Researchers compared different types of biobriquettes made from palm oil waste to see which one is the most effective as a fuel source. They found that biobriquettes made of TKKS charcoal are the best option because they have low water content and a high calorific value. Financially, all three types of biobriquettes are feasible to produce, but the coal-mixed TTKS charcoal biobriquettes are the most cost-effective choice.