NOVELTY - An engineered microorganism comprising polynucleotide sequences encoding: (a) a thioesterase (EC 3.1.1.5) or an acyl-acyl carrier protein (ACP) reductase polypeptide, (b) a fatty aldehyde biosynthetic polypeptide, and (c) a fatty alcohol biosynthetic polypeptide, is new. The expression of the polypeptides is modified relative to corresponding wild-type polypeptide, and the microorganism produces an increased titer of fatty acid derivative relative to a wild-type microorganism.    USE - The engineered microorganism is useful for producing fatty acid derivative, fatty alcohol and biofuel. The fatty alcohol is saturated fatty alcohol, 6-18C fatty alcohol or unsaturated fatty alcohol chosen from 1-10C, 1-12C, 1-14C, 1-16C and 1-18C. The microorganism is chosen from yeast cell, fungus cell, filamentous fungi cell and bacterial cell. The hydrocarbon is alkane or alkene. The alkane is chosen from 13-21C alkane, tridecane, methyl tridecane, nonadecane, methylnonadecane, heptadecane, methylheptadecane, pentadecane and methylpentadecane. The alkene is chosen from 13-22C alkene, pentadecene, heptadecene, methylpentadecene and methylheptadecene. The biofuel is diesel, gasoline or jet fuel (all claimed). The fatty alcohol is used in cosmetics, household products, detergents, wax, gum, resin, pharmaceutical salves, lotion, lubricating oil, textile antistatic, finishing agent, plasticizers, industrial solvent, solvent for fats and food industries as emulsifiers, emollients and thickeners. The aldehyde is useful for preparing polymers, resins, dyes, flavors, plasticizers, perfumes, pharmaceuticals and other chemicals.    ADVANTAGE - The method is cost-effective and environmentally-friendly, as it reduces accumulation of greenhouse gases and global warming.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) method (M1) for producing a fatty alcohol, involves culturing the engineered microorganism in presence of carbon source under conditions, where the fatty alcohol is produced at a titer of at least 300 mg/l;    (2) method (M2) for producing a hydrocarbon, involves performing the method (M1);    (3) hydrocarbon produced by method (M2); and    (4) biofuel comprising the hydrocarbon.