California ISO

aid: caiso
url: https://raw.githubusercontent.com/api-evangelist/caiso/refs/heads/main/apis.yml
name: California ISO
kind: company
description: '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.'
image: https://www.caiso.com/apple-touch-icon.png
tags:
- Energy
- United States
- Electricity
- Energy Markets
- Grid
- Renewables
- System Operator
- Market Data
- California
created: '2026-07-27'
modified: '2026-07-27'
specificationVersion: '0.23'
apis:
- aid: caiso:caiso-oasis-download-api
  name: CAISO OASIS Download API
  description: 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. Most
    reports retain roughly the previous 39 months of data and individual reports cap the date range they will return.
  humanURL: https://www.caiso.com/systems-applications/developer-portal
  baseURL: https://oasis.caiso.com/oasisapi
  tags:
  - Energy Markets
  - Electricity
  - Market Data
  - Pricing
  - Forecasting
  - Grid
  properties:
  - type: Documentation
    url: https://www.caiso.com/documents/oasis-frequently-asked-questions.pdf
  - type: Documentation
    url: https://www.caiso.com/documents/oasisapispecification.pdf
  - type: Documentation
    url: https://www.caiso.com/systems-applications/developer-portal
  - type: SignUp
    url: https://developer.caiso.com/_login/developersignup.aspx
  - type: Portal
    url: https://oasis.caiso.com/mrioasis/logon.do
  - type: APIReference
    url: https://www.caiso.com/documents/oasisapispecification.pdf
  - type: TermsOfService
    url: https://www.caiso.com/privacy-terms-of-use#api-terms-of-use
  - type: Authentication
    url: authentication/caiso-authentication.yml
  - type: Conventions
    url: conventions/caiso-conventions.yml
  - type: ErrorCatalog
    url: errors/caiso-error-codes.yml
  - type: RateLimits
    url: rate-limits/caiso-rate-limits.yml
  - type: Vocabulary
    url: vocabulary/caiso-oasis-query-names.yml
  - type: Examples
    url: examples/caiso-oasis-examples.yml
  - type: Lifecycle
    url: lifecycle/caiso-lifecycle.yml
  - type: ChangeLog
    url: changelog/caiso-changelog.yml
- aid: caiso:caiso-todays-outlook-data-feeds
  name: CAISO Today's Outlook Data Feeds
  description: 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 (generation by fuel including solar, wind, batteries and imports),
    demand, netdemand, and co2 (emissions by resource type). CAISO notes these are telemetry-based summaries and will not
    tie out to the market-based numbers in OASIS.
  humanURL: https://www.caiso.com/todays-outlook
  baseURL: https://www.caiso.com/outlook
  tags:
  - Grid
  - Renewables
  - Carbon
  - Electricity
  - Market Data
  properties:
  - type: Documentation
    url: https://www.caiso.com/todays-outlook
  - type: Documentation
    url: https://www.caiso.com/todays-outlook/supply
  - type: Documentation
    url: https://www.caiso.com/todays-outlook/emissions
  - type: TermsOfService
    url: https://www.caiso.com/privacy-terms-of-use#api-terms-of-use
  - type: Authentication
    url: authentication/caiso-authentication.yml
  - type: Vocabulary
    url: vocabulary/caiso-oasis-query-names.yml
  - type: Examples
    url: examples/caiso-oasis-examples.yml
common:
- type: DomainSecurity
  url: security/caiso-domain-security.yml
- type: Website
  url: https://www.caiso.com/
- type: DeveloperPortal
  url: https://developer.caiso.com/
- type: Documentation
  url: https://www.caiso.com/systems-applications/developer-portal
- type: SignUp
  url: https://developer.caiso.com/_login/developersignup.aspx
- type: Authentication
  url: https://www.caiso.com/systems-applications/requesting-access-certificates
- type: Portal
  url: https://www.caiso.com/systems-applications/portals-applications
- type: Support
  url: https://caiso.my.site.com/custsvccomm/s/knowledge-articles
- type: Documentation
  url: https://www.caiso.com/library/business-practice-manuals
- type: Blog
  url: https://www.caiso.com/about/news
- type: Blog
  url: https://www.caiso.com/about/news/energy-matters-blog
- type: GettingStarted
  url: https://www.caiso.com/getting-started
- type: APIReference
  url: https://www.caiso.com/documents/oasisapispecification.pdf
- type: TermsOfService
  url: https://www.caiso.com/privacy-terms-of-use#api-terms-of-use
- type: PrivacyPolicy
  url: https://www.caiso.com/privacy-terms-of-use
- type: Roadmap
  url: https://www.caiso.com/systems-applications/release-planning
- type: Authentication
  url: authentication/caiso-authentication.yml
- type: Conventions
  url: conventions/caiso-conventions.yml
- type: ErrorCatalog
  url: errors/caiso-error-codes.yml
- type: RateLimits
  url: rate-limits/caiso-rate-limits.yml
- type: Lifecycle
  url: lifecycle/caiso-lifecycle.yml
- type: ChangeLog
  url: changelog/caiso-changelog.yml
- type: Vocabulary
  url: vocabulary/caiso-oasis-query-names.yml
- type: Conformance
  url: conformance/caiso-conformance.yml
- type: Examples
  url: examples/caiso-oasis-examples.yml
- type: Packages
  url: packages/caiso-packages.yml
- type: LLMsTxt
  url: llms/caiso-llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com