def con_joule_to_kwh(energy_joule):
    """
    Converts energy value from Joule to kWh

    Parameters
    ----------
    energy_joule : float
        Energy demand value in Joule

    Returns
    -------
    energy_kwh : float
        Energy demand value in kWh
    """
    energy_kwh = energy_joule / (1000 * 3600)
    return energy_kwh