The Journal of Electronic Science and Technology (JEST) is soliciting original manuscripts for its Special Section on Energy-Efficient Technologies (EET) — Crowd Energy Applications (CEA), which appears on JEST periodically. This Special Section on EET intends to bring together state-of-art research results and industrial applications of energy-efficient technologies. Professor Teufel presides over this issue's Special Section, while the Guest Editor and the JEST team focus on Crowd Energy Applications.