The population has increased and resulted in an increase in the demand for energy sources and various types of waste. Palm oil fronds and stems are a type of solid waste which numbers are increasing rapidly due to the expansion of palm oil agriculture. Eco-energy can be used by knowing the water content and ash content. Therefore, the purpose of this study is to determine the water content and ash content of the fronds and stems of palm oil as eco-energy briquettes. The method of this research is an experimental research method starting from the collection of raw materials, drying, testing the water content and testing the ash content. From the results of the study it was found that with a ratio between fronds and palm oil stems, namely 1:1, the water content is 0.21% and the ash content iss 0.30%; a ratio of 1:2 means a water content of 0.23% and an ash content of 0.27%; a ratio of 1:3 means a water content of 0.20% and an ash content of 0.25%; a ratio of 2:1 means a water content of 0.22% and an ash content of 0.29%. All of the briquettes comply with SNI (Indonesian National Standard) where the water content of the briquettes according to SNI (SNI 01-6235-2000) is a maximum of 8% and a maximum briquette ash content of 8%.