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One scope of work for energy management of electrified vehicles is the powertrain dimensioning in early development phases. In current development processes only dynamic short term or stationary long term maneuvers for powertrain dimensioning are considered. Therefore, requirements can be already defined for peak and continuous operation for electric motors and the traction battery, but not for the transition in-between. Based on analysis of benchmark vehicles and the driving of more realistic load cases, it is noticeable that also dynamic long term maneuvers become interesting for the end customer. The derating behavior of the electric powertrain components must be considered, especially for such maneuvers. This means in detail the transition between peak and continuous operation. Therefore, this aspect requires a simulation model considering dynamic derating effects for early development phases.