On my factorissimo buildings there are caps to maximum power output it might be me but if you could fix that that would be nice thank you.
EX red building 10MW output blue 20MW output and I haven't tested the yellow one yet.
Press [Shift+R] while hovering over the yellow arrow by the entrance inside each factory to increase the power cap to up to 100000MW. Press [Ctrl+R] to decrease the power cap again.