Windy Kaukonahua Road will close from 8:30 a.m. to 3:30 p.m. today through Friday as the city converts streetlights along the Wahiawa-­North Shore thoroughfare to LED lamps from traditional lamps.

The conversion is the latest phase of the city’s two-year LED conversion project, which is expected to save the city $5 million annually in energy costs — by using 60 percent less energy — when the work is completed islandwide.

The contractor on the Kaukonahua phase is Johnson Controls Inc. The midday closures also will allow the city Department of Facility Maintenance to perform preventive maintenance on the streetlight poles, city officials said.

Motorists are urged to avoid the area, use alternate routes, allow for extra travel time and abide by posted traffic signs.

To date, Johnson Controls has completed converting more than 9,000 of the 53,000-plus installations, about 17 percent. Work, which began in March and is scheduled to run through fall 2019, is now concentrated in the Central Oahu, Ewa plain and Windward Oahu areas.

Johnson Controls is being paid $36.7 million through financing by First Hawaiian Bank, and the project is expected to pay for itself within a decade. The total cost of the project is $46.6 million when factoring in construction, financing and the warranty and network services over 10 years.

Go to the project website at myoahustreetlight.com to view traffic control plans for the affected areas.

Questions can be directed to Johnson Controls at 600-5877.