def METHOD_NAME(self):
    """
    Retrieves current PSU voltage output
    Returns:
        A float number, the output voltage in volts,
        e.g. 12.1
    """
    psu_voltage = self._get_pmc_register(self.psu_voltage_reg)
    if (psu_voltage != 'ERR') and self.get_presence():
        # Converting the value returned by driver which is in
        # millivolts to volts
        psu_voltage = float(psu_voltage) / 1000
    else:
        psu_voltage = 0.0
    return psu_voltage