Home
Eyedro Home Energy Monitor

https://www.amazon.com/Eyedro-Metering-Electricity-Real-Time-EYEDRO-HOME/dp/B0CD2SZX35

To save your energy data:

The MyEyedro Cloud Software includes a Data Exporter feature that allows you to download your historical energy usage directly to a CSV file on your computer for external analysis in programs like Excel.

Not sure whether the above is possible with the "standard" (free) version of the software, or if we need "pro" ($39 a year). Also, pro version allows "demand thresholds", which might be exactly what we want to determine what is causing OPALCO demand charges?

Installing Eyedro Modules and Cables (YouTube)
Eyedro WiFi Setup (iPhone) (YouTube)
Support (website)