Keith wrote:
"How does Terman first write of the power in these waves?"

I don`t remember chapter and verse anymore. So, I can`t say where Terman
first writes of power in these waves. On page 88 of Terman`s 1955
edition he says:
"At radio frequencies it is nearly always permissible to assume that
omega L R, and omega C G. To the extent that it is true, one can
rewrite Eqs. (4-5) and (4-7) as follows:
Zo = sq rt L/C

This means current is in-phase with voltage in the waves in both
directions.

In-phase volts and amps are real power, not apparent power.

Best regards, Richard Harrison, KB5WZI