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Full detail: Where this data comes from
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.
APIs.json: https://raw.githubusercontent.com/api-evangelist/caiso/refs/heads/main/apis.yml
- Energy
- United States
- Electricity
- Energy Markets
- Grid
- Renewables
- System Operator
- Market Data
- California
- Created: 2026-07-27
- Modified: 2026-07-27
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 groupid plus a UTC datetime range and return a ZIP containing CIM-format XML (resultformat=5) or CSV (resultformat=6). Report families cover locational marginal prices (PRC_LMP, PRC_INTVL_LMP, PRC_CURR_LMP), system load and renewables forecasts (SLD_FCST, SLD_REN_FCST), ancillary services, congestion revenue rights, and the ATLAS reference data set (ATL_PNODE and friends). Requests are anonymous — no API key, token, or account.
- Human URL: https://www.caiso.com/systems-applications/developer-portal
- Base URL:
https://oasis.caiso.com/oasisapi
- Energy Markets
- Electricity
- Market Data
- Pricing
- Forecasting
- Grid
- Documentation — OASIS Frequently Asked Questions
- Documentation — Interface Specification for OASIS
- Documentation
- Sign Up
- Portal
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 five-minute resolution, and https://www.caiso.com/outlook/history/{YYYYMMDD}/{report}.csv returns a past day. Confirmed reports are fuelsource, demand, netdemand, and co2. CAISO notes these are telemetry-based summaries and will not tie out to the market-based numbers in OASIS.
- Human URL: https://www.caiso.com/todays-outlook
- Base URL:
https://www.caiso.com/outlook
- Grid
- Renewables
- Carbon
- Electricity
- Market Data
- Mandate regime:
other— US federal open-access wholesale transparency (FERC Order Nos. 888/889 OASIS requirement), not a consumer data right. - Mandate status:
live-implemented— verified by anonymouscurlagainsthttps://oasis.caiso.com/oasisapi/SingleZipon 2026-07-27, which returned HTTP 200 and a ZIP containing real day-ahead LMP CSV rows. Five further query names were confirmed the same way. - Data standard: IEC CIM-derived XML for OASIS payloads (per the OASIS interface specification), with a CSV alternative; query and report vocabulary is proprietary to CAISO. No Green Button / ESPI reference found anywhere.
- Consumer data API: none, and none possible — CAISO has no retail customers.
- Market data open: yes — OASIS plus the Today's Outlook CSV feeds, both fully anonymous.
- Access gate:
self-servefor the API surface (literally no credential of any kind). The documentation isapplication-approval: CAISO's OASIS FAQ states developer-site signup requires a recognized corporate email domain and a detailed justification, and consumer email domains "would be subject to rejection." Every other CAISO system ispartner-onlybehind a company User Access Administrator plus PKI client certificates. - Auth model: none for OASIS and Today's Outlook; forms-based SharePoint login for the developer documentation site; X.509 client certificates chained to the CAISO issuing authority plus UAA-sponsored accounts for participant systems. No OpenID Connect discovery document is served.
- Machine-readable contracts: none published. No OpenAPI, AsyncAPI, Postman collection, or GraphQL schema was found, so no
openapi/directory exists in this repo.
See review.yml for the full probe log with HTTP status for every URL tested.