Semi-OT: A General Tech Question Thread for me :)

[Starhawk]

Howdy all it's me Starhawk with a question for all you techno nerds and nerdets I have a question for ya'll on Ship's Powerplants in Sci-Fi and WTF it all means.

Now the reason I ask this is because while writing up a tech sheat for my Icaran SuperDreadnought (just for kicks) I had it like this

main power plant generates 100 Terawatts

each turret micro reactor provides 2 Terawatts of firepower per cannon per shot (meaning a total of 6 Terawatts from each main turret per broadside)

Now in ST we hear Riker claim that the Enterprise D does not generate even ONE Terawatt of power and he is astonished to come across a Terawatt powersource.

Now here's where it get's tricky:
In Babylon Five's Tech guide a Narn G'Quan heavy cruiser (not the most advanced ship in B5) Generates 37,500 TERAWATTS!

Now given that Bab5 is considerably less advanced than anything in ST (Aside from First Ones and Minbari) how is this power measurement come across?

Also being that Icarans are much more advanced then any ST race (cept maybe the Pre Voy Borg) I figured a 100 Terawatt powersource for a ship 3 kilometers long that bristles with weapons and has null space shielding would be reasonable but am no longer sure of this.

Any of you guys able to answer what is a reasonable power generation ratio for a ship with energy weapons, shields and powerful drives? Especially considering I read somewhere that the Entire PLANET EARTH only generates a few hundred Terawatts at any given time.