In regions of Brazil with limited water availability, particularly the semi-arid Northeast, there is a growing need to identify sustainable biomass sources for energy. Although eucalyptus plantations are expanding in these areas, little is known about how reduced irrigation affects the physicochemical and energy properties of different genotypes. The objective of this study was to characterise the physicochemical and energy properties of wood from five eucalyptus clones grown under two irrigation regimes (12 and 36 months) in a semi-arid region of Northeastern Brazil, aiming to identify genotypes with superior energy performance. Discs (5.0 cm long) were collected at 0, 20, 40, 60, and 80% of the commercial height of the stem, defined as the portion with a minimum diameter of 6.0 cm. A completely randomised design was used, and Tukey's test (p <= 0.05) followed significant F test results. Basic density was statistically similar among clones under both regimes, but GG 702 showed one of the highest values (663 kgm(-)(3)). GG 702 recorded the highest energy density and fuel value index (4218.17) at 36 months. These results demonstrate the potential of selected eucalyptus clones for sustainable bioenergy production in water-limited environments.