It's hard to imagine a world without electricity. It powers elevators that allow us to build up, rather than out. Electricity keeps our homes at the right temperature. It helps to purify the water that we drink, and sometimes the air that we breathe. We use electricity for our phones and computers. And given the continuing growth of the Internet of Things, electricity demand will grow for many years to come. But as demand increases, so do the assaults to the system that delivers that energy—the power grid.