• DALC Staff

How CLEA-N Calculated Energy Savings for the LED Exchange

Here is the EPA link and the formula used to calculate the annual reduction in carbon emissions:

37.2 kWh/bulb/year x 1,558.8 pounds CO2/MWh delivered electricity x 1 MWh/1,000 kWh x 1 metric ton/2,204.6 lbs = 2.63 x 10-2 metric tons CO2/bulb replaced

With the new updated numbers, the calculation is as follows: .0263 x 7500=197.25 metric tons.


Bottom Line...Since November, CLEA-N has delivered 7,500 LED bulbs to 1,100 households, which over the life of the bulbs, will reduce utility costs by over $550,000.

Here's how we calculate the cost savings on utility bills.

- Each LED bulb uses just 11 watts of energy but is 75 watt equivalent.

- Each LED bulb is expected to last 15,000 hours, or 13.6 years at 3 hours per day.

- Our Alliant Energy bill shows our local rate is $.1166/kWh.

- We used an online energy cost calculator, with 3 hours per day per bulb.

- 75 watts of energy (with incandescent) would cost $9.58 to operate a bulb for a year.

- 18 watts (75 watt equivalent CFL) would cost $2.30 to operate a bulb for a year.

- 11 watts (75 watt equivalent LED) would cost $1.41 to operate a bulb for a year.

- Since CLEA-N launched, we have impacted just over 1,100 households, with just over 7,500 bulbs given out.

When we did the swap/exchange portion of the project, we saw 64% incandescent and 36% CFL exchanged. Assuming that ratio holds true across all the households...

- 64 Watts (reduction/savings on incandescent to LED) is saving $8.18 per year.

- 7 Watts (reduction/savings on CFL to LED) is saving $0.89 per year.

- Energy cost savings for incandescent replacements is calculated at $534,000.

- Energy cost savings for CFL replacements is calculated at $32,000.

Therefore, we estimate the total cost savings, over the life of the LED bulbs, for the folks who received LED bulbs from CLEA-N, is over $550,000!!

1 view0 comments

Recent Posts

See All

Driftless Area Land Conservancy

206 S. Iowa Street (map)

Dodgeville, Wisconsin 53533

Email us

(608) 930-3252

Driftless Area Land Conservancy is an accredited non-profit land trust in Southwest Wisconsin. All images and text on this site are property of Driftless Area Land Conservancy and/or are being used with permission from the authors and photographers. Please do not share or distribute text, images or any site content without expressed, written permission. We take your privacy seriously and will not distribute or sell any information gathered here on contact, registration, volunteer or donation forms. 

  • Facebook
  • YouTube
  • Instagram
  • Amazon Social Icon