I don't know much about how the power company changes for power but I do know
a little about PFC. Power Factor Correction is also used to reduce the
harmonic noise devices put on a power line. For example, a simple bridge
rectifier and filter cap to convert ac to dc creates a lot of harmonic
distortion. This is because the cap can't draw current until the rectified
voltage is > than the DC output voltage. Therefore the capacitor must draw
larger amounts of current over shorter periods of time. An AC outlet may be
able to run 4,100 watt power factor corrected devices but only 2,100 watt non
power factor corrected products. This is because the PFC. devices peak
current draw will be nearly equal to its average current draw. But the peak
current on the non PFC. device may be >> than its average draw.

Just some food for thought

Steve