There really isn't any efficient way to move all, or even a significant percentage of the power generated by a ReactorCraft fusion reactor. Reika mentioned
here that someone managed to produce 58
gigawatts of power - that's 58,000,000,000 W, or 5.8*10^10 W - with a fusion reactor. To convert that to RF to move with a tesseract would require more than 1,000 rotational dynamos*. To convert
that back to RoC power would require ~14,000 magnetostatic engines.
*note that while rotational dynamos can produce just shy of 12,000 RF/t each, redstone conduits can only accept 10,000 per face. It's possible to dump that energy directly into a tesseract, which doesn't have a limit, but then, even with the most efficient, incredibly complex setup to get the shaft power to the dynamos, you'd need 1 input tesseract and 1.2 output tesseracts per 6 magnetostatics, or about 367 tesseracts in total.
In short, there is no good way to transmit that much power cross-dimension. Realistically, however, it's unlikely you'll actually be able to use even 0.5% of the total power produced, especially if you only build one to power non RoC machines. It's an excellent end-game goal for low-maintenance, practically infinite power, but don't expect to be anywhere near able to use it all.
.