Mid-Term Solar Forecast

SPP's mid-term solar generation forecast in MW, running roughly seven days ahead with the realized actual carried alongside.

Generation data SPP market

Query with the agent

Native record

event_time x publish_time

Hourly, out ~7 days publication cadence

Evidence

Forecast data

Forward-looking values with an explicit issue time

Time basis

Point-in-time records

UTC · event_time

Overview

Bitemporal, retaining each published vintage against its delivery interval.

Query contract

Preserve one canonical row per (event_time, publish_time) before aggregating.

Analysis rules

Group only after preserving the declared grain: event_time, publish_time.

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.

SPP MCP API reference

HTTP endpoint

POST /api/v1/datasets/spp_solar_forecast_mid_term/query

Schema5

Column

Type

event_timeDateTime64(6, 'UTC')

publish_timeDateTime64(6, 'UTC')

baaLowCardinality(String)

forecast_mwNullable(Float64)

ingested_atDateTime64(6, 'UTC')

Sample data

event_time	publish_time	baa	forecast_mw	ingested_at
2026-09-26 21:00:00.000000	2026-09-19 20:00:00.000000	SWPW	676.98	2026-09-19 20:32:03.419040
2026-09-26 21:00:00.000000	2026-09-19 20:00:00.000000	SPP	1837.78	2026-09-19 20:32:03.419040
2026-09-26 21:00:00.000000	2026-09-19 20:00:00.000000	SWPW	676.98	2026-09-19 20:32:17.829906
2026-09-26 21:00:00.000000	2026-09-19 20:00:00.000000	SPP	1837.78	2026-09-19 20:32:17.829906
2026-09-26 20:00:00.000000	2026-09-19 20:00:00.000000	SWPW	698.85	2026-09-19 20:32:03.419040
2026-09-26 20:00:00.000000	2026-09-19 20:00:00.000000	SPP	1929.2	2026-09-19 20:32:03.419040
2026-09-26 20:00:00.000000	2026-09-19 19:00:00.000000	SWPW	698.85	2026-09-19 20:32:03.419040
2026-09-26 20:00:00.000000	2026-09-19 19:00:00.000000	SPP	1929.2	2026-09-19 20:32:03.419040
2026-09-26 20:00:00.000000	2026-09-19 20:00:00.000000	SWPW	698.85	2026-09-19 20:32:17.829906
2026-09-26 20:00:00.000000	2026-09-19 20:00:00.000000	SPP	1929.2	2026-09-19 20:32:17.829906
2026-09-26 20:00:00.000000	2026-09-19 19:00:00.000000	SWPW	698.85	2026-09-19 20:32:17.829906
2026-09-26 20:00:00.000000	2026-09-19 19:00:00.000000	SPP	1929.2	2026-09-19 20:32:17.829906
2026-09-26 20:00:00.000000	2026-09-19 19:00:00.000000	SWPW	698.85	2026-09-19 19:31:21.325818
2026-09-26 20:00:00.000000	2026-09-19 19:00:00.000000	SPP	1929.2	2026-09-19 19:31:21.325818
2026-09-26 19:00:00.000000	2026-09-19 20:00:00.000000	SWPW	704.23	2026-09-19 20:32:03.419040
2026-09-26 19:00:00.000000	2026-09-19 20:00:00.000000	SPP	1972.53	2026-09-19 20:32:03.419040
2026-09-26 19:00:00.000000	2026-09-19 19:00:00.000000	SWPW	704.23	2026-09-19 20:32:03.419040
2026-09-26 19:00:00.000000	2026-09-19 19:00:00.000000	SPP	1972.53	2026-09-19 20:32:03.419040
2026-09-26 19:00:00.000000	2026-09-19 18:00:00.000000	SWPW	683.55	2026-09-19 20:32:03.419040
2026-09-26 19:00:00.000000	2026-09-19 18:00:00.000000	SPP	1999.68	2026-09-19 20:32:03.419040
2026-09-26 19:00:00.000000	2026-09-19 20:00:00.000000	SWPW	704.23	2026-09-19 20:32:17.829906
2026-09-26 19:00:00.000000	2026-09-19 20:00:00.000000	SPP	1972.53	2026-09-19 20:32:17.829906
2026-09-26 19:00:00.000000	2026-09-19 19:00:00.000000	SWPW	704.23	2026-09-19 20:32:17.829906
2026-09-26 19:00:00.000000	2026-09-19 19:00:00.000000	SPP	1972.53	2026-09-19 20:32:17.829906
2026-09-26 19:00:00.000000	2026-09-19 18:00:00.000000	SWPW	683.55	2026-09-19 20:32:17.829906

Coverage

100.0% complete0 gap days3,357 days with data

Show coverage history

Coverage: 100.0%Days with data: 3,357Gaps: 0

2026

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Related generation data

Related generation data
Dataset	Description
Generation Fuel MixSPP · 5-minute	SPP system generation by fuel, published every five minutes. Unlike markets that publish one row per fuel, SPP publishes one row per interval with a column per fuel: wind, solar, natural gas, coal, nuclear, hydro, diesel, waste, and other, alongside total load and wind's percentage share. Wind is the defining series in this market and regularly supplies a larger share of demand than in any other US market. Solar can read slightly negative overnight, which reflects real station-service draw rather than a data error.
Mid-Term Wind ForecastSPP · Hourly, out ~7 days	SPP's mid-term wind generation forecast in MW, running roughly seven days ahead with the realized actual carried for the same interval. Bitemporal, retaining each published vintage, which makes it suitable for measuring how wind forecast skill degrades with horizon across the Great Plains footprint.
Short-Term Solar ForecastSPP · 5-minute, frequent vintages	SPP's short-term solar generation forecast in MW with the realized solar actual for the same interval. Bitemporal, retaining each successive vintage against its delivery interval. Solar is a much smaller share of the SPP mix than wind and can read slightly negative overnight from station-service draw.
Short-Term Wind ForecastSPP · 5-minute, frequent vintages	SPP's short-term wind generation forecast in MW, carried alongside the realized wind actual for the same interval. Bitemporal, retaining each successive vintage against its delivery interval. Wind is the single most consequential series in SPP, so forecast error here propagates directly into net load, congestion, and price formation.