def METHOD_NAME(
    hourly_emissions_epacems: dd.DataFrame,
) -> pd.DataFrame:
    """Make unique annual plant_id_eia and emissions_unit_id_epa.
    Returns:
        dataframe with unique set of: "plant_id_eia", "year" and "emissions_unit_id_epa"
    """
    epacems_ids = (
        hourly_emissions_epacems[["plant_id_eia", "year", "emissions_unit_id_epa"]]
        .drop_duplicates()
        .compute()
    )
    return epacems_ids