@staticmethod
def _offshore_get_means(data, gen_gid):
    """Get the mean point data from the data array for gen_gid.

        Parameters
        ----------
        data : np.ndarray | None
            Array of mean data values or None if no data is available.
        gen_gid : int
            location to get mean data for

        Returns
        -------
        mean_data : float | None
            Mean data value or None if no data available.
        """
    mean_data = None
    if data is not None:
        mean_data = data[gen_gid]
    return mean_data
