As prices of photo-voltaic cells plummet, solar power is becoming competitive in comparison with more traditional kinds of generation. Solar plants rated hundreds of MW are now a reality, and with grid codes demanding a certain percentage of reactive power contribution, compensating devices will be called for. This is where FACTS is coming into the picture.
When solar penetration increases to the point where it becomes a significant fraction of the load, added regulation is required for good grid stability control to compensate the fluctuations in generated solar power.
Among FACTS devices, SVC, STATCOMS and Series Capacitors come naturally into the picture for these purpose.