docs: def generation_fluctuating(self):
          """
          Get generation time series of fluctuating renewables (only active
          power)
  
          Returns
          -------
          :pandas:`pandas.DataFrame<dataframe>`
              See class definition for details.
  
          """
          try:
              return self._generation_fluctuating.loc[[self.timeindex], :]
          except:
              return self._generation_fluctuating.loc[self.timeindex, :]