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gb_enwl_heatmap_tool

ENWL Heatmap Tool

Published by SP Electricity North West / GB / When the operator updates it

Grantedcommercial_use_with_attributionDegraded

Firm and N-0 demand headroom, N-0 generation headroom by generator type and battery headroom (MW) at every ENWL primary substation and BSP, with the Appendix G transmission position of each GSP.

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ENWL Heatmap Tool on a map

The 436 located assets in this publication, coloured by the spare capacity SP Electricity North West publishes for each today. Click a point for its figure.

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What is withheld, and why

Nothing is withheld. Values are served with the attribution the licence asks for: SP Electricity North West, Heatmap Tool (CC BY 4.0). Keep it with any figure you show.

The conflict between the website terms and the CC BY 4.0 label on ENWL's portal datasets was put to ENWL (dataportal@enwl.co.uk) on 2026-09-26. ENWL's Open & Shared Data Manager answered in writing on 2026-09-29 that any dataset classified Open may be adapted and shared under CC BY 4.0 with ENWL credited as the source, by API or export. The heat map figures are published on the portal as datasets classified Open under CC BY 4.0 (gb_enwl_heatmaps, login-only to fetch), and this workbook carries the same figures; switched to commercial_use_with_attribution on 2026-10-02 on that confirmation. Credit ENWL with every figure. An objection from ENWL means rights_override = blocked the same day.

Licence and rights evidence

Licence
CC BY 4.0 (opens the operator’s site)
Attribution
SP Electricity North West, Heatmap Tool (CC BY 4.0)required
Technical access
Yes
Commercial use
Yes
May be cached
Yes
May be redistributed
Yes
Derived data allowed
Yes

Evidence

Methodology

2 version(s)

ENWL Heatmap Tool: primary and BSP headroom

gb_enwl_heatmap_tool_2026 · v2026-08

Spare capacity estimated by a high-level assessment of thermal loading of circuits and transformers, fault level and voltage step change, per connection type; primary figures take account of constraints at the associated BSP.

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_enwl_heatmap
Documentation
Operator’s method (opens the operator’s site)

The operator’s own caveats

  • Please note that the data presented in this tool is based on high level analysis and as such may differ from the results of a formal connection application.
  • The values of spare capacity quoted by the Heatmap Tool are based on total capacity available to connections not the maximum size of an individual connection
  • These include 132 kV network constraints and the effect of meshed networks

ENWL Heatmap Tool: Appendix G summary

gb_enwl_heatmap_tool_appendix_g_2026 · v2026-08

The Appendix G return per converted GSP: connected and contracted power stations in Parts 1 to 4, the materiality headroom NESO determines at the transmission interface (Part 5), capacity in project progression, and the aggregated developer capacity limit.

Capacity basis
operator published
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_enwl_appendix_g
Documentation
Operator’s method (opens the operator’s site)

The operator’s own caveats

  • Note that the capacities reported in the table above were true prior to the ongoing Connections Reform, hence only indicative.

How the publication maps to the model

availability types
["available","connected","contracted","requested","total","unknown"]
binding
false
directions
["offtake","injection","bidirectional"]
firmness
["firm","conditional","unknown"]
geometry precision
exact
includes reserved projects
null
non additive
true
notes
["Firmness from ENWL's user guide: Demand Firm is \"secure for the loss of a single circuit\"; every other figure is \"based on a N-0 connection i.e. a connection that is constrained off for the loss of the first circuit\" and is conditional.","Inverter-based generation \"includes photo-voltaic sites and many types of wind generator\": generic_generation with variant inverter_based; synchronous LV and HV are variants too. Battery storage (MIC = MEC) is one bidirectional value.","Primary and BSP locations are British National Grid easting/northing (EPSG:27700), as published.","Appendix G (sheet 7) is a separate methodology. Parts 2 and 3 (\"connected or contracted to connect\") have no single availability type and are unknown; Part 1 connected, Part 4 contracted, Part 5 materiality headroom available, project progression requested, the aggregated developer capacity limit total.","Transmission fault-level headroom is in kA, which the unit vocabulary does not carry; it is kept as an attribute, with \"TBC\" as written.","Sheet 6 (GSP Demand Headroom) is hidden in the workbook and pairs Firm/Non Firm with non-inverter/inverter labels the guide does not define; it is not read. Unlabelled columns (E, Q, R, S on sheet 4) are kept in the provenance record by their column letter and mapped to nothing.","No substation codes are published in the workbook; primary, BSP and GSP names are the identities."]
spatial scope
substation
technologies
["generic_load","generic_generation","battery"]
units
["MW"]

Query this source

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