V'Ger's field is "twelve
power," which is more than ten thousand starships may
generate; the force field generated by V'Ger is also greater in power
than the sun; nevertheless, a self-destruct sequence is expected to
This suggests starship power generation in the TMP era to be no higher than 40 zettawatts, by using the context of 10,000 starships compared with the power generation of a sun.
STVIII: A small cell about the size of a calculator battery may provide emergency power to a 21st century hospital for several hours.
This suggests between 0.1-1 MW of power, and about 1-10 GJ of reserve power.