Thank you. I will need to work through all this material and see what I get. I am using Vscode to write a script and will hope to run the program in stand alone mode with the solver in my script. I actually have the program running in VBA, but it takes 4.5 hours to solve for every hour of the year, hence the move to Julia. At this time our team wants to define all inputs in Excel and then read the outputs from the Julia script back into Excel for graphing and further analysis. I know it sounds complicated… my initial inclination was to do it in my native language Fortran, but going forward this was seen as a retrograde step.