Proximate and ultimate analyses are fundamental tools in assessing the suitability of biomass feedstocks for energy applications, as they provide essential information about the chemical composition, moisture content, and energy potential of different biomass materials. These analyses help in determining which biomass types are most appropriate for specific bio-energy applications such as combustion, gasification, pyrolysis, or biofuel production, thereby optimizing energy output and efficiency while minimizing operational challenges. Proximate analysis primarily measures the moisture content, volatile matter, fixed carbon, and ash content of a biomass feedstock. Moisture content is critical because high water content reduces the net calorific value of the biomass and increases energy consumption during drying. For instance, agricultural residues such as paddy straw or sugarcane bagasse often contain high moisture levels when freshly harvested, which may necessitate pre-drying before combustion in boilers or thermochemical conversion processes. Low-moisture feedstocks like wood chips or coconut shells are more suitable for direct combustion or gasification as they yield higher thermal efficiency and reduce transport energy costs. Volatile matter indicates the proportion of the feedstock that vaporizes at high temperatures and is readily combustible. Feedstocks with high volatile matter, such as sawdust or corn stover, are advantageous in processes like pyrolysis or gasification where rapid devolatilization is desired to produce bio-oil or syngas. In contrast, feedstocks with low volatile content, like mature hardwood, provide steadier combustion for thermal applications but may require higher temperatures for gasification. Fixed carbon represents the fraction of biomass that remains after volatile matter is released and is an indicator of the char formation potential. Feedstocks with high fixed carbon, such as bamboo or charcoal residues, are preferable for slow combustion applications or where solid carbon by-products like biochar are desirable for soil amendment or carbon sequestration. Ash content reflects the mineral residue remaining after complete combustion. High ash biomass, such as rice husk or sugarcane bagasse, can cause slagging and fouling in boilers, corrosion in gasifiers, and reduced thermal efficiency. Therefore, proximate analysis helps in eliminating unsuitable feedstocks for specific energy applications by highlighting moisture, volatility, carbon content, and ash characteristics. Ultimate analysis complements proximate analysis by providing a detailed breakdown of the elemental composition of biomass, including carbon (C), hydrogen (H), oxygen (O), nitrogen (N), sulfur (S), and sometimes trace elements. Carbon and hydrogen contents directly influence the higher heating value (HHV) of biomass, which is crucial for energy generation. Feedstocks with high carbon and hydrogen, like hardwood, coconut shells, or nutshells, yield higher calorific energy, making them suitable for combustion and co-firing in thermal power plants. Conversely, feedstocks with low carbon or