Actually, with 9 speed upgrades, Mek machines use 100x more power. Eek. With 9 energy upgrades, they use 1/10 of power (using machines at 2 RF/t or the Digital Miner at around 8 RF/t is slow, but fun).
So, with 9 of both, your stuff still use 10 times more energy. 200 RF/t is considerably more...