Hypermatter reactors use annhilation reactions not fusion. How it works is anyones guess there are many processes which could be termed as annihilation. Anti-matter & matter annhilation is one type; while blackhole catalysed annihilation is another. A blackhole catalysed annihilation system is superior in that it would allow total mass annihilation without the potential hazzards of antimatter. While no process is 100% efficient, annhilation is nearly so, and thus far more effective than nuclear fusion.Wow and our sun only outputs 3.83e24 watts or 91,500,000,000 (9.15e10) megatons of tnt per second!
Hyperdrive power generators must use other dimensional matter for their fusion reactor generators. Because the sustaining burning the sun requries is 8.5 billion pounds of matter a second!
So a Executor would need to burn 340 times that amount. Then again the sun doesn't completely destroy matter. Most of the process is just converting hydro to helium.
Go to this link all will be explained: +http://theforce.net/swtc/power.html