Since 2005/2006, Dr. Rachmawan has been lecturing on subjects such as energy conservation, wind energy, hydropower, renewable energy technology, and energy policy, with a focus on integrating renewable energy. From 2005 to 2016, Dr. Rachmawan participated in at least 44 programs across 53 sites, covering hydropower, solar energy, bioenergy, geothermal, ocean energy, hybrid energy, green building, industrial energy audits, natural gas, and nuclear power plant development guidelines in Indonesia.
Dr. Rachmawan has also been involved in renewable energy and sustainable development programs funded by international sources, including Korindo (South Korea), GTZ/GIZ (Germany), JICA (Japan), SIDA (Sweden), USAID (United States), MCAI (United States), Non-Aligned Movement – Centre for South-South Technical Cooperation (NAM CSSTC), Shizuoka University (Japan), and the Australia-Indonesia Centre (AIC).