def list_load_areas(self, session, mv_districts):
        """list load_areas (load areas) peak load from database for a single MV grid_district

        Parameters
        ----------
        session : sqlalchemy.orm.session.Session
            Database session
        mv_districts: 
            List of MV districts
        """

        # threshold: load area peak load, if peak load < threshold => disregard
        # load area
        lv_loads_threshold = cfg_ding0.get('mv_routing', 'load_area_threshold')
        #lv_loads_threshold = 0

        gw2kw = 10 ** 6  # load in database is in GW -> scale to kW

        #filter list for only desired MV districts
        stations_list = [d.mv_grid._station.id_db for d in mv_districts]

        # build SQL query
        lv_load_areas_sqla = session.query(
            self.orm['orm_lv_load_areas'].id.label('id_db'),
            (self.orm['orm_lv_load_areas'].sector_peakload_residential * gw2kw).\
                label('peak_load_residential'),
            (self.orm['orm_lv_load_areas'].sector_peakload_retail * gw2kw).\
                label('peak_load_retail'),
            (self.orm['orm_lv_load_areas'].sector_peakload_industrial * gw2kw).\
                label('peak_load_industrial'),
            (self.orm['orm_lv_load_areas'].sector_peakload_agricultural * gw2kw).\
                label('peak_load_agricultural'),
            #self.orm['orm_lv_load_areas'].subst_id
            ). \
            filter(self.orm['orm_lv_load_areas'].subst_id.in_(stations_list)).\
            filter(((self.orm['orm_lv_load_areas'].sector_peakload_residential  # only pick load areas with peak load > lv_loads_threshold
                     + self.orm['orm_lv_load_areas'].sector_peakload_retail
                     + self.orm['orm_lv_load_areas'].sector_peakload_industrial
                     + self.orm['orm_lv_load_areas'].sector_peakload_agricultural)
                       * gw2kw) > lv_loads_threshold). \
            filter(self.orm['version_condition_la'])

        # read data from db
        lv_load_areas = pd.read_sql_query(lv_load_areas_sqla.statement,
                                          session.bind,
                                          index_col='id_db')

        return lv_load_areas