Grid-tied solar owners will pay Duke the monthly minimum connection fee, regardless of surplus production. The Duke rate tariff schedule charges less per unit as your electricity usage increases. The first 300 kWh monthly is the most expensive. Your monthly bill is reduced by power produced with renewable energy. For example, if you used 900 kWh and produced 500 kWh with solar PV, the net bill would be for 400 kWh from the grid. The first 300 kWh would cost about $44 and the next 100 kWh would cost about $11 for a net metering bill of approximately $65 including the $9.40 connection fee.
Your electricity usage is seasonal with the lowest bills in spring and fall when heating and cooling are not needed. Solar energy peak production is from March to October. A solar PV system sized to offset most or all of your power in April and September will have the greatest benefit by reducing your monthly kWh below 300.
| Monthly energy kWh usage | Under 300 | 301 – 1000 | over 1,000 | ||
| Base rate per kWh | 0.092945 | 0.054178 | 0.037794 | ||
| Rider adjustment charges | 0.045177 | 0.045177 | 0.045177 | ||
| Electric charges total | $0.138122 | $0.099355 | $0.082971 | ||
| Sales tax 7% | $0.008652 | $0.005938 | $0.005258 | ||
| Cost per kWh | 0.147 | 0.105 | 0.088 | ||
Cost per kilowatt hour (kWh), including Indiana sales tax, is near 15 cents, 11 cents and 9 cents for each residential kWh rate tier, including base rate and riders.
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