Feature request: option to choose SEx instead of net code

[sander-visser]

When comparing I would find it more relevant to compare to all of SE3 compared to my small local energy net.

If using monthly energy broker I would be charged based on SEx an not my tiny net (where maybe one factory causes a significant diff compared to SE3)

This also avoids issue when my net supplier fails to send data to eSett (read PTE)

An option to choose would be nice :)