This class examines technology from the perspective of energy sources and power flows. The course begins with a broad overview of the topic, a definition of terms, and an opportunity to discuss political and social ramifications. At the same time, students are introduced to a handful of technical concepts that draw on skills learned in physical computing (a prerequisite for the course) to gain a concrete understanding of energy. These skills allow the student to evaluate, monitor, harvest, and store small and/or intermittent sources of (typically electrical) energy, such as those from solar cells, turbines, and other sources. Students execute several small hands-on projects and one larger-scale project using the concepts learned in the class.