Using air conditioners and electric fans to stay cool accounts for nearly 20% of the total electricity used in buildings around the world today. Rising demand for space cooling is also putting enormous strain on electricity systems in many countries, as well as driving up emissions. Absent firm...

Electric power in OECD countries is mostly produced by large central generating stations, then transmitted along high voltage lines to local distribution systems that carry it to final consumers. Distributed generation plants are different. They produce power on an electricity consumer’s own...