{"edition":"eGRID2023 Rev2 (2025-06-12)","coverage":{"percent":"~99.5%","total_zctas":33791,"mapped_zctas":33616,"multi_subregion_zips":0,"caveat":"ZCTAs are Census approximations of USPS ZIP service areas. Some PO boxes and unique ZIPs may not map to eGRID subregions. Note: EPA publishes a \"Multiple Subregions\" layer, but no multi-subregion ZIPs were found in current mapping."},"last_parity_check":{"timestamp":"2025-09-21T15:43:34.552Z","status":"PASS"},"lastParityCheck":{"timestamp":"2025-09-21T15:43:34.552Z","status":"PASS"},"editionPolicy":{"currentEdition":"eGRID2023 Rev2 (2025-06-12)","nextPlanned":null,"updateFrequency":null,"backwardsCompatibility":"API maintains consistent response format across editions"}}