Savings Calculator Enter inputs in black. Outputs/results are in blue. Enter Assumptions: Average Daily Use, hours 3 Energy Star Assumption Compact Fluorescent Bulb life, hours 10,000 Most currently available CFLs are rated for 8,000 to 12,000 hours (dependin North Carolina Average Residential Electricity Rate (cents/kWh) 9.12 Energy Star data Pounds of Coal required to produce 1 kWh electricity: 0.963 0.963 derived from Energy Star assumptions for Coal emissions factor & Coal CO2 emissions factor (Pounds CO2/kWh coal generation): 2.06 2.06 from Energy Star assumptions NC-specific energy mix emissions factor (Pounds CO2 from overall fuel mix): See NC Electr. Sources & CO 2 tab 1.29 Annual Savings Coal Savings, pounds per year if 100% coal generatio n 47.45 81.20 Coal Savings, pounds per year assuming NC fuel mix 28.71 49.12 CO2 savings, pounds per year if 100% coal generatio n 101.51 173.69 CO2 savings, pounds per year assuming NC fuel mix 63.56 108.77
Replaced Bulb New Bulb Wattage wattage Wattage savings 60 15 45 100 23 77 Bulb Lifetime Savings
Annual kWh Energy saved per Cost year savings 49.28 $4.49 84.32 $7.69
Replaced Bulb New Bulb Wattage wattage Wattage savings 60 15 45 100 23 77 Years operation
kWh saved bulb lifetime 450 770
Lifetime Energy Cost Savings $41.04 $70.22
Coal Savings, pounds over CFL life if 100% coal generatio n 433.35 741.51
Coal Savings, pounds over CFL life assuming NC fuel mix 262.18 448.61
CO2 savings, pounds over CFL life if 100% coal generatio n 927.00 1586.20
CO2 savings, pounds over CFL life assuming NC fuel mix 580.50 993.30
Costs in $, Coal and CO2 Lifetime Pounds Coal used, assuming NC fuel mix 87.39 349.57 134.00 582.62
Daily hrs Bulb life operation hrs 3 10,000
Years operation Watts 9.13242 15 60 23 100
Bulb Lifetime "lifetime", kWh used Energy hrs lifetime Cost 10,000 150 $13.68 10,000 600 $54.72 10,000 230 $20.98 10,000 1,000 $91.20
Lifetime Pounds Coal used, if 100% coal generation 144.45 577.80 221.49 963.00
ted for 8,000 to 12,000 hours (depending on bulb)
Star assumptions for Coal emissions factor & carbon content
Energy Star assumptions See NC Electr. Sources & CO 2 tab
Lifetime Pounds CO2 generated , if 100% coal generation 309.00 1236.00 473.80 2060.00
Lifetime Pounds CO2 generated , assuming NC fuel mix 193.50 774.00 296.70 1290.00