The city of Rancho Cordova, California, is in the process of a system-wide survey and analysis of the city’s existing streetlighting system. The evaluation is focused on spacing of streetlights, illumination, lighting orientation, and wattage. Once the final report is issued, city officials will be able to generate specifications for a full scale replacement of all city owned streetlights. Initial plans include the replacement of 4,700 existing streetlights with LED streetlight fixtures.
Rancho Cordova streetlights were previously owned and maintained by Sacramento County. Only recently, the city took full ownership of the system. As a result, officials became interested in exploring ways to save energy and costs. Recent analysis by city officials indicated that a conversion to solid-state streetlighting would result in energy cost savings of up to 60%. Approval of a 1% low interest loan from the California Energy Commission (CEC), enabled the city to begin planning the city-wide retrofit.
“Once the analysis is complete, we will be able generate specifications for the streetlight replacement project,” said David Gassaway, management analyst for the city of Rancho Cordova. The goal is to begin replacing the existing streetlight fixtures by mid-June 2013. Once the conversion is complete, the city is expecting to realize energy cost savings of up to 60%. “It’s important to understand that we are factoring in the wattage of the existing high pressure sodium (HPS) streetlight, but also the ballast. A 250 watt HPS streetlight might have a 40 watt ballast, so by switching to a 133 watt equivalent LED, energy consumption is reduced by at least 60%,” said Gassaway.
The current streetlight inventory includes about 4,134 HPS streetlights, and about 602 mercury vapor streetlights. The majority of the existing fixtures are cobrahead, with about 1,000 post-top fixtures. The wattage ranges from 100 watts to 400 watts.
A Request for Proposals (RFP) is expected to be issued in June 2013. The bid document will provide full project specifications including a list of approved LED streetlight fixtures.