The ability of East Manggarai Regency to meet the electricity needs of the region is estimated at only44.91%. This metter is caused by natural conditions that have a dry climate and critical land, making it difficult tocan improve of community economy and generaly region for development of adequate electricity. Therefore, theelectrical energi need has been to development challenge, while fossil energi untenable. The construction of abiomass from the Gamal (Gliricidia sepium) plant is a potential alternative to develop. This research aimed toidentify the potential lands for Gamal and predict the electricity potency. The method was image analysis from CitraTM 8 using GIS Version 10.1 as an analysis tool. Collecting data was through community interviews with purposivesampling method. The results of this study described the degraded land areas of 187.462,01 hectares which are thepotential land for Gamal planting. Prediction of critical lands could produce 98 181.76 m3 of wood products andgenerate 18.90 MW / year of electricity.