Harmonize all cost parameters and results?

[nelliputkonen]

It's a bit confusing that in general costs are given in CUR/MW or CUR/MWh, but investments are given in CUR/kW and CUR/kWh. Similarly, the cost results are given in MCUR. This can easily lead to modelling errors and results can be difficult to interpret, especially when using something else than MW's as base unit in the model. In my opinion, it would be more straightforward if the model would not make any scaling decisions for the user, but all inputs would be CUR/energy_unit and all cost outputs would simply be CUR. What do you think?