SPP · Pricing
SPP real-time binding constraints
Every transmission constraint in SPP's real-time dispatch, five minutes at a time — binding, breached, or activated at a zero price — with the contingency it is monitored for, its limits and its shadow price.
spp-rt-shadow-pricesevery 5 min · 5m rows88 entitiesWhat is in it
- Updates
- every 5 min · 5m rows
- Entities
- 88 entities — TMP845_30027, TMP459_32122, TP1125_33384…
- Source timezone
- US Central — every timestamp Dryos serves is UTC
- Coverage
- 14 September 2026 to now
- Rows held
- 97,950
- 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 interval, in SPP's sign — zero or negative. Zero on every activated, non-binding constraint.
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 |
| tlr_levelrequired | string | NERC transmission loading relief level in force: CME on almost every row (3A on 35 of 19,436 over 2026-09-13).e.g. CME |
| source_limitrequired | number | The facility's limit from its source rating, MW.e.g. 70 |
| rt_effective_limitrequired | number | The limit in effect in the real-time run, MW.e.g. 63.7 |
| initial_effective_limitrequired | number | The initial effective limit, MW.e.g. 67.9 |
| 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-rt-shadow-prices/query?node=TMP845_30027&limit=12"The catalogue entry — every column, its type and the source
curl "https://api.dryos.ai/v1/datasets/spp-rt-shadow-prices"Hourly averages for the last day
curl "https://api.dryos.ai/v1/datasets/spp-rt-shadow-prices/query?node=TMP845_30027&start=-24h&interval=1h&agg=avg"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 TMP845_30027 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 binding constraints were here and SPP's were not. Reconciled against the live files on 2026-09-14: every check passed; activated constraints are kept beside the binding ones.
How this stream is checked
- Pulled straight from SPP Marketplace Portal · RTBM 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 every 5 min; 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.
Related streams
- SPP real-time LMPSPP
Real-time balancing market prices at every SPP settlement location — the trading hubs, load areas, resources, demand response and the interfaces with its neighbours — with the energy, congestion and loss components, every five minutes.
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Hourly day-ahead prices at every SPP settlement location — the trading hubs, load areas, resources, demand response and the interfaces with its neighbours — with the energy, congestion and loss components, posted for the whole of tomorrow each afternoon.
daily, afternoon CT · 1h rows1,612 entitiesspp-dam-lmp - SPP real-time bus LMPSPP
Real-time balancing market prices at every SPP electrical bus — about 9,250 of them, the western market included — with the energy, congestion and loss components, every five minutes.
every 5 min · 5m rows9,252 entitiesspp-rt-lmp-bus - SPP day-ahead bus LMPSPP
Hourly day-ahead prices at every SPP electrical bus, the western market included, with the energy, congestion and loss components, posted for the whole of tomorrow each afternoon.
daily, afternoon CT · 1h rows9,252 entitiesspp-dam-lmp-bus - SPP day-ahead binding constraintsSPP
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.
daily, afternoon CT · 1h rows84 entitiesspp-dam-shadow-prices - CAISO real-time binding constraintsCAISO
Every transmission constraint CAISO's real-time dispatch was up against, five minutes at a time, with the contingency it bound for and its shadow price.
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