A static synchronous compensator ( STATCOM ), also known as a static synchronous condenser ( STATCON ), is a regulating device used on alternating current electricity transmission networks. It is based on a power electronics voltage-source converter and can act as either a source or sink of reactive AC power to an electricity network. If connected to a source of power it can also provide active AC power . It is a member of the FACTS family of devices. It is inherently modular and electable.