The only tax on my Duke bill is a 3% state sales tax.
Which gets us nowhere near 11 cents/kWh.
So both the simple payback & IRR calculations are even worse than everyone's already calculated.
All of which also ignore maintenance & repair costs - IIRC, somebody's going to have to get up on the roof to swap out a failed micro-inverter.
said by dogma:
From the best I can figure, Duke Energy in North Carolina charges
For the first 350 kWh used per month: 9.2899¢ per kWh (excluding taxes which probably kicks it up to around 11¢ per kWh)