def METHOD_NAME(self, axes=None, **kwargs):
    n = len(self.buildings)
    if axes is None:
        fig, axes = plt.subplots(n, 1, sharex=True)
    assert n == len(axes)
    for ax, elec in zip(axes, self.elecs()):
        ax = elec.mains().plot_power_histogram(ax=ax, **kwargs)
        ax.set_title('House {}'.format(elec.building()))
    return axes