ERCOT Day-Ahead Ancillary Prices

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

Ancillary Services data ERCOT market

Query with the agent

Native record

product 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

365,717 rows, 2017-01 to the next delivery day. Products: reg_up, reg_down, spin, non_spin, ecrs. ERCOT procures ancillary services system-wide, so there is no region column — one price per product per hour. 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 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.
Averaging over hours gives a simple average clearing price, not a procurement-weighted cost. Say which you computed.

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.

ERCOT MCP API reference

HTTP endpoint

POST /api/v1/datasets/ercot_ancillary_da/query

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

Schema3

Column

Type

event_timeDateTime64(6, 'UTC')

productLowCardinality(String)

price_usd_mwNullable(Float64)

Sample data

event_time	product	price_usd_mw
2026-10-13 05:00:00.000000	reg_up	4.9
2026-10-13 05:00:00.000000	ecrs	4.39
2026-10-13 05:00:00.000000	non_spin	8.86
2026-10-13 05:00:00.000000	reg_down	1
2026-10-13 05:00:00.000000	spin	4.24
2026-10-13 04:00:00.000000	spin	4.94
2026-10-13 04:00:00.000000	reg_up	4.57
2026-10-13 04:00:00.000000	reg_down	1
2026-10-13 04:00:00.000000	ecrs	5.1
2026-10-13 04:00:00.000000	non_spin	17.99
2026-10-13 03:00:00.000000	reg_up	10.01
2026-10-13 03:00:00.000000	ecrs	10
2026-10-13 03:00:00.000000	reg_down	1.81
2026-10-13 03:00:00.000000	spin	9.11
2026-10-13 03:00:00.000000	non_spin	22.02
2026-10-13 02:00:00.000000	reg_up	3.34
2026-10-13 02:00:00.000000	reg_down	1.05
2026-10-13 02:00:00.000000	spin	3.95
2026-10-13 02:00:00.000000	ecrs	5.3
2026-10-13 02:00:00.000000	non_spin	20.2
2026-10-13 01:00:00.000000	ecrs	2.21
2026-10-13 01:00:00.000000	reg_down	0.76
2026-10-13 01:00:00.000000	spin	2
2026-10-13 01:00:00.000000	reg_up	2
2026-10-13 01:00:00.000000	non_spin	15.87

Coverage

100.0% complete0 gap days4,548 days with data

Show coverage history

Coverage: 100.0%Days with data: 4,548Gaps: 0

2026

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Related ancillary services data

Related ancillary services data
Dataset	Description
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.
Ancillary-service capacity monitor HTMLERCOT · Publisher snapshot	ERCOT's Ancillary-service capacity monitor HTML. Each row preserves a publisher record, workbook row, or report document with its source member and row index. Source timestamps, units, geographic scope, and revision qualifiers are retained in record_json; event_time is collection time; completed_at is when the entire document became available.
DAM Energy Storage Resource Data (60-Day)ERCOT · hourly (DAM), 60-day disclosure	What each ERCOT battery offered into the Day-Ahead Market and what it was awarded, hour by hour, from the 60-Day DAM Disclosure Reports. Like the SCED storage file this subreport begins at RTC+B go-live on 6 December 2025. Each row is one hour for one storage resource and its QSE, carrying the QSE's submitted energy curve as up to ten monotonic MW/price pairs, the resource's high and low sustainable limits and status, the awarded energy quantity, its settlement point and that point's day-ahead price, and its ancillary awards with the matching market clearing price for capacity in each service (Reg-Up, Reg-Down, RRS-PFR, RRS-FFR, RRS-UFR, ECRS, Non-Spin). This is where day-ahead storage strategy is legible: how a fleet split its capacity between energy and reserves, what it was paid for each, and how its bid curve related to the price that cleared. It is a cleared-market record on a 60-day regulatory delay, not a live feed. Measured 2026-09-07: 3.2 million rows. The official source is ERCOT report NP3-966-ER, 60-Day DAM Disclosure Reports.
DAM Total AS SoldERCOT · hourly (DAM)	This dataset reports the total quantity of ancillary services ERCOT procured in its Day-Ahead Market, broken out by product (such as Regulation Up, Regulation Down, Responsive Reserve, ECRS, and Non-Spinning Reserve) for each delivery hour. These figures show how much reserve capability ERCOT set aside to keep supply and demand balanced and to respond to contingencies, separate from the energy cleared for actual generation. Paired with the per-product clearing prices, the cleared volumes let traders, researchers, and the public see how reserve requirements shift hour to hour and how much of the market's capacity is committed to grid reliability rather than energy. The data comes from ERCOT report NP4-532-CD (DAM Total AS Sold) and updates with each day-ahead market run.