How power factor correction equipment reduces electricity costs and emissions

The link below is to an article discussing the relationship between the power factor real power (KW), reactive power (KVAR) and the apparent power (KVA)of an electrical system and how this reduces electricity costs and improves system capacity.
https://drive.google.com/open?id=1KyvicVnZEkcBs1EiojfiR2UbzodECbeJ