A microcomputer has been used to measure powerline frequency with a precision of six decimal digits (0.0001 Hz) using an averaging time of 3 to 4 min. The algorithm for frequency measurement requires no multiplication or division operations, so a very simple microprocessor can be used. The frequency measurement is sensitive enough to permit detection of small, controlled changes in generation, hence in powerline frequency. Thus, the results of the frequency measurement can be applied to the load-management field. Methods based on these principles have the potential of providing an inexpensive communications path between the power supplier and the industrial user for purposes of shedding load during peak power usage.