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For households living close to new electricity transmission infrastructure, the difference between being inside or outside a mapped boundary could soon have a direct financial value.
The government’s forthcoming Bill Discount Scheme is intended to provide eligible households living within 500 metres of certain new or significantly upgraded electricity transmission infrastructure with discounts of up to £250 a year for up to ten years.
The scheme is designed to recognise the role communities will play in hosting the infrastructure needed as Great Britain’s electricity network expands. But behind the relatively simple principle of “within 500 metres” sits a more complex data challenge.
Before a discount can reach a household, the location of the infrastructure needs to be accurately represented, an eligibility zone needs to be created, properties within that zone need to be identified and those properties need to be connected to the correct electricity accounts and suppliers.
In other words, geospatial data will play an important role in turning government policy into something that works at individual household level.
How will the 500-metre eligibility zone work?
Under the current scheme design, eligible households will need to be within 500 metres of qualifying new or significantly upgraded onshore transmission infrastructure.
That could include linear infrastructure, such as overhead transmission lines, as well as non-linear assets such as substations and converter stations.
For new linear infrastructure, the eligibility zone is expected to be measured 500 metres from the edge of the project’s “limit of deviation” — the geographical area established through the planning process within which the infrastructure can be constructed.
For infrastructure such as substations and converter stations, the measurement will instead be taken from the external perimeter of the security fence once construction has started.
Transmission Owners will provide the scheme administrator with geospatial information defining the relevant infrastructure or project boundaries. Ofgem, which has been appointed to administer the scheme, will then be responsible for preparing maps showing the resulting eligibility zones.
This means the quality of the underlying location data has a practical consequence: it helps determine which properties are eligible for a financial benefit and which are not.
From a mapped area to an individual household
Drawing a 500-metre boundary is only the first part of the process.
Once the eligibility zone has been established, the properties within it need to be identified.
The proposed approach uses Unique Property Reference Numbers (UPRNs), which provide unique identifiers for addressable locations. These will help establish which properties fall within each eligibility zone.
That property information then needs to connect with another identifier: the Meter Point Administration Number (MPAN) associated with the property’s electricity supply.
The MPAN allows the eligible household to be linked to its electricity supplier so that, for most households, the discount can be applied automatically to the electricity account.
The result is a chain of information connecting physical infrastructure with geography, properties, electricity supply points and ultimately payments.
Each dataset has a different purpose, but the scheme depends on them working together.
What happens at the boundary?
Any system based on a fixed geographical distance inevitably creates an edge.
A household well within an eligibility zone may be straightforward to identify. Properties close to the 500-metre boundary can be more complicated.
The government has already considered one of the practical issues this creates.
The geographical point associated with a property’s UPRN does not necessarily represent the full physical extent of the property. Relying solely on that point could therefore produce situations where part of a property sits within the eligibility zone but its UPRN location falls outside it.
Under the current design, properties with any part of their physical boundary within the eligibility zone will be considered eligible, provided they meet the scheme’s other requirements.
It is a relatively small technical detail, but an important one. When geographical data is being used to determine an entitlement, how location is represented matters.
Geography also needs a point in time
Location is not the only consideration. Timing matters too.
The government intends eligibility zones to be “timestamped” when main construction work begins, using information supplied by Transmission Owners.
Properties that exist within the eligibility zone at that point can then be assessed for the scheme. Properties built later will generally not become eligible simply because they subsequently appear within the same geographical area.
This adds another dimension to the information-management challenge.
It is no longer enough to know where infrastructure and properties are. The scheme also needs reliable information about when qualifying construction began and which properties existed at that point.
The underlying data therefore needs to represent both place and time.
That combination is important in many areas of infrastructure management. Assets, boundaries and the built environment change, and understanding when information was valid can be just as important as knowing where something is located.
When different datasets need to work together
The proposed scheme provides a useful real-world example of why interoperability matters.
Transmission Owners hold information about infrastructure and project boundaries. Property information provides UPRNs. Electricity industry data connects properties to MPANs and suppliers. Ofgem will administer the eligibility process, while electricity suppliers will deliver most discounts to customers.
None of those datasets exists specifically to deliver this scheme.
Yet the policy depends on information from different organisations and systems being brought together accurately enough to answer what appears to be a simple question:
Is this household eligible?
For the people receiving the discount, the underlying data architecture will largely be invisible. Ideally, it should be.
For the organisations responsible for delivering the scheme, however, data quality, consistent identifiers, accurate geometry, change control and clear ownership of information all become important.
The government has said Transmission Owners will be expected to provide complete, accurate and up-to-date information about eligible infrastructure in a timely manner, reinforcing the importance of reliable data throughout the process.
A practical example of the value of geospatial data
Geospatial information is often associated with maps and visualisation, but its value extends much further.
Location can determine which organisation maintains an asset, where work needs to take place, which infrastructure is affected by an incident, how environmental risks are assessed or whether a property falls within a regulatory boundary.
The Bill Discount Scheme provides another tangible example.
Here, spatial information will help translate a national infrastructure policy into individual household eligibility.
For someone living near new transmission infrastructure, the accuracy of that information could ultimately help determine whether they receive up to £2,500 in electricity bill discounts over ten years.
That is a useful reminder that geospatial data is not simply about showing where things are.
Increasingly, it forms part of the information infrastructure behind real-world operational, regulatory and financial decisions.
What happens next?
Ofgem is currently consulting on how it proposes to administer the Bill Discount Scheme, with the consultation open until 8 September 2026.
The government is also continuing to finalise the policy design ahead of secondary legislation, with the first household payments currently expected in early 2027.
As those arrangements develop, much of the public attention will understandably focus on who receives the discount and how much they will receive.
Behind that process, however, will be a substantial exercise in connecting infrastructure, property and electricity data.
And at the centre of it is a deceptively simple geographical question: what falls within 500 metres?
Further reading: Department for Energy Security and Net Zero, Bill discounts for transmission network infrastructure: scheme design update; Ofgem, Administration of the Bill Discount Scheme.
