ENMAX
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.
ENMAX is tracked in the API Evangelist network. This page is the human-readable profile that sits on top of the machine-readable index we maintain at apis.io.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
ENMAX is in the network as a tracked entity. We haven't yet indexed a public API surface for it — when one is published, the artifacts, score, and agent-readiness read will appear here automatically. The source repository is where that profile is built.
← All providers · Data indexed from github.com/api-evangelist/enmax · machine-readable index on apis.io