환경 엔지니어링
- KC코트렐㈜
- KC에어필터텍㈜
- KC Cottrell Taiwan Co., Ltd.
- KC Cottrell India Pvt. Ltd.
- KC Energy Technology Co., L:td.
- 유양기술㈜
- ㈜이천뉴파워
- 놀텍코리아㈜
- KCVCS㈜
- KC Africa (Pty) Ltd.
- KCA Power Service (Pty) Ltd.
- KC Cottrell Engineering Service Pvt., Ltd.
- Changchun KC Envirotech Co., Ltd.
- KC Cottrell Vietnam Co., Ltd.
- Lodge Cottrell Ltd.(UK)
- NOL-TEC Systems Inc. (US)
- Nol-tec Systems(Shanghai) Co., Ltd
- 엔더블유엘퍼시픽㈜
- KC Envirotech E&C Co., Ltd.
환경서비스
- KC환경서비스
- KC체화제과기(북경)유한공사
- KC환경개발㈜
- KC에코사이클㈜
- 음성바이오칩스㈜
- 성주바이오칩스㈜
- KC그린에너지㈜
- KC바이오자원㈜
- KC에코물류㈜
- KC그린소재㈜
- 삼척에코건자재㈜
친환경제조
- KC글라스㈜
- KC유리자원㈜
- Clestra Hauserman SA
- Mecanalu SAS
- Clestra Inc
- Clestra Hauserman Overseas Contracting
-
Clestra International SAS
- Clestra Ltd.
- Clestra GMBH
- Clestra Hauserman Ltd.
- Clestra SA – Switzerland
- ㈜클레스트라하우저만
- Clestra Ltd.
- Clestra KK.
- CLESTRA Hauserman Architecture
- Product Co., Ltd.
신재생 에너지
- KC솔라&에너지㈜