Southwest Power Pool

aid: spp
url: https://raw.githubusercontent.com/api-evangelist/spp/refs/heads/main/apis.yml
name: Southwest Power Pool
kind: company
description: 'Southwest Power Pool (SPP) is a nonprofit Regional Transmission Organization regulated by the Federal Energy
  Regulatory Commission and headquartered in Little Rock, Arkansas. Founded in 1941 and approved as an RTO in 2004, SPP operates
  the Integrated Marketplace day-ahead and real-time balancing markets, the Western Energy Imbalance Service (WEIS) market,
  Western Reliability Coordination services, and is building the Markets+ day-ahead market for the West with a targeted 2027
  go-live. SPP sits at the wholesale layer of the United States energy value chain: it dispatches generation, prices congestion,
  plans transmission, and settles the market for its member utilities — it has no retail customers, so no consumer energy-data
  mandate such as Green Button applies to it. Its API posture is a clean split. Market and grid data is genuinely open: locational
  marginal prices, market clearing prices, operating reserves, load, generation mix, VER curtailments and outage capacity
  are served anonymously as CSV from the SPP Portal file browser and from an anonymous public FTP site, with an Esri ArcGIS
  REST price-contour service alongside — no account, no key, no licence click-through. Everything a market participant actually
  transacts against is the opposite: the Integrated Marketplace SOAP web services, the Settlement Management System API, and
  the FERC Order 881 LEP/TROLIE ratings API are member-only, require an OATI webCARES x.509 digital certificate plus an SPP
  UAA role, and SPP publishes no base URL and no OpenAPI for them.'
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: free
  onboarding: none-published
  trial: false
  try_now: true
  public: true
  label: Open public market data · Member-gated participant APIs
  confidence: high
  source:
  - probe
  - documentation
  generated: '2026-07-27'
  method: manual
image: https://www.spp.org/logo.png
tags:
- Energy
- United States
- Energy Markets
- Electricity
- Grid
- Utilities
- Renewables
- Market Data
- Transmission
- System Operator
created: '2026-07-27'
modified: '2026-07-27'
specificationVersion: '0.23'
apis:
- aid: spp:spp-public-data-ftp
  name: SPP Public Data FTP
  description: 'SPP''s officially documented programmatic interface to its public data. The SPP Public Data Access guide (v3.0,
    July 2023) names FTP as the programmatic access path for Integrated Marketplace, Western Reliability Coordination and
    WEIS public data. Verified anonymously on 2026-07-27: a listing returned FTP status 226 with top-level directories including
    Markets, Operational_Data, Operations_Reports, Settlements, Reliability, TCR, Market_Monitoring and West_EIS. No account,
    key or licence agreement is required.'
  humanURL: https://spp.org/documents/28853/spp%20public%20data%20access%2020230707.pdf
  baseURL: ftp://pubftp.spp.org
  tags:
  - Public Data
  - Market Data
  - FTP
  properties:
  - type: Documentation
    url: https://spp.org/documents/28853/spp%20public%20data%20access%2020230707.pdf
  - type: Documentation
    url: https://www.spp.org/stakeholder-center/user-guides-apis-integrations/
- aid: spp:spp-portal-file-browser-api
  name: SPP Portal Public Data File Browser API
  description: The HTTP download service behind the SPP Portal public data pages. Anonymous GET requests of the form /file-browser-api/download/{dataset}?path={file}
    return CSV for real-time balancing market LMP by settlement location, real-time and day-ahead market clearing prices,
    operating reserves, hourly load, historical generation mix, VER curtailments, capacity of generation on outage, and the
    WEIS market equivalents. Eight dataset paths were confirmed HTTP 200 with content-type text/csv on 2026-07-27 with no
    credentials. SPP documents the datasets and file formats in its Markets Public Data Guide but does not publish this HTTP
    path as a supported interface specification — FTP is the interface SPP formally supports.
  humanURL: https://portal.spp.org/pages/rtbm-lmp-by-location
  baseURL: https://portal.spp.org/file-browser-api/download
  tags:
  - Public Data
  - Market Data
  - LMP
  - Load
  - Generation Mix
  properties:
  - type: Documentation
    url: https://portal.spp.org/pages/rtbm-lmp-by-location
  - type: Documentation
    url: https://www.spp.org/documents/19541/spp%20markets%20public%20data%20guide.pdf
  - type: AgentSkill
    name: Pull SPP public market data
    url: skills/spp-public-market-data.md
  - type: Examples
    url: examples/_index.yml
- aid: spp:spp-portal-chart-api
  name: SPP Portal Chart API
  description: 'JSON and CSV chart feeds serving the SPP Portal dashboards. Confirmed anonymously on 2026-07-27: /chart-api/gen-mix/asChart
    and /chart-api/load-forecast/asChart return application/json with labelled hourly datasets by fuel type and load forecast
    series, and /chart-api/gen-mix-365/asFile returns a rolling 365-day generation mix CSV. Undocumented as a formal interface
    specification; served without authentication.'
  humanURL: https://portal.spp.org/pages/generation-mix-historical
  baseURL: https://portal.spp.org/chart-api
  tags:
  - Public Data
  - Generation Mix
  - Load Forecast
  properties:
  - type: Documentation
    url: https://portal.spp.org/pages/generation-mix-historical
- aid: spp:spp-price-contour-map-arcgis
  name: SPP Price Contour Map ArcGIS REST Services
  description: 'An Esri ArcGIS Server REST directory serving the geospatial layers behind SPP''s price contour map. Confirmed
    anonymously on 2026-07-27 at ArcGIS 11.5: the service root returned JSON listing the PCM and Utilities folders, and the
    PCM folder listed DA_Features, DA_LMP, DELTA_Features, DELTA_LMP, RTBM_Features, RTBM_LMP, States and Transmission MapServer
    services. Follows the standard Esri ArcGIS REST API contract (?f=json), not an SPP-authored specification.'
  humanURL: https://pricecontourmap.spp.org/arcgis/rest/services
  baseURL: https://pricecontourmap.spp.org/arcgis/rest/services
  tags:
  - Geospatial
  - Market Data
  - LMP
  - ArcGIS
  properties:
  - type: APIReference
    url: https://pricecontourmap.spp.org/arcgis/rest/services?f=json
- aid: spp:spp-integrated-marketplace-web-services
  name: SPP Integrated Marketplace Markets Web Service
  description: The SOAP web and notification services market participants use to submit offers and bids and retrieve results
    from the SPP Integrated Marketplace, with WEIS Markets Web Service as the western equivalent and the Settlement Management
    System API for settlements. SPP's System Interfaces Stakeholder Reference Guide (v1.0, 29 Jan 2025) names these as SOAP
    and REST services over HTTPS requiring two-factor authentication; the Markets+ platform is stated to move to RESTful APIs.
    WSDLs, XSDs and endpoint URLs are published only inside the member-facing Change User Forum technical reference documents
    and were not retrievable anonymously; no base URL is public.
  humanURL: https://www.spp.org/documents/73131/spp%20system%20interfaces%20stakeholder%20reference%20guide%2020250129.pdf
  tags:
  - SOAP
  - Wholesale Markets
  - Settlement
  - Gated
  tags_raw:
  - SOAP
  - Wholesale Markets
  - Settlements
  - Gated
  properties:
  - type: Documentation
    url: https://www.spp.org/documents/73131/spp%20system%20interfaces%20stakeholder%20reference%20guide%2020250129.pdf
  - type: Documentation
    url: https://www.spp.org/stakeholder-center/user-guides-apis-integrations/
  - type: Documentation
    url: https://www.spp.org/documents/18307/digital%20certificates%20and%20the%20integrated%20marketplace%20doc_final.pdf
- aid: spp:spp-forecasting-api
  name: Southwest Power Pool Forecasting API
  description: 'The Forecasting API operations define the exchange of forecasted ratings,

    including the 240-hour-ahead forecasted AAR data exchange required by FERC

    Order 881.  The operations support submitting rating proposals, querying

    in-use limits, and monitoring the health and validity of submissions

    against the Rating Provider''s obligations.'
  humanURL: https://spp.org/documents/28853/spp%20public%20data%20access%2020230707.pdf
  baseURL: ftp://pubftp.spp.org
  tags:
  - Forecasting
  properties:
  - type: OpenAPI
    url: openapi/spp-forecasting-api-openapi.yml
  - type: Documentation
    url: https://www.spp.org/documents/72496/spp%20lep%20api%20data%20exchange%20guide.pdf
  - type: Specification
    url: https://trolie.energy/spec
- aid: spp:spp-monitoring-sets-api
  name: Southwest Power Pool Monitoring Sets API
  description: '[Monitoring Sets](https://trolie.energy/concepts#monitoring-sets) are

    named sets of power system resources that may be used to filter ratings

    and limits returned by queries against these APIs. How Monitoring Sets are

    defined is beyond the scope of the TROLIE specification, and it is assumed

    that the sender and receiver have predefined the appropriate Monitoring

    Sets.'
  humanURL: https://spp.org/documents/28853/spp%20public%20data%20access%2020230707.pdf
  baseURL: ftp://pubftp.spp.org
  tags:
  - Monitoring Sets
  properties:
  - type: OpenAPI
    url: openapi/spp-monitoring-sets-api-openapi.yml
  - type: Documentation
    url: https://www.spp.org/documents/72496/spp%20lep%20api%20data%20exchange%20guide.pdf
  - type: Specification
    url: https://trolie.energy/spec
- aid: spp:spp-real-time-api
  name: Southwest Power Pool Real Time API
  description: 'If permitted by the Clearinghouse Provider, its Ratings Providers can use

    these functions to exchange real-time ratings, supplementing or replacing

    traditional telemetry protocols like ICCP.


    These ratings are based on real-time measurements of ambient conditions

    and will be used by Transmission Providers for real-time grid operations

    processes, including state estimation and real-time markets.  The clearing

    of real-time ratings may be more frequent than for forecast ratings, but

    the frequency is the prerogative of the Clearinghouse Provider.


    These ratings may be either AARs or DLRs.'
  humanURL: https://spp.org/documents/28853/spp%20public%20data%20access%2020230707.pdf
  baseURL: ftp://pubftp.spp.org
  tags:
  - Real-Time
  properties:
  - type: OpenAPI
    url: openapi/spp-real-time-api-openapi.yml
  - type: Documentation
    url: https://www.spp.org/documents/72496/spp%20lep%20api%20data%20exchange%20guide.pdf
  - type: Specification
    url: https://trolie.energy/spec
- aid: spp:spp-seasonal-api
  name: Southwest Power Pool Seasonal API
  description: 'Seasonal ratings are static ratings associated with extended durations,

    typically months. These are typically used in both planning and

    operations.


    Power system resources that are exempt from providing AARs generally

    operate at a seasonal rating. Even for resources using dynamic ratings, a

    seasonal rating is still necessary. This acts as a recourse when a dynamic

    rating is unavailable.  For example, a dynamic rating

    might be unavailable during communication outages or for forecasts beyond

    the ten-day period required by FERC Order 881.'
  humanURL: https://spp.org/documents/28853/spp%20public%20data%20access%2020230707.pdf
  baseURL: ftp://pubftp.spp.org
  tags:
  - Seasonal
  properties:
  - type: OpenAPI
    url: openapi/spp-seasonal-api-openapi.yml
  - type: Documentation
    url: https://www.spp.org/documents/72496/spp%20lep%20api%20data%20exchange%20guide.pdf
  - type: Specification
    url: https://trolie.energy/spec
- aid: spp:spp-seasonal-overrides-api
  name: Southwest Power Pool Seasonal Overrides API
  description: 'A Seasonal Override instructs the system to use a temporary static rating

    instead of any concurrent Seasonal Rating for a resource.


    A typical use case is a so-called ''de-rate'' due to a temporary clearance

    issue for a transmission facility that is exempt from providing AARs.


    Exempt facilities typically operate at a seasonal rating. However, instead

    of updating the seasonal rating schedule, a Ratings Provider can send a

    Seasonal Override.


    During the override period, the Clearinghouse uses the Seasonal

    Override rating instead of any scheduled seasonal ratings.


    For resources required to provide AARs, a Ratings Provider would issue a

    Temporary AAR Exception to address temporary conditions requiring a static

    rating.'
  humanURL: https://spp.org/documents/28853/spp%20public%20data%20access%2020230707.pdf
  baseURL: ftp://pubftp.spp.org
  tags:
  - Seasonal Overrides
  properties:
  - type: OpenAPI
    url: openapi/spp-seasonal-overrides-api-openapi.yml
  - type: Documentation
    url: https://www.spp.org/documents/72496/spp%20lep%20api%20data%20exchange%20guide.pdf
  - type: Specification
    url: https://trolie.energy/spec
- aid: spp:spp-temporary-aar-exceptions-api
  name: Southwest Power Pool Temporary AAR Exceptions API
  description: "A [Temporary AAR Exception](https://trolie.energy/concepts#temporary-aar-exception) is\nprovided by the Ratings\
    \ Provider when a Ratings Obligation cannot be\nfulfilled, due to some temporary operating condition impacting the related\n\
    power system resource.  This could occur in various scenarios:\n\n  * An equipment failure.\n  * An unforeseen condition\
    \ on a related part of the power grid.\n  * Some ambient condition that is not part of the model is heating the\n    line,\
    \ like a wildfire.\n  * Something in the surrounding environment is affecting the amount that a\n    line is allowed to\
    \ sag. For example, this may occur for lines over\n    rivers when very large ships pass under them\n\nA Temporary AAR\
    \ Exception serves two main purposes: documenting the reason\nfor the exception and providing a temporary rating value\
    \ set. It is employed\nin three distinct circumstances:\n\n1. Firstly, Order 881 mandates documentation and archival of\
    \ all use of\n alternate ratings in lieu of AARs. Ratings Providers should continue to\n provide real-time and forecast\
    \ ratings for the affected resource, but\n these should match the rating provided with the Temporary AAR Exception\n while\
    \ the latter is in effect. This temporary rating, and the reason that\n it occurred, must be captured in history regardless\
    \ of the provided\n ratings.  The reason and the end date of the effective window may be\n updated after the object has\
    \ been created, up to a configurable threshold.\n\n   If the Ratings Providers provides ratings that deviate from the\
    \ static\n   Temporary AAR Exception rating, the Clearinghouse Provider must decide\n   whether to use those or the static\
    \ rating. The Clearinghouse Provider\n   advise its Ratings Providers on how it will choose ahead of time. This\n   specification\
    \ recommends using the dynamic rating provided, but it does\n   not mandate it.\n\n2. Secondly, Temporary AAR Exceptions\
    \ apply when the Clearinghouse\n  Provider is generating forecast rating proposals on behalf of the Ratings Provider,\
    \ e.g., when lookup tables are provided ahead of time by the Ratings Provider.\n  Since there is no external ratings,\
    \ the Clearinghouse Provider\n  wouldn't otherwise know that a temporary static rating is needed. \n\n3. Finally, for\
    \ facilities where dynamic ratings are provided, it is\n  possible that a communications outage or other issue could prevent\
    \ the\n  Clearinghouse Provider from receiving the dynamic ratings. In this case,\n  the Clearinghouse Provider would\
    \ use a Temporary AAR Exception rating."
  humanURL: https://spp.org/documents/28853/spp%20public%20data%20access%2020230707.pdf
  baseURL: ftp://pubftp.spp.org
  tags:
  - Temporary AAR Exceptions
  properties:
  - type: OpenAPI
    url: openapi/spp-temporary-aar-exceptions-api-openapi.yml
  - type: Documentation
    url: https://www.spp.org/documents/72496/spp%20lep%20api%20data%20exchange%20guide.pdf
  - type: Specification
    url: https://trolie.energy/spec
common:
- type: Overlay
  url: overlays/spp-trolie-standard-overlay.yaml
- type: AgentSkill
  url: skills/spp-trolie-ratings-exchange.md
- type: DomainSecurity
  url: security/spp-domain-security.yml
- type: OAuthScopes
  url: scopes/spp-scopes.yml
- type: Authentication
  url: authentication/spp-authentication.yml
- type: WellKnown
  url: well-known/spp-well-known.yml
- type: Conventions
  url: conventions/spp-conventions.yml
- type: ErrorCatalog
  url: errors/spp-problem-types.yml
- type: RateLimits
  url: rate-limits/spp-rate-limits.yml
- type: Lifecycle
  url: lifecycle/spp-lifecycle.yml
- type: Conformance
  url: conformance/spp-conformance.yml
- type: DataModel
  url: data-model/spp-data-model.yml
- type: Sandbox
  url: sandbox/spp-sandbox.yml
- type: Packages
  url: packages/spp-packages.yml
- type: Examples
  url: examples/_index.yml
- type: LLMsTxt
  url: llms/spp-llms.txt
- type: AgentSkill
  url: skills/_index.yml
- type: Website
  url: https://www.spp.org/
- type: Portal
  url: https://portal.spp.org/
- type: Documentation
  url: https://www.spp.org/stakeholder-center/user-guides-apis-integrations/
- type: GettingStarted
  url: https://spp.org/documents/28853/spp%20public%20data%20access%2020230707.pdf
- type: Roadmap
  url: https://www.spp.org/stakeholder-center/spp-roadmap/
- type: Compliance
  url: https://www.spp.org/stakeholder-center/spp-rto-compliance/
- type: SignUp
  url: https://www.spp.org/account/create-account/
- type: TermsOfService
  url: https://www.spp.org/terms-conditions/
- type: PrivacyPolicy
  url: https://www.spp.org/terms-conditions/
- type: Support
  url: https://rms.spp.org/
- type: Blog
  url: https://www.spp.org/newsroom/
- type: LinkedIn
  url: https://www.linkedin.com/company/southwest-power-pool
- type: Twitter
  url: https://www.twitter.com/spporg
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com