aid: miso
url: https://raw.githubusercontent.com/api-evangelist/miso/refs/heads/main/apis.yml
name: MISO
kind: company
description: 'MISO — the Midcontinent Independent System Operator — is the not-for-profit Regional Transmission
  Organization that operates the electric grid and the wholesale electricity markets across fifteen US
  states and the Canadian province of Manitoba, serving a footprint of roughly forty-five million people
  from headquarters in Carmel, Indiana. Formed in 1998 and operating the region since December 2001, it
  is regulated by the Federal Energy Regulatory Commission, dispatches generation in real time, clears
  day-ahead and real-time energy and ancillary services markets, runs the ARR/FTR market and the generator
  interconnection queue, and plans the transmission system. It sits squarely in the middle of the value
  chain: it owns no generation, no wires and no retail customers, but it holds the market-wide operational
  data that every generator, transmission owner, load-serving entity and trader in the Midwest and the
  South depends on. Its API posture is the classic system operator split, and it is an unusually clean
  example of it. On the market side MISO is genuinely open — thirty-seven JSON endpoints at public-api.misoenergy.org
  return real-time fuel mix, load, prices, binding constraints and interchange to an anonymous GET with
  no key, no account and no click-through, and the full market report archive at docs.misoenergy.org downloads
  anonymously as CSV and XLSX. On the consumer side there is nothing to open: MISO is not a retail utility,
  holds no customer usage or billing data, and no energy-data mandate of any kind applies to it. Green
  Button is voluntary in the United States and is a distribution-utility standard; MISO publishes no Green
  Button, ESPI, or consumer data-sharing surface, and makes no claim to. Its newer MISO Data Exchange
  developer portal adds a keyed but self-serve tier over historical market report data, and its MUI 2.0
  market interface is a genuinely closed, client-certificate-gated API for registered market participants
  only.'
image: https://www.misoenergy.org/siteassets/favicons/miso-icon-only---blue-green---whitebg_rgb_192.png
tags:
- Energy
- United States
- Electricity
- Energy Markets
- Grid
- System Operator
- Market Operator
- Wholesale Power
- Open Energy Data
- Renewables
- Solar
- Demand Response
- Utilities
created: '2026-07-27'
modified: '2026-08-04'
specificationVersion: '0.19'
apis:
- aid: miso:miso-public-api
  name: MISO Public API
  description: Real-time market and operations data displays, served from one host under /api/ with no
    authentication. Covers both the Markets and Operations display tables MISO documents together.
  humanURL: https://www.misoenergy.org/markets-and-operations/RTDataAPIs/
  baseURL: https://public-api.misoenergy.org
  tags:
  - Open Data
  - Grid
  - Fuel Mix
  - Load
  - Interchange
  - Wind
  - Solar
  - Outages
  - Anonymous Access
  properties:
  - url: openapi/miso-public-api-openapi.json
    type: OpenAPI
  - type: Documentation
    url: https://www.misoenergy.org/markets-and-operations/RTDataAPIs/
  - type: APIReference
    url: https://public-api.misoenergy.org/
  - type: Website
    url: https://www.misoenergy.org/markets-and-operations/real-time--market-data/operations-displays/
  X-Merged-From:
    note: Was two API entries — "Operations Displays" and "Markets Displays" — derived separately from
      the same documentation table. Same baseURL, same absent auth, same docs page. Reported by a reader
      2026-08-04 and merged.
    entries:
    - MISO Public API - Operations Displays
    - MISO Public API - Markets Displays
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
- aid: miso:miso-data-exchange-pricing-api
  name: MISO Data Exchange Pricing API
  description: 'The pricing half of MISO Data Exchange, MISO''s Azure API Management developer programme
    over Market Report data. Ten documented GET operations covering day-ahead and real-time ex-ante and
    ex-post locational marginal prices by commercial pricing node, day-ahead and real-time ex-ante and
    ex-post ancillary services market clearing prices by reserve zone, a real-time MCP summary, and an
    aggregated pricing node reference list. Responses are paged and carry the four LMP components — lmp,
    mcc (marginal congestion), mec (marginal energy) and mlc (marginal losses). A subscription key is
    required: an anonymous GET to https://apim.misoenergy.org/pricing/v1/day-ahead/2026-07-26/lmp-expost
    returned HTTP 401 "Access denied due to missing subscription key" on 2026-07-27, while a fabricated
    path on the same gateway returned HTTP 404 "Resource not found" — which is what makes the 401 meaningful.
    The key is self-serve: MISO''s own portal product metadata returns approvalRequired false. The full
    API reference, every operation definition and the component schemas were all readable anonymously
    from the portal''s data API, and the OpenAPI in openapi/ was assembled verbatim from them.'
  humanURL: https://data-exchange.misoenergy.org/api-details#api=pricing-api
  baseURL: https://apim.misoenergy.org/pricing
  tags:
  - Energy Markets
  - LMP
  - Prices
  - Ancillary Services
  - Day-Ahead
  - Real-Time
  properties:
  - type: OpenAPI
    url: openapi/miso-data-exchange-pricing-api-openapi.json
  - type: Overlay
    url: overlays/miso-data-exchange-pricing-overlay.yaml
  - type: DeveloperPortal
    url: https://data-exchange.misoenergy.org/
  - type: APIReference
    url: https://data-exchange.misoenergy.org/apis
  - type: Documentation
    url: https://help.misoenergy.org/knowledgebase/article/KA-01489/en-us
  - type: Plans
    url: https://data-exchange.misoenergy.org/products
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
- aid: miso:miso-data-exchange-load-generation-interchange-api
  name: MISO Data Exchange Load, Generation, and Interchange API
  description: The system-data half of MISO Data Exchange. Twenty-two documented GET operations spanning
    actual load, day-ahead and real-time cleared demand, day-ahead cleared generation both physical and
    virtual, day-ahead and real-time generation by fuel type, offered and committed generation at ECOMAX
    and ECOMIN, fuel-on-the-margin, day-ahead, real-time and historical net scheduled interchange, real-time
    net actual interchange, real-time binding constraints, real-time and forecast outages, the medium-term
    load forecast, and state estimator load. MISO's own operation metadata carries the warning that interchange
    data is subject to change up to one hundred and five days after the market day due to reconciliation.
    Every operation is date-pathed (/v1/{market}/{yyyy-mm-dd}/...) with optional interval, region and
    paging filters. A subscription key is required — an anonymous GET to https://apim.misoenergy.org/lgi/v1/real-time/2026-07-26/demand/actual
    returned HTTP 401 "Access denied due to missing subscription key" on 2026-07-27 — and that key is
    self-serve with no approval step. The OpenAPI in openapi/ was assembled verbatim from MISO's anonymously
    served portal metadata.
  humanURL: https://data-exchange.misoenergy.org/api-details#api=load-generation-and-interchange-api
  baseURL: https://apim.misoenergy.org/lgi
  tags:
  - Load
  - Generation
  - Interchange
  - Demand Forecast
  - Outages
  - Fuel Mix
  - Energy Markets
  properties:
  - type: OpenAPI
    url: openapi/miso-data-exchange-load-generation-interchange-api-openapi.json
  - type: Overlay
    url: overlays/miso-data-exchange-lgi-overlay.yaml
  - type: DeveloperPortal
    url: https://data-exchange.misoenergy.org/
  - type: APIReference
    url: https://data-exchange.misoenergy.org/apis
  - type: Documentation
    url: https://help.misoenergy.org/knowledgebase/article/KA-01489/en-us
  - type: Plans
    url: https://data-exchange.misoenergy.org/products
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
- aid: miso:miso-market-reports
  name: MISO Market Reports
  description: 'MISO''s long-running bulk market report surface — the second fully anonymous layer of
    its open market data, and the archive the Data Exchange APIs sit on top of. Every published report
    is a plain HTTP GET against docs.misoenergy.org/marketreports/ with no key, no account, no login and
    no licence click-through, returning real CSV, XLSX, XML, ZIP and PDF files named by market date. Confirmed
    anonymous on 2026-07-27: 20260726_da_expost_lmp.csv returned HTTP 200 with 1,165,710 bytes of day-ahead
    ex-post LMP, 20260726_sr_gfm.xlsx returned HTTP 200 with 21,922 bytes, and Dead_Node_Reports_Readers_Guide.pdf
    returned HTTP 200. The report catalogue is browsed from the Market Reports page, which drives an internal
    Episerver Find search service — there is no documented query API, no directory listing (docs.misoenergy.org/marketreports/
    itself returns HTTP 404) and no specification, so this is recorded as a verified public data surface
    rather than a specified API.'
  humanURL: https://www.misoenergy.org/markets-and-operations/real-time--market-data/market-reports/
  baseURL: https://docs.misoenergy.org/marketreports
  tags:
  - Open Data
  - CSV
  - Market Reports
  - Settlements
  - Energy Markets
  - Anonymous Access
  properties:
  - type: Documentation
    url: https://www.misoenergy.org/markets-and-operations/real-time--market-data/market-reports/
  - type: Website
    url: https://www.misoenergy.org/markets-and-operations/real-time--market-data/market-report-archives/
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
- aid: miso:miso-mui-2-0-api
  name: MISO Market User Interface (MUI) 2.0 API
  description: 'The closed counterpart to everything else in this profile — MISO''s programmatic JSON
    web API for registered market participants to submit energy supply offers and demand bids, query submissions,
    and query day-ahead and real-time market results as they clear. MISO documents it publicly in the
    MUI 2.0 API User Guide, which states verbatim that "All market participants using the JSON programmatic
    interface must be registered with MISO" and gives the base URL as https://markets.midwestiso.org/dart2
    for production and https://cce.midwestiso.org/dart2 for the customer-facing test environment. Access
    is gated by a client digital certificate issued through the MISO Market Portal: an anonymous TLS connection
    to markets.midwestiso.org on 2026-07-27 failed at the handshake with an SSL alert rather than returning
    any HTTP status, which is direct evidence of mutual-TLS client-certificate enforcement. No OpenAPI
    is published and none could be harvested; the guide PDF is the only contract.'
  humanURL: https://cdn.misoenergy.org/MUI%202.0%20API%20User%20Guide629008.pdf
  baseURL: https://markets.midwestiso.org/dart2
  tags:
  - Energy Markets
  - Market Participants
  - Bids and Offers
  - Day-Ahead
  - Real-Time
  - Client Certificate
  properties:
  - url: https://cdn.misoenergy.org/MUI%202.0%20Specification%203.3.0623177.yaml
    type: X-OpenAPI-Source
  - url: openapi/miso-mui-20-api-openapi.yaml
    type: OpenAPI
  - type: Documentation
    url: https://cdn.misoenergy.org/MUI%202.0%20API%20User%20Guide629008.pdf
  - type: Onboarding
    url: https://www.misoenergy.org/markets-and-operations/mp-registration/market-participation/
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
common:
- type: AgenticAccess
  url: agentic-access/miso-agentic-access.yml
- type: DomainSecurity
  url: security/miso-domain-security.yml
- type: Authentication
  url: authentication/miso-authentication.yml
- type: Conventions
  url: conventions/miso-conventions.yml
- type: RateLimits
  url: rate-limits/miso-rate-limits.yml
- type: Plans
  url: plans/miso-plans.yml
- type: ErrorCatalog
  url: errors/miso-problem-types.yml
- type: Lifecycle
  url: lifecycle/miso-lifecycle.yml
- type: StatusPage
  url: https://www.misoenergy.org/markets-and-operations/notifications/it-and-system-notifications/
- type: Roadmap
  url: https://www.misoenergy.org/markets-and-operations/MSE/
- type: Conformance
  url: conformance/miso-conformance.yml
- type: DataModel
  url: data-model/miso-data-model.yml
- type: Examples
  url: examples/_index.yml
- type: Packages
  url: packages/miso-packages.yml
- type: Sandbox
  url: sandbox/miso-sandbox.yml
- type: MCPServer
  url: mcp/miso-mcp.yml
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/miso-llms.txt
- type: Website
  url: https://www.misoenergy.org/
- type: DeveloperPortal
  url: https://data-exchange.misoenergy.org/
- type: Documentation
  url: https://www.misoenergy.org/markets-and-operations/RTDataAPIs/
- type: APIReference
  url: https://public-api.misoenergy.org/
- type: Onboarding
  url: https://help.misoenergy.org/knowledgebase/article/KA-01489/en-us
- type: SignUp
  url: https://www.misoenergy.org/account/create-profile/
- type: SignIn
  url: https://data-exchange.misoenergy.org/signin
- type: Plans
  url: https://data-exchange.misoenergy.org/products
- type: TermsOfService
  url: https://www.misoenergy.org/meet-miso/legal-and-privacy/
- type: PrivacyPolicy
  url: https://www.misoenergy.org/meet-miso/legal-and-privacy/
- type: GettingStarted
  url: https://cdn.misoenergy.org/MISO%20Data%20Exchange%20User%20Guide674561.pdf
- type: Support
  url: https://help.misoenergy.org/
- type: Blog
  url: https://www.misoenergy.org/meet-miso/media-center/miso-matters/
- type: LinkedIn
  url: https://www.linkedin.com/company/midcontinent-iso/
- type: YouTube
  url: https://www.youtube.com/user/MISOenergy
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com