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.

Kin Score

This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.

How we profile California ISO

Each block below is one kind of artifact we hold for California ISO. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.

APIs 2

Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.

Individual APIs this provider publishes, each with its own machine-readable definition.

CAISO OASIS Download API

The Open Access Same-time Information System (OASIS) Download API — CAISO's public wholesale market data interface. Two servlets, SingleZip and GroupZip, accept a queryname or g...

CAISO Today's Outlook Data Feeds

The CSV feeds behind CAISO's public Today's Outlook dashboard. Anonymous GET requests to https://www.caiso.com/outlook/current/{report}.csv return the current operating day at f...

Rate Limits 1

Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.

Documented rate limits and quota policies.

Caiso Rate Limits

3 limits

RATE LIMITS

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Caiso Authentication

none/mutualTLS · 2 schemes

SECURITY

Caiso Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Every other property we hold for California ISO — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.

← All providers · Data indexed from github.com/api-evangelist/caiso · machine-readable index on apis.io