The transmitter in the Vulcan sanctuary uses a krellide storage cell.represents an average rate of change in gravitational potential of roughly a gigawatt per kilogram of ship. Estimating the ship to be in the general neighborhood of 200,000-1,000,000 metric tons, considering the energy expenditures averaging a tenth the total normal warp power expenditures involved in leaving a trinary system of blue giants, and assuming that the Enterprise operated at no less than full power, we may conclude that the Enterprise's warp core redlines at approximately ~1 exawatt.
"Singularity" - a 17 minute trip out-system involves a 2 million kilometer pass of a black hole. A naturally occurring "stellar" black hole typically has a mass between 4 and 15 times that of the sun. A path beginning 2 million kilometers from a black hole and ending a far distance away (e.g., a half light year)
At least one prototype for the Xindi planet-destroyer was run off of a fusion reactor.