A PS Audio server communicates with a registered PowerPlant and makes the information available via a webpage, https://www.psaudio.com/my-ps/powerplay/.
You have to register your PowerPlant with PS Audio (product registration page) for PowerPlay to work.
As the PowerPlay page explains: “With this new interface you will be able to view your current wattage, voltage and THD readings as well as see 30 days worth of historical data. There will also be an option to download the data for your own record keeping should you wish to do so.”