Smart street lighting : The advantages of LED street lighting and a smart control system in Uppsala municipality

Sammanfattning: The purpose of this bachelor thesis is to examine how LED street lights and a smart street light control system can reduce the energy consumption, costs and in extension the CO2 equivalents in a geographically delimited area. In 2015 the municipality of Sala installed LED armatures connected to a smart control system in the whole municipality. The smart control system enables for instance adjustment of the light intensity at specific times during the day and a supervision of the street light network. The LED lights high efficiency and the possibility to lower the intensity of the light reduced the energy consumption of the street lights in Sala with 77.8 %. LED lights have a longer life time compared to traditional street lights, which reduces the maintenance cost and the cost for purchasing new armatures. In this report the project in Sala is evaluated and the concept is used to investigate the advantages for a similar project in Uppsala municipality. The research goal is to develop a general model that examines the energy-, economic- and environmental savings when installing LED lights and a smart control system. One third of the armatures in Uppsala municipality have already been replaced with LED, therefore the simulations and calculations only includes the two thirds left. The results show that Uppsala municipality annually saves 79.2 % in energy and CO2 equivalents with a system like this and the economic savings during the life time of the armature is 182 MSEK, and the pay-off time is 6.9 years. A sensitivity analysis is carried out to verify the economic results by altering the electricity price. The analysis shows that the system used in Uppsala today is more sensitive to a varied electricity price than when a smart control system is installed.