Ambo Mineral water factory is one of energy consuming factories in this country. In the factory,rnthe thermal energy developed by the boiler goes to bottle washer and energy from electricity isrnused to power electrically driven equipments: electric motors and their driving systems, andrnlighting. According to 2018(G.C) energy bill data, the factory paid for both thermal energy (oil) andrnelectric energy 5,953,395.00 Birr and 1,008,685.00 Birr respectively. The energy consuming systemsrnof the factory such as electric motors, boilers, air compressors, water pumps and steam distributionrnsystems were audited. To perform the energy audit of these major energy consuming systems,rndifferent data (21-months, October,2017 to June, 2019 GC) were collected and analyzed by usingrnportable instruments, the instruments installed on systems, nameplate, referring factory log sheetrnwith the gross calorific value of 44,800kJ/kg of diesel oil. From the detail energy audit, by replacingrnthe existing electric motors and water pumps annual energy cost of around 46,000birr andrn128,700birr can be saved respectively. The energy audit of the boiler indicated that, its overallrnefficiency was 72.2% with possible energy conservation measures of repairing feed water treatmentrnplant(about 267,800Birr can be saved annually) and insulating boiler surface(26,300birr can bernsaved annually). Finally, the energy audit on steam distribution lines indicated as around 71,700 birrrncan be saved annually.