When electricity from high-voltage transmission lines comes into a substation, transformers step down the voltage for distribution to homes and businesses. This happens at substations.
Substations are equipped with fuses that split the current into multiple distribution lines. Through circuit breakers, switches, and capacitors, grid operators can also isolate and control the interface between high-voltage power lines and distribution lines. When the electricity supply leaves the substation via the distribution lines, it's ready for delivery to homes and businesses.