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.
Southwest Power Pool publishes 1 API on the APIs.io network: SPP LEP/TROLIE Ratings API. Tagged areas include Energy, United States, Energy Markets, Electricity, and Grid.
Southwest Power Pool’s developer surface includes authentication, sandbox, code examples, developer portal, documentation, getting-started guide, signup flow, and 21 more developer resources.
Regulatory Posture applies to this provider. Its tags matched the
Energy & Utilities regime, so
Regulatory Posture carries 15 points of the composite.
If this regime is wrong for your business, say so on your
provider repo — the
applicability map is public and we will correct it.
The six quality facets above are damped to 85 points between them,
because the conditional facet above carries the other
15. That is why each facet's contribution is shown against a damped
maximum: raising a quality facet moves the composite by 85% of its nominal
weight, not 100%. The full arithmetic is at apis.io/rating/.
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 Integrate...
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 b...
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 applicati...
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 ...
SPP's REST implementation of GE Vernova's Limit Exchange Portal (LEP) using the LF Energy TROLIE (Transmission Ratings and Operating Limits Information Exchange) API specificati...
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 ...
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.'
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-lep-trolie-api
name: SPP LEP/TROLIE Ratings API
description: SPP's REST implementation of GE Vernova's Limit Exchange Portal (LEP) using the LF Energy TROLIE (Transmission
Ratings and Operating Limits Information Exchange) API specification, built to meet FERC Order 881 ambient-adjusted ratings
obligations. SPP published a versioned Data Exchange Guide (v1.0, 8 Nov 2024) covering monitoring sets, forecast ratings,
real-time ratings and seasonal ratings. No production base URL is published — SPP's own guide uses the placeholder https://<baseURL>/
throughout — and access requires an x.509 digital certificate from a CA SPP trusts plus a role assigned in SPP UAA. Not
verifiable anonymously.
humanURL: https://www.spp.org/documents/72496/spp%20lep%20api%20data%20exchange%20guide.pdf
tags:
- Transmission
- Ratings
- TROLIE
- FERC Order 881
- Gated
properties:
- type: Documentation
url: https://www.spp.org/documents/72496/spp%20lep%20api%20data%20exchange%20guide.pdf
- type: OpenAPI
url: openapi/trolie-standard-openapi.yml
- type: Specification
url: https://trolie.energy/spec
- type: Overlay
url: overlays/spp-trolie-standard-overlay.yaml
- type: AgentSkill
name: Exchange transmission ratings with SPP (LEP/TROLIE)
url: skills/spp-trolie-ratings-exchange.md
- 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
common:
- 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
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