NYISO · Ancillary
NYISO day-ahead ancillary prices
Hourly day-ahead clearing prices for NYISO's reserves and regulation capacity in each of its eleven zones, posted for tomorrow each morning.
nyiso-dam-asdaily, morning ET · 1h rows11 entitiesWhat is in it
- Updates
- daily, morning ET · 1h rows
- Entities
- 11 entities — N.Y.C., LONGIL, WEST…
- Source timezone
- US Eastern — every timestamp Dryos serves is UTC
- Coverage
- 14 September 2026 to now
- Rows held
- 1,320
- Primary key
- iso, zone, interval_start_utc
What it measures
Every value, its unit, and what the source means by it.
- 10-min spinning$/MWh
Ten-minute spinning reserve clearing price.
spin_10min_mcp - 10-min non-sync$/MWh
Ten-minute non-synchronous reserve clearing price.
nonsync_10min_mcp - 30-min operating$/MWh
Thirty-minute operating reserve clearing price.
operating_30min_mcp - Regulation capacity$/MWh
Regulation capacity clearing price.
reg_capacity_mcp
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: five minutes before the real-time stamp (an interval's end); the day-ahead stamp is the hour's start.e.g. 2026-09-14T04:00:00Z |
| isorequired | string | Publishing ISO.e.g. NYISO |
| zonerequired | string | Load zone as NYISO names it: CAPITL, CENTRL, DUNWOD, GENESE, HUD VL, LONGIL, MHK VL, MILLWD, N.Y.C., NORTH, WEST.e.g. N.Y.C. |
| spin_10min_mcprequired | number | Clearing price for ten-minute spinning reserve, $/MWh.e.g. 4.0 |
| nonsync_10min_mcprequired | number | Clearing price for ten-minute non-synchronous reserve, $/MWh.e.g. 4.0 |
| operating_30min_mcprequired | number | Clearing price for thirty-minute operating reserve, $/MWh.e.g. 4.0 |
| reg_capacity_mcprequired | number | Clearing price for regulation capacity, $/MWh.e.g. 4.0 |
| reg_movement_mcp | number | Clearing price for regulation movement, $/MW.e.g. 4.0 |
| source_published_at_utc | timestamp | When NYISO published the row. |
| collected_at_utcrequired | timestamp | When Dryos collected this row, UTC. Stamped by the platform, not the collector.e.g. 2026-09-14T22:35:00Z |
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/nyiso-dam-as/query?node=N.Y.C.&limit=12"The catalogue entry — every column, its type and the source
curl "https://api.dryos.ai/v1/datasets/nyiso-dam-as"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 10-min spinning been at N.Y.C. 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 NYISO's MIS.
Every other operator's day-ahead reserve prices were here and NYISO's were not. Reconciled against the live files on 2026-09-14: every check passed.
How this stream is checked
- Pulled straight from NYISO MIS · Day-Ahead Ancillary Service Prices — 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, morning ET; the interval timestamp is the start of the interval, in UTC.
- NYISO stamps its files in Eastern prevailing time with no zone column. Every timestamp Dryos serves is UTC.
Related streams
- NYISO real-time ancillary pricesNYISO
Five-minute clearing prices for NYISO's reserves and regulation — ten-minute spinning and non-synchronous, thirty-minute operating, regulation capacity and movement — in each of its eleven zones.
every 5 min · 5m rows11 entitiesnyiso-rt-as - SPP day-ahead ancillary pricesSPP
Hourly day-ahead clearing prices for SPP's reserve products — regulation up and down, spinning, supplemental, ramp capability and uncertainty reserve — in every reserve zone, posted for the whole of tomorrow each afternoon.
daily, afternoon CT · 1h rows8 entitiesspp-dam-as - CAISO day-ahead ancillary pricesCAISO
Hourly day-ahead clearing prices for regulation up and down, spinning and non-spinning reserve and regulation mileage, in CAISO's six ancillary service regions — the system, north and south of Path 26, each with and without the interties.
daily, early afternoon PT · 1h rows6 entitiescaiso-dam-as - NYISO interface flowsNYISO
Flow every five minutes across each of NYISO's transfer interfaces — Total East, Central East, UPNY-ConEd and the ties with PJM, New England, Ontario and Quebec — against the limits it is held to.
every 5 min · 5m rows19 entitiesnyiso-interface-flows - NYISO real-time binding constraintsNYISO
Every transmission facility NYISO's real-time dispatch was up against, five minutes at a time, with the contingency it bound for and its constraint cost.
every 5 min, when bound · 5m rows4 entitiesnyiso-rt-shadow-prices - NYISO day-ahead binding constraintsNYISO
Every transmission facility that bound in NYISO's day-ahead market, hour by hour, with the contingency it bound for and its constraint cost, posted for tomorrow each morning.
daily, morning ET · 1h rows11 entitiesnyiso-dam-shadow-prices