ELI5: Explain Like I'm 5

Flexible AC transmission system

A Flexible AC Transmission System (FACTS) is a way of connecting the power lines that bring electricity from the power plant to your home, so that electricity can travel better, faster, and farther. It helps the electricity to flow more smoothly, which makes it easier to get the power where you need it. It makes sure the electricity is delivered in a way that won’t damage the power lines or damage the other electrical devices it is connected to.