Roy Lewallen wrote:
"A better reason to avoid "stored" is that power isn`t stored at all,
anywhere. Anyone who believes so should be able to tell us how many
watts are stored in a 50 Ah, 12 volt battery."

The 50 Ah of energy stored in a battery may be withdrawn at a rate
determined by the load, so it is a variable.

Velocity in a transmission line is a constant determined by
constructtion of the line. Thus, energy stored in the line is determined
by its length, voltage, current, and phase angle. These predict the rate
of energy transfer (power).

Best regards, Richard Harrison, KB5WZI