def max_shift_down_rule(mod, p, tmp):
    """
    **Constraint Name**: DR_Max_Shift_Down_Constraint
    **Enforced Over**: DR_OPR_TMPS

    Limits the removed load to the available power capacity.
    """
    return mod.DR_Shift_Down_MW[p, tmp] <= \
        mod.Capacity_MW[p, mod.period[tmp]] \
        * mod.Availability_Derate[p, tmp]