Dien Yoon is involved in energy efficiency (EE) and related policy development, business model development, ESCO project development and evaluation, and performance measurement and verification (M&V) in his capacity as General Manager of the Korea Association of ESCO (KAESCO). Established in 1999, KAESCO contributes to national economic growth, responds to climate change convention, facilitates the development of energy-saving markets through cooperation with ESCOs, and responds to the need for ESCO market reforms toward sustainable development. The areas of service include: ESCO Project evaluation and Performance Management, Business status industry average disclosure, Periodic hands-on training for the ESCO professionals, Research project about ESCO business, Legal system research and improvement activities, Provide and develop the technology to ESCO business, Training workshops and seminars to promote advanced energy-saving technology, Provide advertising and PR service for the development of ESCO industry, International Exchange and Cooperation