The answer, in part, lies in the interconnectedness of the power grid, Kupper says. There are many links in the power supply chain that connect to generate and deliver power to electric consumers. Together, these links work in harmony to achieve a stable electric system – a sort of balancing act that requires electric generation supplying the grid be equal to electric demand, or the electricity coming off the grid. When this balance of power supply and demand is lost, the entire system is at risk of failure.