Hi @Mitosz01. I have not been able to reproduce the issue with Octeract; for me it seems to run fine. The way I run your project is as follows:

1. Load case 'yeeExample1'.
2. Run procedure MainInitialization.
3. Run procedure MainExecution.

Is this also how you run the project?

Maybe some useful information will be displayed in the Octeract log. It will be written in the log folder after setting the Octeract option 'Output file’ to 'Extended’.

Thank you for your answer!
I run the program the same way as you. 

Did you manage to get a solution? 
I  have it run for a whole hour and I couldn’t surpass iteration 12 or gap ~75%
Here is the link for the log 

I did not get an optimal solution but I terminated the solve after 5 minutes. This problem seems to be very difficult for Octeract. Note: to improve the performance you might want to set the Octeract option 'Thread limit’ to 10 or 12 because your computer has 12 threads available.

And did you manage to get any kind of solution for the totalcost? 
I get always “na” for it. I have run it like half an hour after I terminated. 
Do you have any advice maybe, how should I improve my model to be managable?
Should I try gorubi solver?  
Thank you in advance! 
 

If I use a time limit of 60 seconds then I get a value of 114233 for TotalCost. The best objective value that I have seen is around 104000 but still with a large gap.

Unfortunately, I have no advice for improving the performance. I think that the problem is hard because of terms like qcu(i) / (U(i,j) * LMTDcu(i,j)) in which LMTDcu itself also has a nonlinear definition.

Currently there is no Gurobi version available that can solve nonlinear problems like yours.

Thanks for your help! It really did help :)