In Sub-Saharan Africa, just one person in five has access to electricity. If current trends continue, fewer than 40 percent of Sub-Saharan African countries will reach universal access to electricity by 2050. Per capita consumption of electricity in Sub-Saharan Africa (excluding South Africa) averages only 124 kilowatt-hours a year and is falling. The rate of consumption is barely 1 percent of that in high-income countries. If entirely allocated to household lighting, it would hardly be enough to power one light bulb per person for three hours a day. With well over half of Sub-Saharan countries now experiencing power shortages and regular interruptions in service, leading many of these to rely on very costly leased generating plants as an emergency stopgap. Frequent power outages mean big losses in sales and damaged equipment—6 percent of turnover on average for formal enterprises, and as much as 16 percent of turnover for informal enterprises unable to provide their own backstop generation. The economic cost of power shortages can amount to more than 2 percent of gross domestic product. For some countries, it has shaved as much as one-quarter of a percentage point off annual per capita GDP growth rates. With the rising middle class and increased industrial activity, power will be the number one problem for sustained development across the continent.