Earlier in the thread there were questions about Normalized Power (NP). NP is an algorithm created to estimate training stress/load created from given workouts, main sets, and races.
Without getting too technical, NP is supposed to do a good job of estimating what a person could perform for average wattage in a steady, iso-power effort.
Looking at NP over a short period of time can be dangerous to use as anything other than a data point, especially if the NP varies greatly from AP.
In a TT type effort, NP should be very close to AP. If the course is hilly, then NP might be 3-5% higher than AP.
I would be happy to further elaborate if anyone is interested and their eyes haven't glazed over yet.