Northern Powergrid

Northern Powergrid



Terms and Conditions

The demand availability map provides an indication of the networks capability to connect large-scale developments to Major Substations. The main assumptions are:

  • The data is provided as an indication only.
  • The constraints shown are based on existing connections commissioned on the network and accepted connections assumed to be operating at maximum capacity.
  • The data provides information on accepted but not yet connected schemes, and any valid quoted schemes.
  • Each primary has been given an overall classification based on the known constraints for that area. Connections to the primaries with an overall RED/AMBER classification are still possible, however there might be a requirement for significant network reinforcement to overcome the impact on the network constraints.

Information last updated January 2018. 
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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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: