Use a cheaper energy source until you can make a 256x256 quarry, I suggest to make a mystcraft age that's just one huge lava ocean and place an ender pump with an ender tank/tesseract and transport the lava to magmatic engines. I was making 10,240 RF/t with 2 stacks of magmatic engines. It doesn't last forever though so after a couple of weeks you'll have to move the ender pump around.