Guadalajara, with a population ofapproximately 1.5 million, is the fourth largest city inMexico and is located in the country’s central Pacificregion. Until the implementation of the current streetlighting retrofit project, the city’s outdated streetlighting infrastructure had not been renovated in over 30years. Lighting crews could not keep up with outagesreported by citizens and there were many unlit areas aroundthe city. This coincided with increasing crime rates,leading to an overall lack of safety in the city. Theoutdated infrastructure also required substantial spendingon both maintenance and electricity for the streetlights.Street lighting represented approximately 18 percent ofelectricity consumption and paying for it was a significantcomponent of the city’s budget. To help Guadalajara andother cities address the problem, Mexico’s nationalgovernment established National Project for EnergyEfficiency and Public Municipal Lighting (Proyecto Nacionalde Eficiencia Energética en Alumbrado Público Municipal, orNational Public Lighting Program). The program provides asignificant amount of technical assistance to citiesembarking on LED public lighting projects. This case studysummarizes the implementation process of LED models forpublic lighting in Guadalajara.