def jac_shortage(x, cf, *args):
    """Function defining Jacobian of inequality constraint on
    RES production shortage, when production from RES is not able
    to meet fraction of demand not met by conventional components.

    :param x: State vector(not used).
    :param cf: Time-dependent capacity factors.
    :type x: :py:class:`numpy.array`
    :type cf: :py:class:`numpy.array`

    :returns: Value of Jacobian of constraint.
    :rtype: :py:class:`numpy.array`
    """
    return cf
