Hi,
I ended up short changing myself for time for supper--so I decided what the heck--and cooked myself another coffee pot egg.
This time I took the egg out at 20 minutes (it had been in the fridge at 40 f). Energy use according to my kill-a-watt was 0.08 of a kwh, so 80 watt hours. I did continue to test until 25 minutes had gone bye but the end result was still 0.08 kwh.
80 watt hours / 10 = 8 amp-hours.
For those of you who cook, the egg was barely done to soft boiled status. I think 21 minutes would be a better time--or if the egg had been at room temperature that also might have helped.