South Korean renewable-energy company specializing in geothermal, hydrothermal, solar, fuel-cell systems and lithium extraction technology.
Last updated September 28, 2026
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Overview
APTN (Korean: 앱튼) is a South Korean renewable-energy company headquartered in Seongnam, Gyeonggi-do, with a research institute in the same Pangyo Global Biz Center building and a factory in Osan. The company traces its origins to 2002, when it was established as Kotec Engineering Co., Ltd. (코텍엔지니어링㈜). Over more than two decades it has evolved through several corporate identities — Kotec Engineering, GN Energy (지엔원에너지), Geolrit Energy (지오릿에너지), AptNeuroScience (앱트뉴로사이언스), and finally APTN — reflecting repeated strategic shifts in its business focus. APTN's core business areas, as presented on its official website, are geothermal heating and cooling systems (GSHP), hydrothermal heating and cooling systems, solar photovoltaic power generation, fuel-cell systems, and lithium extraction. The company describes geothermal systems as an eco-friendly technology that uses underground temperature differences to absorb indoor heat in summer and supply underground heat indoors in winter. Its hydrothermal systems use the thermal energy of water, while its solar business converts sunlight directly into electricity via photovoltaic cells. Its fuel-cell systems produce electricity and heat (hot water) from hydrogen and oxygen using city gas. More recently, APTN has pursued lithium extraction, describing lithium as a key material for electric-vehicle batteries and positioning its extraction technology as environmentally friendly and economically efficient. APTN has a long track record in large-scale geothermal projects in South Korea. Its history page records the development of a 500RT-class large geothermal system at Sangam Nuri-kun SQ in 2006, the completion of South Korea's largest private geothermal system at the Second Lotte Super Tower in 2012, and entry into the U.S. military base geothermal market at Pyeongtaek in 2013. It also entered the horticultural geothermal market through a rural development project in 2012 and has worked on zero-energy city geothermal and hydrothermal designs. The company received a Presidential Commendation at the New & Renewable Energy Awards in 2010 and a Green Climate Award in 2013. APTN is a publicly listed company on KOSDAQ, having listed on March 9, 2020, when it was still named GN Energy. It was selected as a Green New Deal 100 company in 2020 for hydrothermal energy. The company has undergone significant ownership and leadership changes: it acquired GNC Energy in 2017, acquired Entutek and four other companies in 2022, and appointed co-CEOs Yoo Jae-hoon and Kim Dae-jin in 2022. In 2023 it changed its name to Geolrit Energy and invested in XtraLit, establishing an overseas subsidiary, Global Lithium Energy Corp. In 2025 it changed its name to AptNeuroScience and acquired Aprogen, with Kim Jae-seop appointed CEO. On July 25, 2025, an extraordinary shareholders' meeting approved a charter amendment changing the name from AptNeuroScience to APTN. Today APTN presents itself as a total energy solutions company, with a CI concept of "Total Energy Challenge" and a leaf motif symbolizing its eco-friendly total energy solution identity. Its website carries shareholder notices including an extraordinary shareholders' meeting notice for 2026, a stock consolidation notice, and its ninth fiscal year (2025) business report and audit report, indicating it remains an active, listed Korean company navigating a complex corporate history.
History
APTN's history begins in 2002 with the founding of Kotec Engineering Co., Ltd. (코텍엔지니어링㈜). The company established a technology research institute in 2003 and in 2005 signed a geothermal heat pump system technology agreement with U.S.-based Water Furnace. In 2006 it developed a 500RT-class large geothermal system at Sangam Nuri-kun SQ and registered as a specialized renewable-energy company in the geothermal (GSHP) sector, also obtaining ISO 9001 and ISO 14001 certifications. In 2009 it signed a geothermal heat pump supply contract with Germany's VIESSMANN. During its growth phase, APTN received a Presidential Commendation at the New & Renewable Energy Awards in 2010. In 2012 it developed geothermal technology for horticulture, entering the market through a Korea Rural Community Corporation glass greenhouse geothermal project, and completed South Korea's largest private geothermal system at the Second Lotte Super Tower. In 2013 it entered the U.S. military base geothermal market at Pyeongtaek and won an excellence award at the Korea Green Climate Awards. It received a technology award from the Korea Institute of Building Environmental Facility Engineers in 2016 and acquired GNC Energy in 2017. In its leap-forward phase, APTN expanded into new business areas. In 2018 it conducted geothermal system design services for LH apartment housing, responded to geothermal design for Gangnam redevelopment and reconstruction projects, and applied hydrothermal systems with K-Water. In 2019 it worked on zero-energy city geothermal and hydrothermal design and changed its name to GN Energy Co., Ltd. (지엔원에너지㈜). In 2020 it listed on KOSDAQ on March 9 and was selected as a Green New Deal 100 company for hydrothermal energy. In 2022 it acquired Entutek and four other companies and appointed Yoo Jae-hoon and Kim Dae-jin as co-CEOs. In 2023 it changed its name to Geolrit Energy, invested in XtraLit, and established an overseas subsidiary, Global Lithium Energy Corp. In 2025 it changed its name to AptNeuroScience Co., Ltd., acquired Aprogen, and appointed Kim Jae-seop as CEO. On July 25, 2025, an extraordinary shareholders' meeting approved a charter amendment changing the name from AptNeuroScience to APTN. The company's website continues to publish shareholder notices, including for a 2026 extraordinary shareholders' meeting and a stock consolidation.
- 2025
Changed name to AptNeuroScience Co., Ltd.; acquired Aprogen; appointed Kim Jae-seop as CEO; on July 25, extraordinary shareholders' meeting approved name change to APTN
- 2023
Changed name to Geolrit Energy; invested in XtraLit; established overseas subsidiary Global Lithium Energy Corp.
- 2022
Acquired Entutek and four other companies; appointed Yoo Jae-hoon and Kim Dae-jin as co-CEOs
- 2020
Listed on KOSDAQ (March 9); selected as Green New Deal 100 company for hydrothermal energy
- 2019
Worked on zero-energy city geothermal and hydrothermal design; changed name to GN Energy Co., Ltd. (지엔원에너지㈜)
- 2018
Conducted geothermal design services for LH apartment housing; applied hydrothermal systems with K-Water
- 2017
Acquired GNC Energy Co., Ltd.
- 2016
Received technology award from Korea Institute of Building Environmental Facility Engineers
- 2013
Entered U.S. military base geothermal market at Pyeongtaek; won excellence award at Korea Green Climate Awards
- 2012
Developed horticultural geothermal technology; completed South Korea's largest private geothermal system at Second Lotte Super Tower
Products and positioning
Eco-friendly total energy solutions provider, from geothermal and hydrothermal systems to solar, fuel cells, and lithium extraction.
Geothermal Heating and Cooling System
Uses underground temperature differences to absorb indoor heat in summer and supply underground heat indoors in winter.
Hydrothermal Heating and Cooling System
Uses the thermal energy of water to release building heat to water sources for cooling and extract heat from water sources for heating.
Solar Energy System
Photovoltaic power generation that directly converts sunlight into electricity using solar cells.
Fuel Cell System
Electrochemical device producing electricity from hydrogen and oxygen; uses city gas to co-produce electricity and heat (hot water).
Lithium Extraction
Environmentally friendly and economically efficient lithium extraction technology; lithium is a key material for EV batteries.
Sources6 sources
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