Northern Powergrid



Demand Map Terms

A high level indication of the network capability to connect additional demand is provided within these “Heat Maps” which are updated monthly. We have produced a webinar which provides assistance regarding the use and interpretation of the Northern Powergrid  Availability Maps.

Customer downloadable data which is updated monthly and underpins the Heat Maps is available for download after you tick to accept the “Terms and Conditions” and “Continue” below. 

This workbook contains;

  • A fuller data set than is available on the webview;
  • Heat Map guidance to assist users;
  • A glossary of terms used in the Heat Maps;
  • Statement of Works/Appendix G thresholds;
  • Available Statement of Works/Appendix G headroom; and
  • Specific Customer Requirements (if appropriate).

If you have any further queries please contact us by email

The main assumptions are:

  • The data is provided as an indication and a full design study will be required before any connection offer is made;
  • The data provides information on accepted schemes which are yet to connect to our network as well as any quoted schemes yet to be accepted;
  • Each Primary Substation, Supply Point and the lower voltage side of all Grid Supply Points have been given an overall classification (Red/Amber/Green) based on the known constraints;
  • The constraints shown are based upon the existing network topography, associated demand and generation profiles and accepted demand and generation schemes which are assumed to be operating at maximum capacity (accepted demand schemes have a diversity factor applied dependent upon the specifics of the connection);
  • New demand schemes are still possible at sites with an overall Red or Amber classification; however there may be a requirement for significant network reinforcement which could increase connection costs and timescales;
  • The monthly Availability Map data sheet can be downloaded from the link below the map; and
  • The capacity that a customer is likely to be able to connect without requiring network reinforcement is detailed below, with respect to the Availability Map classifications Red/Amber/Green.

Site                                                     Red                                          Amber                     Green

Primary Substation           No spare capacity               < 2MW                      > 2MW

Supply Point                           No spare capacity              < 2MW                      > 2MW

Grid Supply Point               No spare capacity               < 2MW                     > 2MW


Information last updated May 2020
Legal disclaimer: We have developed the demand availability map to assist you with connections applications in constrained areas. They give a general illustration of demand availability constraints only and cannot be relied upon to assess the terms of connection for specific premises. Nothing in this disclaimer limits or excludes our liability for (a) death or personal injury caused by our negligence; (b) fraud or fraudulent misrepresentation; or (c) any other liability that cannot be limited or excluded by applicable law. Subject to the above, we shall not be liable to you in tort (including negligence) or otherwise, arising under or in connection with your use of the demand availability map for: (a) loss of profits; (b) loss of sales or business; (c) loss of agreements or contracts; (d) loss of anticipated savings; (e) loss of or damage to goodwill; or (g) any indirect or consequential loss.

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Supply points

Use the icons to display areas of high, medium and low availability/demand.

Use the icons to display the specific supply types.

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Click on a supply type to find out related information.

Substation Information
Nominal Voltage (kV): Not sure?
Is the ideal voltage at which the network and the assets are designed to operate. Although for the majority of the times, the "operating voltage" at high voltage is slightly different from the nominal voltage. Northern Powergrid 11 and 20kV networks normally operate at 11.1/11.3kV and 20.1/20.3kV to ensure that our customer voltages are within the statutory voltage limits.
Firm Capacity
Load (MVA):
Maximum / Minimum Load Not sure?
This is the power flow and has been indicated by Maximum (Max)/Minimum (Min) MVA values. The Max value is the maximum demand on the primary substation and the Min value is the minimum demand left on the primary substation after deducting the existing distributed generation. A negative minimum value indicates the existing amount of reverse power flow already flowing through the primary transformers.
Maximum (MVA):
Minimum (MVA):
Accepted Demand
Accepted Demand (Including demand connected at lower voltages):
Transformer Rating (ONAN) Not sure?
The primary transformers normally have two ratings i.e. rating with forced cooling (OFAF) and rating with natural cooling (ONAN). The forced cooled rating is only used in emergency situation for short periods of time. To avoid overstressing the cooling equipment, Northern Powergrid policies dictates that the maximum amount of generation that we can connect on an unconstrained basis is dependant on the naturally cooled transformer rating of a single transformer.
Load (MVA):
Generation (MVA):
Location Data
Postcodes served: