NOVELTY - An oleaginous bacterial cell, where genes encoding at least one endocellulase, exocellulase and cellobiase activity operably linked to a promoter sequence have been introduced, is new.    USE - For the production of lipid (claimed) as raw materials for production of biofuels such as biodiesel, renewable diesel and bio jet fuel.    ADVANTAGE - The oleaginous bacterial cell provides lipid using renewable low cost substrate, especially cellulosic substrate; allows consolidated bioprocessing of cellulosic materials for production of single cell oil for biofuels. It omits or decreases the use of externally produced enzymes and can result in significant improvements in cost-efficiency.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: 1) new oleaginous bacterial cell, where a gene encoding cellobiase activity operably linked to a promoter sequence have been introduced into Rhodococcus opacus PD630 cell; and 2) production of lipid involving method (M1) involving: (1a) providing a culturing medium where at least part of the carbon source is in cellulosic form; (2a) providing a bacterial strain capable of expressing and secreting at least one cellulolytic activity/cellulolytic activities; (3a) contacting the medium and the strain; (4a) cultivating the medium and the strain in conditions allowing expression of the cellulolytic activities; (5a) providing (i) the cellulolytic bacterial strain of step (2a) being oleaginous, or (ii) another oleaginous bacterial strain genetically modified to use cellobiose as a carbon source; (6) contacting the culturing medium of the step (3a) or the spent culturing medium obtained from step (3a) with the strain; (7a) cultivating the strain in conditions allowing lipid production; and (8a) recovering the lipids; or method (M2) involving: contacting the cells of an oleaginous bacterial strain, where genes encoding at least one cellobiase activity and optionally cellobiose sugar transporter(s) operably linked to a promoter sequence have been introduced, with a culture medium where at least part of the carbon source is cellobiose, preferably cellobiose from hydrolysis of cellulosic substrate; cultivating the cells of the bacterial strain in conditions allowing the lipid production; and recovering the lipids.