aid: enmax url: https://raw.githubusercontent.com/api-evangelist/enmax/refs/heads/main/apis.yml name: ENMAX kind: company description: >- ENMAX Corporation is the Calgary-based energy company owned outright by The City of Calgary, describing itself on its own about page as "a regulated wires company, a competitive power generator and an energy retailer" operating "across Alberta and Maine." It spans three tiers of the value chain at once: ENMAX Power owns and operates the regulated electricity distribution and transmission system inside Calgary, ENMAX Energy generates power and sells electricity and natural gas into Alberta's deregulated retail market under the Easymax brand, and Versant Power — acquired from Emera in 2020 — is the transmission and distribution utility for northern and eastern Maine. Its API posture is the exact inverse of the Ontario utilities it is usually compared to, and the inversion is the finding. No consumer energy data mandate binds ENMAX anywhere it operates: Alberta has no Green Button regulation, Ontario's O. Reg. 633/21 does not reach across the provincial border, Canada has no national equivalent, and Maine imposes no Green Button obligation on Versant Power. Unmandated, ENMAX built nothing — its own support documentation states plainly that the Energy Insights usage view inside a customer's Easymax account "is view-only within your online account and can't be exported at this time," which is a harder closure than most: not merely no API, but no CSV, no XML, and no Green Button either. There is no developer portal, no developer, api, docs or data subdomain, no OpenAPI, and no published third-party data path. What ENMAX does publish openly is grid data. Its Hosting Capacity, Load Capacity and Service Area maps, linked from enmax.com/system-resources, are ArcGIS Online web applications backed by ArcGIS REST feature services that answer anonymous machine-readable queries with no key, no signup and no terms — distribution-feeder DER hosting headroom and remaining load capacity for the Calgary service territory, the data a solar or storage developer actually needs. ENMAX never calls this an API and documents none of it, but it is real, it is open, and it is queryable. Wide open on grid data, completely shut on customer data. accessModel: pricing: free onboarding: none-published trial: false try_now: false public: true label: Free · No published developer program; open ArcGIS grid services are anonymous confidence: high source: - documentation - probing generated: '2026-07-27' method: manual image: https://www.enmax.com/favicon.ico tags: - Energy - Canada - Utilities - Electricity - Natural Gas - Grid - Smart Metering - Solar - DER - Geospatial - Alberta - Electricity Distribution created: '2026-07-27' modified: '2026-07-27' specificationVersion: '0.19' apis: - aid: enmax:enmax-power-system-capacity-arcgis-feature-services name: ENMAX Power System Capacity ArcGIS Feature Services description: >- 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. humanURL: https://www.enmax.com/system-resources baseURL: https://services1.arcgis.com/NKgP4VcXUzEyOnmg/arcgis/rest/services tags: - Grid - Hosting Capacity - Load Capacity - DER - Solar - Geospatial - Open Data - Electricity Distribution properties: - type: Documentation url: https://www.enmax.com/system-resources - type: Documentation url: https://www.enmax.com/system-resources/hosting-capacity-map - type: Documentation url: https://www.enmax.com/system-resources/load-capacity-map - type: Documentation url: https://www.enmax.com/system-resources/service-area-map - type: Website url: https://services1.arcgis.com/NKgP4VcXUzEyOnmg/arcgis/rest/services?f=json common: - type: DomainSecurity url: security/enmax-domain-security.yml - type: Authentication url: authentication/enmax-authentication.yml - type: Conventions url: conventions/enmax-conventions.yml - type: ErrorCatalog url: errors/enmax-problem-types.yml - type: RateLimits url: rate-limits/enmax-rate-limits.yml - type: DataModel url: data-model/enmax-data-model.yml - type: Lifecycle url: lifecycle/enmax-lifecycle.yml - type: Conformance url: conformance/enmax-conformance.yml - type: Examples url: examples/_index.yml - type: LLMsTxt url: llms/enmax-llms.txt - type: Website url: https://www.enmax.com/ - type: Documentation url: https://www.enmax.com/system-resources - type: About url: https://www.enmax.com/about-us - type: Blog url: https://www.enmax.com/news - type: LinkedIn url: https://www.linkedin.com/company/enmax - type: SignUp url: https://myaccount.enmax.com/register - type: Login url: https://myaccount.enmax.com/ - type: Support url: https://www.enmax.com/customer-support - type: Contact url: https://www.enmax.com/contact-us - type: TermsOfService url: https://www.enmax.com/terms-of-use - type: PrivacyPolicy url: https://www.enmax.com/privacy - type: Status url: https://outages.enmax.com/ maintainers: - FN: Kin Lane email: kin@apievangelist.com