Duke Energy Savings Store
Energy-saving bulbs are a smart choice.
Buying them from us is an even smarter one.
How much money can I save:
Buying from the Duke Energy Store?
On my Duke Energy
? / year
What size is your home?Select your square footage
- 1,000 or less sq. ft. home
- 1,001-1,500 sq. ft. home
- 1,501-2,000 sq. ft. home
- 2,001-2,500 sq. ft. home
The average home that's less than 1,000 sq. ft. has approximately:
How sustainable can I be:
By replacing bulbs with CFLs?
That's equal to the amount of CO2 offset by planting:? trees
About this feature
By using the drop down menu to select the approximate square footage of your home, this calculator shows you how much you can save—both in dollars and in carbon pollution. On the left, you’ll see how much money you can save by purchasing your home’s bulbs at the Duke Energy online efficiency bulb store today and how much money that will save you on your Duke Energy bill over the course of a year. On the right, you’ll see how much carbon you can prevent from entering the environment by switching to energy-efficient lighting throughout your household. We’ve even calculated how many trees would have to be planted in order to offset that same amount of carbon—just to help put it in perspective.
The following sources were used to calculate these savings.
- The average square footage and associated number of light bulbs is based on the 2010 U.S. Lighting Market Characterization report released by the U.S. Department of Energy. The breakout of types of bulbs (dimmable, three-way, capsule, candelabra, globe and reflector) is based on assumptions of where these types of bulbs are used in the rooms listed in the same lighting report.
- The average retail savings for customers purchasing bulbs through Duke Energy’s energy efficiency store is based on calculating average savings of 14 bulbs offered through the store as of October 2012.
- The average electric bill money savings is based on ENERGY STAR’s reported savings in electricity costs over the lifetime of a compact fluorescent light (CFL) bulb, and based on the CFL bulb lifetime being 8,000 hours. Hours of use reflect the lifetime of a standard CFL bulb and not the lifetime of a three-way or dimmable CFL. We assumed that the average CFL is used 3 hours per day.
- The average amount of carbon saved is based on ENERGY STAR’s reported savings in pounds of carbon dioxide per average CFL bulb, and based on the CFL bulb lifetime being 8,000 hours. Hours of use reflect the lifetime of a standard CFL bulb and not the lifetime of a three-way or dimmable CFL. We assumed that the average CFL is used 3 hours per day.
- The comparison of the amount of CO2 offset with amount of trees planted is based on the Environmental Protection Agency (EPA) Greenhouse Gas Equivalencies Calculator. The equivalency result used is the amount of carbon sequestered by tree seedlings grown for 10 years.
All figures were rounded to the nearest hundredth or dollar.
Updated August 2012