oUF.Tags['tanoh:altpower'] = function(u)
    if( UnitPowerMax(u, ALTERNATE_POWER_INDEX) > 0 ) then
        return string.format("%d/%d",UnitPower(u, ALTERNATE_POWER_INDEX), UnitPowerMax(u, ALTERNATE_POWER_INDEX));
    else
        return "";
    end
end
oUF.TagEvents['tanoh:altpower'] = "UNIT_POWER";