IESO
The Independent Electricity System Operator (IESO) is the Crown corporation that operates Ontario's bulk electricity system and administers the province's wholesale electricity market, balancing supply and demand in real time, running the day-ahead and real-time energy and operating reserve markets, procuring capacity and transmission rights, planning the provincial grid, and delivering the Save on Energy conservation programs. It sits at the top of Canada's largest provincial electricity value chain — upstream of the licensed local distribution companies that bill retail customers — which is why its API posture splits cleanly in two. Its market and system data surface is genuinely open: a public report repository at reports-public.ieso.ca serves 139 report directories of demand, price, generation-by-fuel, intertie flow, outage, adequacy and settlement data as CSV, XML and XLSX over anonymous HTTPS with no account, key or registration, backed by published XSD schemas and a public interface specification. Its programmatic APIs are the opposite: the Axway SecureTransport REST API at reports.ieso.ca/api/v1.4, the SOAP Market Information Management web services, and the Appian-based Online IESO registration, retrofit, dispatch and outage web services are all reserved for registered Ontario market participants with IESO-issued machine accounts. IESO publishes no consumer energy-data API: Ontario's Green Button mandate (O. Reg. 633/21) binds licensed electricity and gas distributors, not the system operator, so there is no retail usage or billing surface here at all.
IESO 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.
IESO 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.
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