Abstract: The present invention is a digital and analog system for generating an energy log for instant recall and display. The system is permanently programmed in read-only memory with the task of scanning sensor inputs, performing consumption calculations, updating the non-volatile memory, responding to external commands, and monitoring peripheral performance. The stored information is available for real-time query of individual sensor data or as a composite hard copy report on a month-to-date or month-end basis. The apparatus accepts inputs from both analog and digital sensors whose outputs produce information related to data such as current consumption, water consumption, or fuel consumption and provides an optional interface for the control of these functions based on pre-programmed upper/lower limits.