Imagine life without electricity. With no lights, electric stove, or water pump, you must travel miles to fetch water and firewood, running a particular risk of attack if you are a girl or a woman. At home, you cook over a smoky stove or an open fire, raising your odds of getting lung and heart disease. If you are pregnant, you may die in the dark, giving birth at a clinic that lacks air conditioning and modern medical equipment. Without vaccines, which require refrigeration, your children remain vulnerable to deadly diseases. At night, they study by the light of a kerosene lamp, which causes burns when the fuel spills. Earning a living isn’t easy, either. No electricity means no sewing machines or rice mills, no pumps for irrigating crops, and no way to keep drinks cold or keep a store...