further email from GnErgy:
Thank you for your email.
We can support Economy 10 meters but we try not to register these supplies. We have in the past taken Economy 10 meters and they have been billed as an Economy 7 meter.
Due to the timings and rates, we are currently not looking to take economy 10 meters, especially with complex 2 MPAN/ 3 rate economy 10 meters.
Customer Service Team