NYISO Day-Ahead Ancillary Prices

Cleared day-ahead ancillary-service capacity prices in NYISO, one row per hour, zone and product.

Ancillary Services data NYISO market

Query with the agent

Native record

product x region x delivery hour

hourly (day-ahead) publication cadence

Evidence

Cleared day-ahead market

A market outcome, not a physical observation

Time basis

Interval-start records

UTC · event_time

Overview

3,918,376 rows, 2016-06 to the next delivery day. Products: spin, non_spin, operating_30, reg_capacity. 11 NYISO zones. price_usd_mw is a price for CAPACITY held in reserve — dollars per megawatt of commitment — not dollars per megawatt-hour of energy delivered. The two are different units and are not comparable to an LMP.

Query contract

Select one product and one region before aggregating. Each row is already the canonical cleared price for that combination.

Analysis rules

Never sum prices across products. Reserve products are separately procured markets and their prices do not add to a meaningful total.
Never sum or average across zones without saying so; 11 nyiso zones.

Interpretation

price_usd_mw is $/MW of capacity held, not $/MWh of energy. Do not compare it directly to an LMP, and do not multiply it by megawatt-hours.
A cleared price is what the day-ahead market settled at. It is not the quantity procured, not a scarcity measurement, and not evidence that reserves were short.

Access

Query from your own tools

Use the guarded HTTP endpoint directly, or connect an MCP client and load the dataset contract with describe_data before calling query_data.

NYISO MCP API reference

HTTP endpoint

POST /api/v1/datasets/nyiso_ancillary_da/query

Need the full history of this dataset in Snowflake, Databricks or your own storage? Data services delivers it on a schedule.

Schema4

Column

Type

event_timeDateTime64(6, 'UTC')

regionLowCardinality(String)

productLowCardinality(String)

price_usd_mwNullable(Float64)

Sample data

event_time	region	product	price_usd_mw
2026-10-13 03:00:00.000000	HUD VL	non_spin	5.87
2026-10-13 03:00:00.000000	NORTH	non_spin	5.87
2026-10-13 03:00:00.000000	DUNWOD	operating_30	5.87
2026-10-13 03:00:00.000000	N.Y.C.	non_spin	5.87
2026-10-13 03:00:00.000000	MHK VL	non_spin	5.87
2026-10-13 03:00:00.000000	DUNWOD	non_spin	5.87
2026-10-13 03:00:00.000000	LONGIL	non_spin	5.87
2026-10-13 03:00:00.000000	DUNWOD	reg_capacity	12.87
2026-10-13 03:00:00.000000	HUD VL	operating_30	5.87
2026-10-13 03:00:00.000000	N.Y.C.	reg_capacity	12.87
2026-10-13 03:00:00.000000	LONGIL	operating_30	5.87
2026-10-13 03:00:00.000000	N.Y.C.	operating_30	5.87
2026-10-13 03:00:00.000000	LONGIL	reg_capacity	12.87
2026-10-13 03:00:00.000000	NORTH	operating_30	5.87
2026-10-13 03:00:00.000000	HUD VL	reg_capacity	12.87
2026-10-13 03:00:00.000000	GENESE	reg_capacity	12.87
2026-10-13 03:00:00.000000	MHK VL	spin	5.87
2026-10-13 03:00:00.000000	HUD VL	spin	5.87
2026-10-13 03:00:00.000000	DUNWOD	spin	5.87
2026-10-13 03:00:00.000000	LONGIL	spin	5.87
2026-10-13 03:00:00.000000	GENESE	spin	5.87
2026-10-13 03:00:00.000000	NORTH	spin	5.87
2026-10-13 03:00:00.000000	N.Y.C.	spin	5.87
2026-10-13 03:00:00.000000	MILLWD	non_spin	5.87
2026-10-13 03:00:00.000000	CENTRL	non_spin	5.87

Coverage

100.0% complete0 gap days9,827 days with data

Show coverage history

Coverage: 100.0%Days with data: 9,827Gaps: 0

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Related ancillary services data

Related ancillary services data
Dataset	Description
Day-Ahead Ancillary Service PricesNYISO · hourly (DAM)	NYISO day-ahead ancillary-service prices by pricing location, keyed by PTID, with separate columns for 10-minute spinning reserve, 10-minute non-synchronous reserve, 30-minute operating reserve, and regulation capacity. These prices show the reserve and regulation stack cleared before the operating day, complementing day-ahead energy LBMP for full market-context analysis.
Real-Time Ancillary Service PricesNYISO · 5-minute	NYISO real-time ancillary-service prices by pricing location, keyed by PTID, with separate columns for 10-minute spinning reserve, 10-minute non-synchronous reserve, 30-minute operating reserve, regulation capacity, and regulation movement. Use this with energy LBMP when analyzing reserve scarcity, regulation value, or storage/operator behavior beyond energy-only dispatch.
Ancillary Service Market Clearing PricesSPP · 5-minute (RTBM) and hourly (Day-Ahead)	Cleared ancillary-service prices by SPP reserve zone for both the real-time balancing market and the day-ahead market. SPP's product set does not map onto other ISOs': regulation clears as a separate service (capacity) price and mileage price in each direction (reg_up_service, reg_up_mile, reg_dn_service, reg_dn_mile), alongside ramp up and down, spinning, supplemental, and uncertainty products. IMPORTANT: reserve_zone mixes two grains. It carries the numeric ancillary reserve zones (1 through 5 under the SPP balancing authority, 21 under the separate SWPW balancing authority) AND the two balancing-authority roll-ups, 'SPP' and 'SWPW', whose prices equal those of their member zones. Aggregating across every value of reserve_zone double-counts the market.
Ancillary Service PricesERCOT · hourly (DAM)	Hourly market clearing prices for the ancillary services ERCOT procures alongside energy in its Day-Ahead Market, broken out by product: Regulation Up (RegUp), Regulation Down (RegDown), Responsive Reserve (RRS), Non-Spinning Reserve (NSPIN), and the ERCOT Contingency Reserve Service (ECRS). These prices represent what the grid pays per megawatt to hold capacity in reserve for frequency control and contingency response, separate from the energy itself. Watching them shows when reserves are scarce and expensive (often during tight or volatile conditions), which informs how generators and storage operators allocate capacity between energy and reserve markets, and gives researchers a read on the cost of keeping the Texas grid reliable. ECRS, added in 2023, is the newest of these products and has at times cleared at notably high levels.