Beyond the Blend: A Review of the Systemic Challenges to Implementing Indonesia's B50 Biodiesel Programme
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Indonesia's mandatory B50 biodiesel programme, officially launched in July 2026, represents one of the world's most ambitious attempts to substitute petroleum diesel with a domestically produced biofuel. The policy is intended to strengthen energy security, reduce diesel imports, deepen palm-oil downstreaming, support rural livelihoods, and lower greenhouse-gas emissions. Yet moving from B40 to B50 changes more than the blending ratio. It increases the coupling between the national energy system and the palm-oil economy, thereby intensifying interactions among feedstock availability, plantation productivity, smallholder replanting, crude palm oil (CPO) allocation, commodity prices, biodiesel quality, storage and distribution infrastructure, engine compatibility, fiscal support, environmental safeguards, traceability, and international trade rules. This article conducts a qualitative integrative literature review, rather than a systematic literature review, drawing primarily on peer-reviewed studies published from 2020 to 2026 and triangulating them with current government sources. The review identifies nine interconnected challenge domains and argues that the principal risk is not any single bottleneck but the migration of bottlenecks across the upstream-to-downstream system. B50 can improve energy resilience, but its durability depends on productivity-led feedstock growth, smallholder-inclusive replanting, end-to-end fuel-quality assurance, resilient financing, credible lifecycle sustainability, and adaptive governance. The article proposes a policy architecture in which the mandate is supported by monitored thresholds for feedstock, prices, fiscal exposure, technical performance, distribution reliability, and environmental integrity.
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