Development and Infrastructure
Sustainable development encourages economic growth and development while conserving resources in the long-term interest of individuals, the community and our ecosystem. Key elements of sustainable development include thoughtful land planning, protecting land and ecosystems and using natural resources wisely. Naperville’s sustainable infrastructure includes sanitary sewer lining, storm sewer maintenance, flood and storm water improvements and tree preservation and protection measures.
LED Light Installation
Naperville completed full conversion of 11,024 City streetlights from high pressure sodium (HPS) to light emitting diode (LED) bulbs in 2017. The conversion reduces energy usage, re-lamping fees and maintenance costs. The projected is estimated to save $4.56 million over 10 years with payback starting after nearly six years. LEDs are rated for 50,000 hours, or approximately 15 years, which far exceeds the previously used HPS lights that ranged from 70 to 400 watts with a life expectancy of 10,000 hours, or three to four years.
The re-lamping project began in 2015 and was divided into three annual stages. The first stage replaced 1,550 fixtures on arterial streets and was completed in April 2015. The phase cost $680,200. The second phase was completed in March 2016 and replaced 6,700 residential street lights. Naperville completed the project in early 2017, upgrading 2,700 specialty streetlights along pedestrian paths and parking lots. The project was initially approved under a five-year plan in 2011. However, a decline in prices and improvements in LED technology expedited the project to three years and increased estimated savings. The project cost the City approximately $1.65 million, $3.05 million less than the $4.70 million initially projected under the five-year plan.
The LED fixtures will save the City approximately 1.7 million in kilowatt-hours annually, which will save $75,000 per year. According to the U.S. Energy Information Administration, the average electricity consumption for U.S. residential utility customers was 10,908 kilowatt hours. The arterial conversion saves enough energy to power nearly 155 homes each year. The LED lights are projected to reduce annual electric costs by $210,808, annual maintenance by $339,517 and annual re-lamping services by $91,885.
The project allows Naperville to be a leader in technology innovation; improve visibility, safety, and reduce light pollution; reduce environmental impact through energy reduction; and provide the City maintenance and energy consumption savings.
Storm Sewer Maintenance
The Department of Public Works handles ongoing and emergency stormwater management projects for the City. These projects are designed to control erosion, stormwater system failures and localized flooding. Projects include structure rebuilding and repairs, pipe-lining, reconstruction, patch work and open drainage repairs and cleaning.
Arbor Day Tree Sale
The Department of Public Works hosts an annual Arbor Day Tree Sale. Measuring the impact of the tree sale is not simply a matter of dollars and cents. Trees provide a number of benefits including reduction in CO2 gas, energy savings due to the cooling effect of trees, reduced stormwater runoff and improved aesthetics. Using the National Tree Benefits Calculator, the impact of the Naperville Arbor Day Tree Sales held since 2010 can be seen in the table at left. This data represents less than half of the overall tree sale efforts, which started back in 1990.
Emerald Ash Borer
Emerald Ash Borer (EAB) is an invasive pest that kills ash trees, which are native to Illinois and commonplace in Naperville. The beetle was first found in Naperville in 2008, at which time Naperville had more than 16,000 parkway ash trees and an estimated 50,000 ash trees on private property. Learn more about the City's containment strategy enacted in 2009 to slow or stop the spread of EAB.