Since 2005/2006, Dr. Rachmawan gives lectures for instance in energy conservation, wind energy, hydropower, introduction to technology of renewable energy, and energy policy (further: integration of renewable energy). In period of 2005-2016, Dr. Rachmawan was involved in at least 44 programs in 53 sites of hydropower, solar energy, bioenergy, geothermal, ocean energy, hybrid energy, green building, energy audit for industry, natural gas, and guidelines for development of nuclear power plant in Indonesia. In renewable energy and sustainable development, Dr. Rachmawan was/is involved in programs funded by International sources (Korindo – South Korea, GTZ/GIZ – Germany, JICA – Japan, SIDA – Sweden, USAID – United States, MCAI – United States, Non Aligned Movement – Centre for South-South Technical Coop (NAM CSSTC), Shizuoka University – Japan, and Australia – Indonesia Centre (AIC).