This recommended practice specifies the Power Quality Data Interchange Format (PQDIF) for the transfer of power quality data between monitoring instruments and computers. This includes raw data as well as processed, simulated, proposed, specified, and calculated data. The scope of the transfer file format includes the power quality measurements as well as appropriate characterization parameters, such as sampling rate, resolution, calibration status, instrument identification, location, and other related metadata or characteristics. The recommended practice also provides best practices for representing data and guidelines for transferring power quality data. This standard incorporates open-source material hosted on the IEEE SA Open Source Platform.