[belorn]

They do the same double accounting for green credits. If a country produce green energy it get accounted there. If they then sell that energy it get accounted a second time by the country who buys it. The exporter (possible a separate company from the producer) can even account it a second time, as can the consumer in the end.

Basically every time green energy has changed hand there are two new credits being created, and with a international energy market there is a lot of opportunities for energy to change ownership.