CAISO · Pricing
CAISO day-ahead binding constraints
Every transmission constraint CAISO's day-ahead market bound on, hour by hour, with the contingency it bound for and its shadow price, posted for the whole of tomorrow each afternoon. The set of constraints is whatever the grid did that day.
caiso-dam-shadow-pricesdaily, early afternoon PT · 1h rows32 entitiesWhat is in it
- Updates
- daily, early afternoon PT · 1h rows
- Entities
- 32 entities — 31336_HPLND JT_60.0_31370_CLVRDLJT_60.0_BR_1 _1, 24701_KRAMER _230_24601_VICTOR _230_BR_2 _1, 7820_TL 230S_OVERLOAD_NG…
- Source timezone
- US Pacific — every timestamp Dryos serves is UTC
- Coverage
- 14 September 2026 to now
- Rows held
- 1,465
- 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 CAISO's sign.
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, read from OASIS's GMT column.e.g. 2026-09-14T17:00:00Z |
| isorequired | string | Publishing ISO.e.g. CAISO |
| constraint_namerequired | string | The constrained element as OASIS names it, verbatim: a branch ends `_BR_n _1`, a transformer `_XF_n`, a nomogram `_NG`. Inner spaces kept.e.g. 24701_KRAMER _230_24601_VICTOR _230_BR_2 _1 |
| contingencyrequired | string | The contingency the constraint bound for, as OASIS lists it. `Base Case` when none.e.g. PG1 LOSBNS-MIDWAY 500 2 |
| shadow_pricerequired | number | The constraint's shadow price for the interval, $/MWh, in CAISO's sign: positive on branches and transformers, negative on nomograms almost always.e.g. 14.67 |
| source_published_at_utc | timestamp | When CAISO published the row, UTC. |
| collected_at_utcrequired | timestamp | When Dryos collected this row, UTC. Stamped by the platform, not the collector.e.g. 2026-09-14T18:32:12Z |
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/caiso-dam-shadow-prices/query?node=31336_HPLND%20JT_60.0_31370_CLVRDLJT_60.0_BR_1%20_1&limit=12"The catalogue entry — every column, its type and the source
curl "https://api.dryos.ai/v1/datasets/caiso-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 31336_HPLND JT_60.0_31370_CLVRDLJT_60.0_BR_1 _1 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 CAISO OASIS.
The binding constraints PJM already had. Reconciled against a live response on 2026-09-14.
How this stream is checked
- Pulled straight from CAISO OASIS · PRC_NOMOGRAM (day-ahead market) — 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, early afternoon PT; the interval timestamp is the start of the interval, in UTC.
- CAISO's market clock is US Pacific; OASIS answers in UTC. Every timestamp Dryos serves is UTC.
Related streams
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Real-time dispatch prices at every CAISO aggregated pricing node — the NP15, SP15 and ZP26 trading hubs, the utilities' load aggregation points, resources, and the pricing points of every Western Energy Imbalance Market area — with the energy, congestion, loss and greenhouse-gas components, every five minutes.
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Prices from CAISO's fifteen-minute market at every aggregated pricing node — the trading hubs, load aggregation points, resources and Western EIM areas — with the energy, congestion, loss and greenhouse-gas components, posted about 25 minutes before each interval.
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Hourly day-ahead prices at every node CAISO clears in its day-ahead market — the NP15, SP15 and ZP26 trading hubs, the utilities' load aggregation points, resources and PacifiCorp's Extended Day-Ahead Market nodes — with the energy, congestion, loss and greenhouse-gas components, posted for the whole of tomorrow each afternoon.
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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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Every binding transmission constraint in the day-ahead market with its limit, cleared flow and shadow price — why nodal prices diverge from the lambda.
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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