Ivan Ramljak, Ivana Ramljak, Mijo Sesar

Street lighting systems today are important consumers of electrical energy. Those systems are also not negligible producers of CO2. Because of that, great efforts are made (especially today) to find optimal solutions to save electrical energy in street lighting. In this paper, we give a literature review in the fields of street lighting energy audit and possibilities of electrical energy savings in street lighting. Then, a case study report of the city of Široki Brijeg (Bosnia and Herzegovina) is analyzed. In this case study, one energy audit method is described and applied. After that, several scenario strategies of electrical energy savings based on reconstruction of existing street lighting systems are described and applied, too. As a result, we noticed that high electrical energy savings can be obtained by using optimally sized sodium luminaires or sodium luminaires with step-dimming ballasts. That conclusion was made after the proposed energy audit was done and the proposed scenario strategies of electrical energy savings were examined. The workflow presented here can be used for any case study.
street lighting, energy audit, electrical energy saving, case study report