ENMAX Power System Capacity ArcGIS Feature Services
The machine-readable grid data behind ENMAX Power's public Hosting Capacity, Load Capacity and Service Area maps. The three maps published at enmax.com/system-resources are ArcGIS Online Web AppBuilder applications hosted in the GeoARM ArcGIS Online organization, and their operational layers resolve to ArcGIS REST feature services on services1.arcgis.com that answer anonymous queries. Generation_Capacity_Layers_20250219_PUBLIC carries estimated remaining DER hosting capacity by distribution feeder segment (fields OBJECTID, FEEDERID, Description, Phase_Designation, Range, Date_Last_Updated), Feeder_Load_Capacity_Rev9_20251211 carries estimated remaining load capacity as of December 2025, and ENMAX_Service_Area_for_LAF_Verification carries the distribution service boundary. Verified anonymously on 2026-07-27: the service directory, each FeatureServer metadata document, and a live /query returning attribute rows all responded HTTP 200 with application/json and no credential of any kind. This is genuinely open grid data — but it is open by consequence of Esri hosting rather than by design. ENMAX publishes no developer portal, no API reference, no OpenAPI, no rate limits, no terms of use and no versioning policy for these endpoints, and never describes them as an API anywhere on enmax.com. The service names are date-stamped and have already rolled from Rev8 to Rev9, so the paths are not stable contracts. Treat as an undocumented but real public data surface.