@LiamR 

Hi,
Thank you very much for your report!
Currently, the Kasa app does not have the feature to export energy consumption data, but we have confirmed with the dev team that there is a plan to add this feature to the Kasa devices with an energy monitor feature, but currently no estimated time for when the feature will be available. Please pay attention to the firmware release notes on the Kasa app or official website for the Kasa devices, and the related information will be added to the notes if this feature is available.

One more important note, we understand that you want to provide a guide and help others who have the same inquiry, however, we do also consider this may have a network issue or installation problems, and TP-Link will not be able to help those users who use this Python script. So we suggest waiting for the new feature to release.

Best Regards