How to deal with multiple optimal solutions?

[cswh]

There may be multiple optimal solutions at the current formulation and implementation. This should be considered when analyzing e.g. usage of grid or storage.

E.g.:

• Two storages with similar parameters in two different regions may be interchangeable in terms of operation. How should be decided which storage to use, e.g. in Switzerland or Germany?
• Which production plants are curtailed in times of excess energy (and therefore what region exports in these circumstances)?

[simnh]

Regarding storages we will look into this next week, maybe we will also have time for excess and transmission etc.

[simnh]

Implement polyhdron stuff at least for LP's would be great as a start...