gb_npg_heatmap

Northern Powergrid Heat Map Data

Published by Northern Powergrid · GB · Monthly

Grantedcommercial_use_with_attributionHealthy

Thermal generation headroom (MW) and demand headroom (MVA) at Northern Powergrid's 670 GSPs, supply points and primary substations in the North East and Yorkshire, with firm capacity, accepted generation and demand, voltage, fault-level and upstream constraint flags.

What is withheld, and why

Nothing is withheld. Values are served with the attribution the licence asks for: Supported by Northern Powergrid Open Data. Keep it with any figure you show.

NPg's licence (based on OGL v3.0) asks for the statement to be displayed prominently and, where possible, a link to the licence. It excludes personal data and third-party rights; neither is in this dataset.

Licence and rights evidence

Licence: Northern Powergrid Open Data Licence v1.0 (opens the operator’s site)
Attribution: Supported by Northern Powergrid Open Datarequired
Technical access: Yes
Commercial use: Yes
May be cached: Yes
May be redistributed: Yes
Derived data allowed: Yes

Evidence

Exploit the Information commercially and non-commercially for example, by combining it with other Information, or by including it in your own product or application.northernpowergrid.opendatasoft.com/p/opendatalicence/ (opens the operator’s site) · read 25 Sep 2026
Acknowledge Northern Powergrid as the source of the Information by including the following attribution statement “Supported by Northern Powergrid Open Data”northernpowergrid.opendatasoft.com/p/opendatalicence/ (opens the operator’s site) · read 25 Sep 2026
"license": "Northern Powergrid Open Data Licence v1.0"northernpowergrid.opendatasoft.com/api/explore/v2.1/catalog/datasets/… (opens the operator’s site) · read 25 Sep 2026

Methodology

1 version(s)

Northern Powergrid heat-map data: thermal headroom

gb_npg_heatmap_2026 · v2026-07 (data_processed 2026-07-27)

Thermal headroom per site from NPg's heat-map process: generation headroom from firm capacity, the reverse-power-flow factor, minimum net demand and accepted generation downstream (MW); demand headroom from firm capacity, maximum demand and accepted demand downstream (MVA). Upstream constraints can cap a site's headroom, and headroom is not published below zero. Accepted (contracted) generation and demand are netted off; the includes_* flags stay unset because accepted capacity is none of reserved, allocated or pre-reserved. Voltage and fault-level constraints are rated separately (RAG), not netted off.

Capacity basis: operator calculated
Network state: unknown
Binding: No
Additive across assets: No — do not sum these figures
The method accounts for: reserved: not stated · allocated: not stated · pre-reserved: not stated · pending requests: not stated
Comparability class: gb_npg_heatmap
Documentation: Operator’s method (opens the operator’s site)

The operator’s own caveats

NPg's Heat Maps "provide a high level overview of network availability" (dataset description); they are not a connection offer.

How the publication maps to the model

availability types: ["available","contracted","total"]
binding: false
directions: ["injection","offtake"]
firmness: ["firm","unknown"]
geometry precision: exact
includes reserved projects: null
non additive: true
notes: ["Mixed units, as published and never converted: generation headroom (genhr) and accepted generation (gentot) are MW; demand headroom (demhr), accepted demand (demtot) and firm capacity (firm_cap) are MVA (NPg's field unit annotations). An MVA value never satisfies a MW filter.","Headroom is NPg's \"thermal headroom based on the firm capacity\" (generation: with minimum net demand, the reverse-power-flow factor and accepted generation; demand: with maximum demand and accepted demand), hence firm. It is never negative (299 generation and 242 demand zeros today). The site's own arithmetic reproduces it at 350 (generation) and 411 (demand) of 670 sites; elsewhere the published figure is lower, and at 478 of those 506 values the upstream flag (upgenconst / updemconst) names an upstream or GSP constraint.","Accepted generation and demand are the cumulative capacity accepted downstream of the site, served as `contracted`; whether NPg's sums still include accepted plant that has since connected, it does not say.","Voltage and fault-level RAG ratings (genconstraint, demconstraint, e.g. \"Red - Fault Level\"), their worst-case colours, the transmission RAG (gsp_hm_constraint_manual) and the upstream flags qualify the headroom in details; they are not capacity. A Red here is often a fault-level or voltage flag beside ample thermal headroom.","demhr is null at Kielder and Spadeadam 20kV: those rows are counted as rejected, their other values served.","No substation code is published. Assets are keyed by odp_primary_name, NPg's \"name field used for mapping to other portal datasets\", unique on every row and offered as identifier npg_odp_primary_name so NPg's other publications of the same sites (its standard LTDS heatmap) can meet them. 'Supply Point' is NPg's bulk supply point (network level bsp).","Location is NPg's British National Grid easting/northing (EPSG:27700); pvoltage, the only voltage stated, is the transformers' downstream side."]
spatial scope: substation
technologies: ["generic_generation","generic_load"]
units: ["MW","MVA"]

Query this source

$ curl "https://api.gridcapacityapi.com/v1/capacity/search?source=gb_npg_heatmap&limit=20" \  -H "Authorization: Bearer gc_live_..."