BPA Total Transmission System Load

BPA Total Transmission System Load every hour since 2007: generation in the balancing area plus interchange and wheeling onto the system, the measure BPA bills monthly transmission peaks on.

BPALoad data BPA market

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One row per: feed x hour; Hourly cadence
Evidence: Observed market data; Published observations from the named source
Time basis: Point-in-time records; UTC · event_time

Overview

Query contract: Preserve one canonical row per (feed, event_time) before aggregating.
Analysis rules: Use by_hour for history and current_month for hours it does not yet hold.
Interpretation: TTSL is not a regulatory system-load measure.

Access

Download: Query it in SQL, download it, or read it with an API key. Download data
MCP: Connect an MCP client and load the contract with describe_data before calling query_data.BPA MCP API reference
HTTP endpoint: POST /api/v1/datasets/bpa_ttsl_hourly/query
Full history: Delivered to Snowflake, Databricks or your own storage on a schedule by Data services.
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Schema

7 columns

Column	Type
`event_time`	`DateTime64(6, 'UTC')`
`feed`	`LowCardinality(String)`
`load_date`	`Date32`
`hour_ending`	`Int32`
`ttsl_mw`	`Nullable(Float64)`
`source_file`	`String`
`ingested_at`	`DateTime64(6, 'UTC')`

Sample data

event_time	feed	load_date	hour_ending	ttsl_mw	source_file	ingested_at
2026-11-02 07:00:00.000000	current_month	2026-11-01	24	16617	daily.xls	2026-11-02 18:54:31.826376
2026-11-02 06:00:00.000000	current_month	2026-11-01	23	17393	daily.xls	2026-11-02 18:54:31.826376
2026-11-02 05:00:00.000000	current_month	2026-11-01	22	18189	daily.xls	2026-11-02 18:54:31.826376
2026-11-02 04:00:00.000000	current_month	2026-11-01	21	18877	daily.xls	2026-11-02 18:54:31.826376
2026-11-02 03:00:00.000000	current_month	2026-11-01	20	19266	daily.xls	2026-11-02 18:54:31.826376
2026-11-02 02:00:00.000000	current_month	2026-11-01	19	19438	daily.xls	2026-11-02 18:54:31.826376
2026-11-02 01:00:00.000000	current_month	2026-11-01	18	19379	daily.xls	2026-11-02 18:54:31.826376
2026-11-02 00:00:00.000000	current_month	2026-11-01	17	18733	daily.xls	2026-11-02 18:54:31.826376
2026-11-01 23:00:00.000000	current_month	2026-11-01	16	19008	daily.xls	2026-11-02 18:54:31.826376
2026-11-01 22:00:00.000000	current_month	2026-11-01	15	19122	daily.xls	2026-11-02 18:54:31.826376
2026-11-01 21:00:00.000000	current_month	2026-11-01	14	19611	daily.xls	2026-11-02 18:54:31.826376
2026-11-01 20:00:00.000000	current_month	2026-11-01	13	19804	daily.xls	2026-11-02 18:54:31.826376
2026-11-01 19:00:00.000000	current_month	2026-11-01	12	19906	daily.xls	2026-11-02 18:54:31.826376
2026-11-01 18:00:00.000000	current_month	2026-11-01	11	20345	daily.xls	2026-11-02 18:54:31.826376
2026-11-01 17:00:00.000000	current_month	2026-11-01	10	20293	daily.xls	2026-11-02 18:54:31.826376
2026-11-01 16:00:00.000000	current_month	2026-11-01	9	19854	daily.xls	2026-11-02 18:54:31.826376
2026-11-01 15:00:00.000000	current_month	2026-11-01	8	18735	daily.xls	2026-11-02 18:54:31.826376
2026-11-01 14:00:00.000000	current_month	2026-11-01	7	17269	daily.xls	2026-11-02 18:54:31.826376
2026-11-01 13:00:00.000000	current_month	2026-11-01	6	16315	daily.xls	2026-11-02 18:54:31.826376
2026-11-01 12:00:00.000000	current_month	2026-11-01	5	15865	daily.xls	2026-11-02 18:54:31.826376
2026-11-01 11:00:00.000000	current_month	2026-11-01	4	15442	daily.xls	2026-11-02 18:54:31.826376
2026-11-01 10:00:00.000000	current_month	2026-11-01	3	15599	daily.xls	2026-11-02 18:54:31.826376
2026-11-01 09:00:00.000000	current_month	2026-11-01	2	15639	daily.xls	2026-11-02 18:54:31.826376
2026-11-01 08:00:00.000000	current_month	2026-11-01	2	15709	daily.xls	2026-11-02 18:54:31.826376
2026-11-01 07:00:00.000000	current_month	2026-11-01	1	15710	daily.xls	2026-11-02 18:54:31.826376

Coverage

Complete: 100.0%
Gap days: 0
Days with data: 7,246

Show coverage history

Coverage: 100.0%Days with data: 7,246Gaps: 0

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Related data

Related load data
Dataset	Description
BPA FERC 714 Hourly LoadBPA · hourly	Hourly BPA load from Part III Schedule 2(a) of its FERC Form 714 filings, 1998 onward, long by series as printed (system load, area load, balancing authority area load).
BPA Tri-Cities MonitoringBPA · 5-minute	BPA's Tri-Cities area monitoring charts: area load, import and generation (MW), Hanford bus frequency (Hz), Ashe (230 kV), Benton (115 kV), and Grandview and Horse Heaven (115 kV) bus voltages; the GRAN_HORS_KV series labels omit units but readings are kV. Seven days rolling from BPA; history accrues from collection.
7-Day Load ForecastPJM · hourly (7-day horizon)	PJM's seven-day-ahead hourly load forecast by forecast area, refreshed through the day. Rows are keyed by target time (event_time) with the issue time in evaluated_at_utc; take the latest vintage per target hour via an argMax over evaluated_at_utc. Forecast areas match the very-short-term feed (utility names, RTO_COMBINED for the system total). This is the table for tomorrow's peak and the week-ahead demand outlook. Source: PJM Market Data.
Actual Demand by RegionMISO · hourly	Observed hourly MISO demand in MW for the Central, North, and South sub-regions. Region labels are normalized to uppercase; this is regional operational load, not a local-resource-zone series.