Prosopis juliflora is an invasive plant species rapidly expanding in the Asian and African continents. Invasion of P. juliflora in Bundala Ramsar Wetland (BRW) in Sri Lanka has created a number of biodiversity and conservation issues. This study was conducted to assess the possibility to utilize this invasive plant as a fuel source for local industries. The moisture content, wood density, ash content, volatile matter, fixed carbon content, biomass/ash ration and calorific value of P. juliflora were measured and compared with Leucaena leucocephala, which is a widely used fuelwood source in Sri Lanka and elsewhere. P. juliflora , performed better than L. leucocephala for most of these parameters. Ash content was comparatively higher in P. juliflora than that of L. leucocephala ; however, biomass to ash ratio of P. juliflora was significantly lower (at 0.05 level of significance) than that of L. leucocephala, suggesting its suitability as a fuelwood source. Further, the fuel value index of P. juliflora (3,276) was slightly lower than that of L. leucocephala (3,336), a non-significant difference. P. juliflora and L. leucocephala reached Fiber Saturation Point values within drying periods of 24 and 27 days, respectively. According to our estimates of energy properties, 1 Kg of P. juliflora could be used to substitute 0.5 L of diesel and furnace oil as well as 5 kWh (5 units) of electricity. As such, we recommend harvesting P. juliflora from BRW as a potential fuelwood energy source for local industries.