# Southwest Power Pool

**Canonical:** https://apis.io/providers/spp/  
**Website:** https://www.spp.org/  
**APIs profiled:** 6

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.

## Kin Score — 53.4 / 100 (developing)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 53.4).

| Facet | Score |
|---|---|
| Discoverability | 83.3 |
| Contract Quality | 62.1 |
| Governance | 16.7 |
| Contract Governance | 16.7 |
| Operational Transparency | 5.3 |
| Developer Ergonomics | 58.9 |
| Commercial Clarity | 42.1 |
| Access Clarity | 42.1 |

Regulatory layer — **Energy & Utilities**: 63.5 (matched via tags).

## Agent readiness — 47.2 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | verified |
| OpenAPI Examples | verified |
| Rate Limit Signal | verified |
| Event Surface Described | no |
| Agent Skills | derived |
| Well Known Catalog | yes |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Open public market data · Member-gated participant APIs — onboarding: unknown, pricing: free, trial: no (confidence: high).

## APIs (6)

- **SPP Public Data FTP** — 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...
- **SPP Portal Public Data File Browser API** — 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...
- **SPP Portal Chart API** — 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...
- **SPP Price Contour Map ArcGIS REST Services** — 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 LEP/TROLIE Ratings API** — 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...
- **SPP Integrated Marketplace Markets Web Service** — 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 ...

## Security (2)

- **Spp Authentication** — none/apiKey/mutualTLS/oauth2/openIdConnect · 5 schemes
- **Spp Domain Security** — TLSv1.2 · HSTS · DMARC

## Tags

Energy, United States, Energy Markets, Electricity, Grid, Utilities, Renewables, Market Data, Transmission, System Operator

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/spp/). Scores are computed from the provider's own public artifacts under a published rubric.