  An important limitation of this model is that it does not simulate changes over time in the demand for electricity, prices, technology, or other factors considered within IPM.
The model is useless for not simulating change. 
mnli hypothesis: The model is useless for not simulating change.  premise:   An important limitation of this model is that it does not simulate changes over time in the demand for electricity, prices, technology, or other factors considered within IPM.