Whats happening is that once you reach 1 mil, any blocks added after supply only 25 energy/sec, no matter the configuration. This means that 1 mil is basically the cap, espescially if youre trying to reach regen in the millions-billions. It makes making large reactors very difficult.
Somehow that\'s not quite right. Starting with 1.1 million total (wrote wrong number earlier), if I cut a 400-block power spar in half I lost 624 power. I added lots of power spar somewhere else and cut the big spar again, and I only lost 212 power. Hmm.
Adding a block to the side of a random lesser 200-block power spar got me 25.7 power instead of exactly 25. Clearly it is wrong to say that there is no bonus power after 1 million, but the diminishing returns are also killer.