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Network capacity map

The network capacity map provides an indication of the networks capability to connect large-scale developments to major substations. The colour gradings are intended to guide the user to areas of the network where a connection is more likely to be achieved without significant reinforcement.

The map also displays National Grid Transmission's (NGT) Statement of Works responses applicable to each site which may further restrict connection availability. More information on the Statement of Works and responses from NGT can be found here on our Statement of Works webpage.

Main points to note regarding the map are: 

  • The data is provided as an indication only and is not intended to be relied upon. Data is taken from the six monthly updated WPD Long Term Development Statement (LTDS) and supplemented with regularly updated quotation statistics;
  • Generation headroom is calculated using up-to-date quotation statistics incorporating connected generation, accepted but not yet connected generation and quoted generation figures. These figures will regularly change as quotations are issued and expire. Currently the map cannot differentiate between multiple offers for the same site inflating the overall connected generation figure and suggesting negative headroom in some instances;
  • Generation headroom is calculated using reverse power capabilities of each site. Where this figure was missing in the LTDS an assumed value of 50% of firm capacity has been used; 
  • Connections to the substations with an overall RED classification are still possible, however there might be a requirement for significant network reinforcement to overcome the impact on the network constraints. 

The map does not replace a full formal application in determining network capacity.

Please click here and choose 'Request Access' to register for access to our downloadable capacity map data or here if you're already registered.

Would you like help finding the right network data?

What would you like to connect?

What kind of demand would you like to connect?

What kind of generation would you like to connect?

What are you connecting?

What are you connecting?

Small scale at domestic premises

The capacity map is designed for guidance for larger connections and is not appropriate for a single domestic installation. Please click link below to go to our pages on installing small scale generation.

G83 Single premises connection procedure

Do you know where you would like to connect?

Where would you want to connect?

You can find a location using a postcode


Select a Western Power Distribution area



We have developed the network capacity map to assist you with connections applications in constrained areas. The map gives a general illustration of availability constraints only and cannot be relied upon to assess the terms of connection for specific premises. Whilst we use reasonable endeavours to ensure that the network capacity map and related information is accurate, we do not warrant, and do not accept any responsibility or liability for, the accuracy or completeness of the content or for any loss which may arise from reliance on the network capacity map or related information. The terms and conditions for use of our website apply to the network capacity map and related information.

Network capacity map

Filter by


Capacity Search

Filters sites by capacity available according to which ‘Capacity Mode’ is selected. i.e. A 5MVA search when in capacity mode ‘Both’ will return sites with 5MVA of both demand and generation capacity available. Sites returned may still be affected by other constraints.

Substation Demand Headroom

Capacity available for import at that site

Substation Reverse Power Headroom

Capacity available for export at that site

Upstream Generation and Demand Headroom

Availability at sites upstream from the substation selected. Any upstream constraints affect downstream so that the status of these sites are pulled up to the lowest availability rating in the hierarchy

Substation Fault Level Headroom

Remaining fault level capacity at the site

Associated Statement of Works

Indicates if there is a Statement of Works response associated with the site, further details can be found in the ‘More Information’ section

More Information

Contains further details on the substation including equipment ratings and generation details

Name Type Demand Headroom Reverse Power Headroom Latitude Longitude
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Further Information

Substation Information




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Fault Levels

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Statement of Works



New Connections: Generation






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