def METHOD_NAME(ds: Datastore) -> dict[str, pd.DataFrame]:
    """Extract metadata and timeseries from raw EIA bulk electricity data.
    Args:
        ds: Datastore object
    Returns:
        Dictionary of dataframes with keys 'metadata' and 'timeseries'
    """
    raw_zipfile = ds.get_unique_resource("eia_bulk_elec")
    dfs = _extract(BytesIO(raw_zipfile))
    return dfs