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Overview

How much generation capacity ERCOT's Reliability Unit Commitment (RUC) process has effectively forced online, hour by hour. For each hour of the RUC study period, ERCOT publishes the sum of the High Sustained Limits (HSLs) of resources that are online in the most recent SCED execution but were indicated as offline in their Current Operating Plan (COP) — i.e. capacity RUC committed beyond what the market self-committed. This is a direct hourly proxy for RUC-committed MW, the signal behind reliability commitments on tight days. From 2021 the megawatts are broken out by weather zone (South, North, West, Houston) with committed_capacity_mw as the system total; earlier vintages (back to October 2018) carry the system-wide total only, since ERCOT did not publish the zonal split before then. It is bitemporal — every row carries both the study delivery hour (event_time) and the publishing vintage (source_time), so successive hourly RUC runs accumulate as distinct rows. The official source is ERCOT report NP3-764-CD, Hourly RUC Online In SCED Offline In COP.

Use with MCP

This table is available through the signed-in, read-only Ask the Grid MCP server. Connect a market below, then use search_data or describe_data to load its query contract before calling query_data.

ERCOT MCP

Schema13

Column
Type
event_timeDateTime64(6, 'UTC')
source_timeDateTime64(6, 'UTC')
ruc_timestampNullable(DateTime64(6, 'UTC'))
sced_timestampNullable(DateTime64(6, 'UTC'))
committed_capacity_mwNullable(Float64)
committed_capacity_mw_southNullable(Float64)
committed_capacity_mw_northNullable(Float64)
committed_capacity_mw_westNullable(Float64)
committed_capacity_mw_houstonNullable(Float64)
dst_flagNullable(Bool)
emil_idNullable(String)
doc_idNullable(Int64)
ingested_atDateTime64(6, 'UTC')

Sample rows

event_timesource_timeruc_timestampsced_timestampcommitted_capacity_mwcommitted_capacity_mw_southcommitted_capacity_mw_northcommitted_capacity_mw_westcommitted_capacity_mw_houstondst_flagemil_iddoc_idingested_at
2026-08-15 06:00:00.0000002026-08-15 05:29:44.0000002026-08-15 05:03:03.0000002026-08-15 05:05:17.0000003.9003.90falseNP3-764-CD12624532422026-08-15 05:36:02.427357
2026-08-15 05:00:00.0000002026-08-15 04:26:57.0000002026-08-15 04:03:03.0000002026-08-15 04:05:18.000000228.900228.90falseNP3-764-CD12624385802026-08-15 05:36:02.427357
2026-08-15 04:00:00.0000002026-08-15 03:27:11.0000002026-08-15 03:03:03.0000002026-08-15 03:05:19.000000715.403720343.4falseNP3-764-CD12624239992026-08-15 05:36:02.427357
2026-08-15 03:00:00.0000002026-08-15 02:28:54.0000002026-08-15 02:03:03.0000002026-08-15 02:05:19.0000001257.551.44350771.1falseNP3-764-CD12624079862026-08-15 05:36:02.427357
2026-08-15 02:00:00.0000002026-08-15 01:26:19.0000002026-08-15 01:03:03.0000002026-08-15 01:05:20.000000950.8000000000001141.600809.2falseNP3-764-CD12623925102026-08-15 04:36:03.244504
2026-08-15 01:00:00.0000002026-08-15 00:30:10.0000002026-08-15 00:03:04.0000002026-08-15 00:05:20.0000001254.5141.44350678.1falseNP3-764-CD12623780022026-08-15 03:36:01.370934
2026-08-15 00:00:00.0000002026-08-14 23:29:17.0000002026-08-14 23:03:03.0000002026-08-14 23:05:22.000000885.116500720.1falseNP3-764-CD12623624352026-08-15 02:36:08.963539
2026-08-14 23:00:00.0000002026-08-14 22:32:41.0000002026-08-14 22:03:03.0000002026-08-14 22:05:22.0000001073.41350260678.4falseNP3-764-CD12623451112026-08-15 01:36:03.805066
2026-08-14 22:00:00.0000002026-08-14 21:33:43.0000002026-08-14 21:03:03.0000002026-08-14 21:05:20.0000001368.85640129675.8falseNP3-764-CD12623326072026-08-15 00:36:13.481973
2026-08-14 21:00:00.0000002026-08-14 20:16:11.0000002026-08-14 20:03:03.0000002026-08-14 20:05:20.0000007639000673falseNP3-764-CD12623136172026-08-14 23:36:26.059665
2026-08-14 20:00:00.0000002026-08-14 19:17:43.0000002026-08-14 19:03:03.0000002026-08-14 19:05:22.000000890.4111107.60671.8falseNP3-764-CD12622974682026-08-14 22:36:02.691817
2026-08-14 19:00:00.0000002026-08-14 18:21:06.0000002026-08-14 18:03:03.0000002026-08-14 18:05:24.0000001463.490413171789.4falseNP3-764-CD12622793952026-08-14 21:36:12.111221
2026-08-14 18:00:00.0000002026-08-14 17:23:28.0000002026-08-14 17:03:03.0000002026-08-14 17:05:24.000000108001080falseNP3-764-CD12622647162026-08-14 20:36:02.833037
2026-08-14 17:00:00.0000002026-08-14 16:22:46.0000002026-08-14 16:03:04.0000002026-08-14 16:05:23.00000066605571090falseNP3-764-CD12622494742026-08-14 19:36:03.303632
2026-08-14 16:00:00.0000002026-08-14 15:24:49.0000002026-08-14 15:03:04.0000002026-08-14 15:05:18.000000557.12310109217.1falseNP3-764-CD12622344392026-08-14 18:36:01.777725
2026-08-14 15:00:00.0000002026-08-14 14:21:17.0000002026-08-14 14:03:03.0000002026-08-14 14:05:17.000000738.22980110330.2falseNP3-764-CD12622118472026-08-14 17:36:01.352359
2026-08-14 14:00:00.0000002026-08-14 13:17:36.0000002026-08-14 13:03:03.0000002026-08-14 13:05:17.000000111001110falseNP3-764-CD12621902752026-08-14 16:36:01.959798
2026-08-14 13:00:00.0000002026-08-14 12:17:38.0000002026-08-14 12:03:03.0000002026-08-14 12:05:17.000000111001110falseNP3-764-CD12621729182026-08-14 15:36:02.797097
2026-08-14 12:00:00.0000002026-08-14 11:17:47.0000002026-08-14 11:03:03.0000002026-08-14 11:05:16.00000000000falseNP3-764-CD12621577122026-08-14 14:36:03.145437
2026-08-14 11:00:00.0000002026-08-14 10:17:48.0000002026-08-14 10:03:03.0000002026-08-14 10:05:17.00000000000falseNP3-764-CD12621400052026-08-14 13:36:01.191413
2026-08-14 10:00:00.0000002026-08-14 09:19:54.0000002026-08-14 09:03:03.0000002026-08-14 09:05:16.00000000000falseNP3-764-CD12621220062026-08-14 12:36:01.837840
2026-08-14 09:00:00.0000002026-08-14 08:16:59.0000002026-08-14 08:03:04.0000002026-08-14 08:05:15.00000000000falseNP3-764-CD12621070322026-08-14 11:36:02.744395
2026-08-14 08:00:00.0000002026-08-14 07:16:44.0000002026-08-14 07:03:03.0000002026-08-14 07:05:19.000000217002170falseNP3-764-CD12620922622026-08-14 10:36:02.683568
2026-08-14 07:00:00.0000002026-08-14 06:18:23.0000002026-08-14 06:03:03.0000002026-08-14 06:05:19.000000218002180falseNP3-764-CD12620776052026-08-14 09:36:01.889903
2026-08-14 06:00:00.0000002026-08-14 05:19:39.0000002026-08-14 05:03:03.0000002026-08-14 05:05:19.000000729.6999999999999587.800141.9falseNP3-764-CD12620624832026-08-14 08:36:03.819027

Coverage

100.0% complete0 gap days2,852 days with data
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Coverage: 100.0%Days with data: 2,852Gaps: 0
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