Concepts

Data Freshness

How often data updates and how far back it reaches
View as Markdown

Historical data availability

Forecasts

Historical forecasts available back to January 1, 2026 via the forecasted_by parameter. Applies to both standard forecast and continuous endpoints.

Backcasts

Day-ahead backcasted forecasts available from January 1, 2023 onward.

Actuals

Historical observed data available from January 1, 2022 onward via the /region/{iso}/{metric}/actual endpoint.

Data update cadence

Data typeUpdate frequencyNotes
RegionsAs neededISOs may add, modify, or remove regions over time. ISOview keeps definitions current.
PlantsMonthlyCapacity, coordinates, operational status, and county assignment.
Gas historyEnterprise onlyHistorical natural gas price data requires an enterprise membership.

For bulk historical data access or natural gas history, inquire about our enterprise membership which includes priority support.