The first thing most people do when they walk into a room is to turn the lights on. But most people do not think of how that power got there and where it came from. In reality, electricity is a complex system responsible for the generation, transmission and distribution of electrons. So how do we know if the electricity we’re using came from renewable energy or not? The answer: Renewable Energy Certificates (RECs). But in order to understand how RECs work and how they do their part to clean our grid, we must first understand how the grid brings electricity to our homes and businesses, and how it operates as a whole.