were installed
Benefit icon


  • Minimum 85% efficiency 24 hours a day
  • Avoiding the costs of installing external site connections 
  • Compliance with regulations allows plant to operate efficiently and avoid potential penalties

The main details

   Customer  JB Enertek Co., Ltd (IPP)
   Type  Wärtsilä 34SG gas trigeneration power plant
   Operating mode  Flexible baseload
   Gensets  2 x Wärtsilä 20V34SG & 1 x Wärtsilä 20V34SG
   Total output  25 MWe + 21 MWth 
   Fuel  Natural gas
   Scope  EEQ (Engineered Equipment Delivery)
   Delivered  2010 & 2015
Cheongsoo map

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Related press releases

Wärtsilä gas-engines for a power plant for Korean community energy system (CES) project

Dec 17, 2014, 00:44 AM by Wärtsilä Corporation

Wärtsilä was awarded a contract in May 2007 from JB Entech Co Ltd, Korea, to deliver engineering and equipment for a 25.3 MWe combined heat and power plant (CHP) for the Cheong Soo community in Cheon Ahn City in Korea.

This is Wärtsilä’s first CHP project in Korea under the CES (Community Energy System) concept. CES is a concept based on South Korean government legislation to encourage decentralized energy production. The CES aims to supply heat and electricity from independent heat and power production facilities to residential, commercial, and business buildings, together with hospitals, and other facilities that are concentrated in a specific area.

Wärtsilä will deliver the equipment  for the Cheong Soo plant in two phases. The first phase requires two Wärtsilä 20V34SG gas-engined generating sets with a combined electrical output of 17 MWe. Waste heat recovery from these engines will provide 14 MWth of thermal energy for district heating and cooling.

In the second phase, Wärtsilä will deliver a third identical generating set, raising the total electrical output to 25 MWe and the thermal output to 21 MWth.

The plant is being installed by JB Entech Co Ltd, the engineering and supply company of its parent company Jung Bu City Gas Co Ltd. The first phase of the Cheong Soo plant is due to be operational in the second half of 2009, and the second phase around mid 2012.

The plant will burn natural gas and will produce electricity, heat and cooling for the Cheong Soo community. The community will thus benefit throughout the year of the high total efficiency of the CHP plant.

The Cheong Soo gas power plant will be equipped with advanced emission- and noise reduction equipment.

Wärtsilä in brief:

Wärtsilä enhances the business of its customers by providing them with complete lifecycle power solutions. When creating better and environmentally compatible technologies, Wärtsilä focuses on the marine and energy markets with products and solutions as well as services. Through innovative products and services, Wärtsilä sets out to be the most valued business partner of all its customers. This is achieved by the dedication of more than 14,000 professionals manning 130 Wärtsilä locations in close to 70 countries around the world.



For further information, please contact:
Maria Nystrand
Public Relations Manager, Power Plants
Wärtsilä Corporation
Direct tel: +358 10 709 1456
Direct fax: +358 10 709 1425
e-mail: maria.nystrand@wartsila.com
Internet: www.wartsila.com

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