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LED Street Lights

Alliant Energy is in the process of replacing its high-pressure sodium (HPS) streetlights with LED lights in its electric service communities in Iowa. Alliant Energy started testing the LED lights in 2012, and started a statewide replacement program in 2013. Because many of the HPS lights still have useful life, they won’t be replaced until they need service, which averages every 5-7 years.

The two pictures on the right provide a comparison on the effect of LED lighting on streets.

Below is a list of frequently asked questions regarding LED streetlights. Please contact your community representative if you have any questions not addressed here.

Why is Alliant Energy switching to LED streetlights now?
Alliant Energy has been working to find a more energy-efficient street lighting option for customers for several years. Before now, the combined costs of energy use, hardware, and maintenance was more than the current high-pressure sodium (HPS) lights. As technology has developed, the combined costs of LED lights have dropped, making them a viable alternative.

When is Alliant Energy switching to LED streetlights?
Alliant Energy crews in Iowa started the switch on January 6, 2013.

Where is Alliant Energy switching to LED streetlights?
At this time, Alliant Energy is only making this switch in its electric communities in Iowa.

How much will a community save with LED streetlights?
When using energy prices in 2012, it is estimated that each 80-watt LED streetlight will save a community approximately $0.68 a month in energy costs. The tariff costs for these lights will remain the same as the current HPS lights. While the LED fixture is more expensive than HPS lights, the monthly energy costs and lifetime maintenance costs are lower, which results in the overall savings.

Are you replacing all of our streetlights with this switch?
Right now, we only have plans to change out the 100-watt arm mounted HPS streetlights. We are still studying to find the best replacement for higher wattage HPS lights and for post-top mounted, decorative HPS lights.

Are you replacing all of the HPS lights at the same time?
We are replacing HPS lights with LED units only when the HPS requires maintenance. We expect to replace all of the selected HPS lights in 7-9 years.

Are there any negative effects from having both HPS and LED streetlights on the same road?
Drivers in our test pilot communities have not reported any issues. Often, parking lots and other businesses have LED lights, which are already combining with current street lights.

What should I do when I see a streetlight that is no longer working?

If a streetlight needs repair, please submit a repair request by either filling out an online form at www.alliantenergy.com/streetlights or by calling 1-800-ALLIANT (800-255-4268).

Will I notice a difference on the road?
Many people in the communities where the LED were first piloted reported very positive changes on the roads. The LED light is white, more defined, and sharper than HPS lights. The light is directed more on the street and allows the human eye to see details and colors better than the yellowish HPS lights. The photos above illustrate the difference in lighting.