California ISO
The California Independent System Operator (CAISO) is the non-profit public benefit corporation that operates the high-voltage transmission grid serving roughly 80 percent of California plus a portion of Nevada, and runs the wholesale day-ahead and real-time electricity markets, the Western Energy Imbalance Market (WEIM), and the Extended Day-Ahead Market (EDAM). As a system and market operator in the United States it sits at the wholesale layer of the energy value chain — upstream of the investor-owned utilities that bill retail customers, and therefore it holds no retail customer accounts and publishes no consumer usage data. Its API posture is a clean split: market data is genuinely open and consumer data does not exist. The OASIS Download API at https://oasis.caiso.com/oasisapi serves locational marginal prices, demand and renewables forecasts, ancillary services, transmission and nodal reference data as zipped CSV or CIM XML to anonymous callers with no key, no account and no registration — CAISO states in writing that every system it operates except OASIS requires a company User Access Administrator to grant access. The Today's Outlook telemetry feeds under https://www.caiso.com/outlook publish five-minute fuel mix, demand, net demand and CO2 as plain CSV, also anonymously. Everything else — market submission, dispatch, settlements and the participant portals — is behind PKI client certificates and UAA-sponsored accounts, and even the OASIS reference documentation on the developer site requires a signup reviewed against a corporate email domain and a written justification. No Green Button, ESPI, or Consumer Data Right surface exists here and none is expected to; the obligation CAISO answers to is FERC's open-access transparency regime, not a consumer data right. No OpenAPI, AsyncAPI, or other machine-readable contract is published for any of it.
California ISO 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.
California ISO 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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