email received from powershop 8/3/18:
Thanks for getting in touch regarding our supply of economy 10 meters, hopefully I can help. We do indeed supply economy 10 meters, though how we do so differs slightly depending on the particular meter configuration at the property.
If a property is on an economy 10 meter with a related MPAN, we’ll apply our unrestricted rates to all meters on the property. All usage will be charged at the same rate, though there’s only one standing charge for the property, as opposed to multiple standing charges for multiple MPANs.
If a property has a single MPAN with an economy 10 meter installed, we would apply our economy 7 rates, so the customer receives the lower, off-peak rate for the full 10 hours.
If you would like any more information, please feel free to get in touch.