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The global energy crisis and climate change are driving the development of biodiesel as a renewable energy source. Graphite as an additive shows significant potential in improving the efficiency and reducing emissions of biodiesel. This study maps graphite-biodiesel research in Southeast Asia using a meta analysis of systematic reviews of 68 publications from Scopus, Web of Science, and ScienceDirect from 2015-2024. The results show that Malaysia leads in publication contributions (32%), followed by Thailand (28%) and Indonesia (18%). The optimal graphite concentration of 50 ppm increases brake thermal efficiency by 8.3% and reduces CO (15.7%), HC (12.4%), and smoke (18.9%) emissions, although there is an increase in NOx (6.8%). Palm oil methyl ester dominated the research (56%). Indonesia has strategic opportunities with abundant feedstock and graphite deposits, but faces challenges in research infrastructure, limited international collaboration, and the absence of an integrated national roadmap. Infrastructure investment, human resource strengthening, and industry academia collaboration are needed to accelerate national biodiesel research.

An environmentally friendly fuel with great potential for use in transportation and industry is B40 biodiesel. It is a mixture of 60% diesel and 40% biodiesel. With an emphasis on engine performance, environmental impact, and financial incentives, the study assesses how beneficial its use can be. According to the findings, B40 biodiesel burns better and produces fewer carbon emissions compared to pure diesel because it has a higher cetane number. However, fuel consumption may increase due to the much lower energy content of biodiesel. B40 requires more maintenance to avoid hygroscopic effects, but it has been shown to improve lubrication and support heavy equipment operations in industrial environments. Implementing B40 has several benefits, including the ability to reduce greenhouse gas emissions.  

Energy is an essential requirement for civilisation, and due to the rapid expansion of the population in Indonesia, energy consumption has also experienced a substantial rise. Hence, it is crucial to utilise and enhance the capacity of sustainable energy resources present across the archipelago, including geothermal, hydropower, wind, bioenergy (including bioethanol, biodiesel, and biomass), ocean current energy, nuclear, and solar energy. Indonesia's energy strategy is currently focused on the use of renewable energy to decrease carbon emissions. This is backed by legislation that promotes the development of renewable energy programs under the National Energy strategy. This article evaluates the regulatory factors associated with the advancement of new renewable energy and its influence on the establishment of sustainable energy infrastructure in Indonesia. This research provides a comprehensive legal analysis of the changing regulations surrounding renewable energy. It examines how these regulations affect the establishment of sustainable energy infrastructure and investigates the current legal consequences. The study aims to understand how the regulatory framework can either support or impede the progress of renewable energy development. This research offers valuable insights on the role of legislation in facilitating the shift towards sustainable energy sources in Indonesia. It also sheds light on the potential obstacles and advantages that may arise during this transition.

The Indonesian government is enthusiastic about continuing the biodiesel program as one of the new and renewable energy mandatory programs which has proven to be able to provide many benefits ranging from achieving environmentally friendly energy, saving state foreign exchange, increasing energy security, to providing jobs; in line with the 7th principle of sustainable development goals (SDGs). In fact, the Indonesian government has increased the B30 Biodiesel program in 2020 to B35 in 2023. It is supported by the Palm Oil Plantation Fund Management Agency (BPDPKS), which has the authority to collect CPO export levy funds and redistribute them to biodiesel producers, so that they can produce biodiesel economically. With this mechanism, the Biodiesel program can be implemented even though the price of biodiesel is more expensive than fossil fuels, but does not burden the State Budget (APBN). However, this program is difficult to increase, because the availability of incentive funds is limited by the amount of CPO exported and the amount of the levy. The Ministry of Energy and Mineral Resources (ESDM) must find a way for the biodiesel energy program to achieve the 23% energy mix target in 2045, and not rely on export fund levies anymore.