Day Ahead Constraint Flows and Limits
A snapshot of the limits and flows at relevant boundaries at day ahead stage. These flow values are true for when the measurement was taken and will not reflect any changes in the flows following the publication of this data. The network diagrams show the constraint boundaries and arrows indicating the positive direction of power flow across each boundary.
Note: To optimize processing time and file size, data is limited to the past three years plus the current year. e.g., if the current year is 2026, the data file will contain records from 2023 through 2026 inclusive. Should you require access to earlier data, such as from 2019 when storage began, please contact the OpenData team, who will provide it upon request.
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3 Data Files
| Name | Format | Last Changed Sort ascending | Download | Explore |
|---|---|---|---|---|
| Day Ahead Constraint Flows and Limits | CSV | Download (CSV) | view | |
| Network Diagram England & Wales | Download (PDF) | view | ||
| Network Diagram Scotland | Download (PDF) | view |
Additional Information
| Field | Value |
|---|---|
| Creator | National Grid Electricity System Operator |
| Date Created | November 5, 2019 at 9:54 AM (UTC+00:00) |
| Source | National Grid Electricity System Operator |
| Rights | NESO Open Data Licence |
| Update Frequency | Daily (Weekdays) |
cURL integration
# Get a list of dataset's resources
curl -L -s https://api.neso.energy/api/3/action/datapackage_show?id=day-ahead-constraint-flows-and-limits | grep path
# Get resources
curl -L https://api.neso.energy/dataset/cf3cbc92-2d5d-4c2b-bd29-e11a21070b26/resource/38a18ec1-9e40-465d-93fb-301e80fd1352/download/day-ahead-constraints-limits-and-flow-output-v1.5.csv
curl -L https://api.neso.energy/dataset/cf3cbc92-2d5d-4c2b-bd29-e11a21070b26/resource/bb6d6ec6-16d9-4be5-b32c-1a70c09fd871/download/ew-network-diagram-da-limit-boundaries2026.pdf
curl -L https://api.neso.energy/dataset/cf3cbc92-2d5d-4c2b-bd29-e11a21070b26/resource/3eb74046-3ffa-40c3-a541-b3cb00a44b1f/download/scotland-network-diagram-da-limit-boundaries2026.pdf