SPP · Pricing
SPP day-ahead binding constraints
Every transmission constraint that bound in SPP's day-ahead market, hour by hour, with the contingency it bound for and its shadow price, posted for the whole of tomorrow each afternoon.
spp-dam-shadow-pricesdaily, afternoon CT · 1h rows84 entitiesWhat is in it
- Updates
- daily, afternoon CT · 1h rows
- Entities
- 84 entities — OSAWEBCLESOO, SOONER_SONR_SONR_PHSHFT_PS, TMP630_33215…
- Source timezone
- US Central — every timestamp Dryos serves is UTC
- Coverage
- 14 September 2026 to now
- Rows held
- 2,874
- Primary key
- iso, constraint_name, contingency, interval_start_utc
What it measures
Every value, its unit, and what the source means by it.
- Shadow price$/MWh
The constraint's shadow price for the hour, in SPP's sign — negative almost always.
shadow_price
Columns
Exactly what a request answers with, read from the API rather than written here.
| Column | Type | Description |
|---|---|---|
| interval_start_utcrequired | timestamp | Start of the interval, UTC. SPP stamps the interval's end.e.g. 2026-09-14T19:55:00Z |
| isorequired | string | Publishing ISO.e.g. SPP |
| constraint_namerequired | string | The constraint as SPP names it, verbatim: often a temporary flowgate (`TMP845_30027`), otherwise a name built from its elements.e.g. TMP845_30027 |
| contingencyrequired | string | The outaged element the constraint is monitored for, SPP's Contingent Facility verbatim; BASE when none.e.g. WR:MARSHAL3 SSEN:115:2:12 |
| constraint_typerequired | string | SPP's type code: FG (flowgate) and M2M (market-to-market, coordinated with MISO) in real time; FG, MA and MCE in the day-ahead market.e.g. FG |
| staterequired | string | BINDING, BREACHED (past its limit), or ACTIVATED — in the dispatch but not binding, at a shadow price of zero (real time only).e.g. BINDING |
| shadow_pricerequired | number | The constraint's shadow price for the interval, $/MWh, in SPP's sign: zero or negative almost always.e.g. -36.9883 |
| monitored_facilityrequired | string | The element whose flow the constraint limits, as SPP spells it.e.g. LN MARSHAL3 - KNOB |
| nerc_id | string | NERC's flowgate id.e.g. 30027 |
| interconnect | string | The interconnection the constraint sits in: E (Eastern) on every row read.e.g. E |
| contingency_idrequired | string | SPP's contingency number (its Contingency Name column), or BASE.e.g. 25296 |
| source_published_at_utc | timestamp | When SPP published the row. |
| collected_at_utcrequired | timestamp | When Dryos collected this row, UTC. Stamped by the platform, not the collector.e.g. 2026-09-14T20:01:12Z |
Read it
Public, read-only, no key and no sign-up. Relative times stay relative, so a URL keeps working.
The newest rows
curl "https://api.dryos.ai/v1/datasets/spp-dam-shadow-prices/query?node=OSAWEBCLESOO&limit=12"The catalogue entry — every column, its type and the source
curl "https://api.dryos.ai/v1/datasets/spp-dam-shadow-prices"Full parameters — bucketing, aggregation, filters and search — are on the API reference.
Ask an agent
The same stream through the Model Context Protocol, so Claude, ChatGPT, Cursor or any MCP client can query it directly.
claude mcp add --transport http dryos https://api.dryos.ai/mcpThen ask:
What has Shadow price been at OSAWEBCLESOO over the last 24 hours, and when did it peak?
Setup for every client is on the MCP server page.
Changes to this collector
A change in the collector is a change in the data. Anyone reading a step in a series is owed the day it moved under them.
- 2026-09-14
First collected, from SPP's marketplace portal.
CAISO's and PJM's day-ahead constraints were here and SPP's were not. Reconciled against the live files on 2026-09-14: every check passed.
How this stream is checked
- Pulled straight from SPP Marketplace Portal · DA Binding Constraints — no reseller in between — and compared against that file before it is served.
- Null means the source did not report it — never zero.
- A reading lands daily, afternoon CT; the interval timestamp is the start of the interval, in UTC.
- SPP publishes on US Central prevailing time, with a UTC column on every row. Every timestamp Dryos serves is UTC.
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