Getting a New Electricity Supply for Business Premises: The Complete Process

Getting a New Electricity Supply for Business Premises Takes 3–12 Months and Costs Between £5,000 and £150,000. Most Business Owners Don’t Know Either Figure Until It’s Too Late.

A new electricity supply for business premises is one of the most frequently underplanned elements of any commercial property project. Whether you’re fitting out a new build, expanding an existing site, taking on a previously unoccupied property, or adding significant electrical load through EV charging infrastructure or new equipment, the process of establishing or upgrading an electricity supply involves a regulated application to your regional Distribution Network Operator — and neither the timeline nor the cost is trivial.

This guide sets out exactly what is involved, what to expect at each stage, and the decisions that most commonly cause delays and cost overruns.

Do You Need a New Electricity Supply or an Existing One Transferred?

The first distinction to make is whether your premises already has an electricity connection in place:

Existing connection, new occupier: If the premises has been occupied before, there is almost certainly an electricity supply connection in place. The meter, the MPAN (Meter Point Administration Number), and the existing supply infrastructure are all there. What you need is not a new supply — it is a new supply agreement (contract) with an electricity supplier for the existing connection. This is a commercial process managed through an energy broker or directly with suppliers, and can be completed within days. See our Change of Tenancy article for the specific steps.

Existing connection, insufficient capacity: If the premises has an existing supply but your intended operations require more electrical capacity than the current connection provides — because of high-demand manufacturing equipment, EV charging infrastructure, or data centre equipment — you need a connection upgrade. This requires an application to your DNO and is a more involved process than simply switching supplier.

New build, no existing connection: A new electricity supply connection from scratch. The most time-consuming and potentially expensive scenario. Full DNO application, design, civil works, and commissioning required.

The DNO Application Process: Stage by Stage

Distribution Network Operators (DNOs) are the regional network companies responsible for the electricity infrastructure between the national transmission system and your premises. There are 14 licensed DNOs in the UK, organised under six ownership groups: UK Power Networks (London, South East, East Anglia), National Grid Electricity Distribution (formerly Western Power Distribution — South West, South Wales, Midlands, East Midlands), Northern Powergrid (North East, Yorkshire), Electricity North West, SP Energy Networks (ScottishPower Manweb in North Wales and Merseyside, and SP Distribution in Scotland), and SSEN (Scottish and Southern Electricity Networks).

The connection application process typically follows these stages:

Stage 1 — Pre-application enquiry (optional but recommended): Before submitting a formal application, a pre-application enquiry to the DNO allows you to receive indicative connection costs and timelines without committing to the formal process. For larger or more complex connections, this step can save significant time by identifying constraints — network capacity limitations, reinforcement requirements — before you invest in detailed design work.

Stage 2 — Formal connection application: Submit the formal application including: the site address, the type of supply required (single-phase or three-phase), the requested maximum demand (in kVA), the load profile (when demand will peak), and in many cases a completed load schedule from your electrical engineer. The DNO is required to provide a formal quotation within 65 working days of accepting a complete application.

Stage 3 — Connection quotation: The DNO designs the connection and provides a formal quotation showing connection cost, design specification, and proposed timeline. The quotation is valid for a defined period (typically 90 days). You can accept, negotiate, or reject. Multiple connections — the right to obtain connection quotes from alternative providers under the contestable works regime — is available for some elements of the work and can reduce costs through competition.

Stage 4 — Acceptance and design: On accepting the quotation, a design confirmation process begins. This typically includes agreeing the connection point, cable route, substation requirements (if required), and metering arrangements. For larger connections, a formal design package is produced by the DNO’s engineers.

Stage 5 — Civil works and installation: The DNO or an approved contractor installs the connection infrastructure — laying cables, installing switchgear, and constructing any required substation. This is the physically time-consuming element and is particularly extended if road or footpath crossings, third-party land permissions, or significant excavation is involved.

Stage 6 — Metering and commissioning: Advanced meters are installed, the connection is energised, and the supply is commissioned. At this point, the MPAN is registered and a supply agreement with an electricity supplier can be established.

Realistic Timelines

The most common source of frustration in new electricity supply projects is the gap between expected and actual timelines. Realistic expectations:

• Simple connection upgrade (no reinforcement, straightforward cable route): 3–6 months from application to energisation
• New connection requiring substation: 6–12 months
• Connection requiring network reinforcement: 12–24 months — reinforcement works require DNO planning, procurement, and construction that are largely outside the control of the applicant
• Connection in constrained urban areas: Additional delays from planning permission, traffic management requirements, and third-party approvals

These timelines must be factored into your project programme. A business planning to open new premises in six months that needs a new electricity connection should be making the DNO application now — not after the building work is complete.

Understanding Your Connection Quotation

DNO connection quotations contain several cost components:

Non-contestable works: Work that only the DNO can carry out — energisation, protection equipment, metering infrastructure. Typically a fixed cost element.

Contestable works: Civil works and cable installation that can be carried out by a DNO-approved Independent Connection Provider (ICP) rather than the DNO itself. Obtaining competing quotes from ICPs for contestable works can reduce connection costs by 15–30% versus accepting the DNO’s quoted price for the full scope.

Reinforcement contribution: If your connection requires network reinforcement — upgrading the local distribution network to accommodate your additional load — you may be required to contribute to the reinforcement cost. For very large connections in areas of network constraint, this contribution can be the dominant cost item.

Ongoing capacity charge: After connection, an annual capacity charge based on your agreed supply level (kVA) is included in your electricity bills as part of the network charges. This is not a one-off cost — it is a permanent element of your electricity overhead. Correctly sizing your connection reduces this ongoing charge.

What Determines Your Maximum Demand Requirement

The maximum demand (kVA) you request in your connection application determines both the connection design and your ongoing capacity charges. It should reflect:

• Your maximum simultaneous electrical load across all equipment and systems
• Growth plans for the next 5–10 years (EV charging expansion, production growth, HVAC upgrades)
• Any diversity factor applied by your electrical engineer (not all loads run simultaneously at full power)

An electrical engineer’s load schedule, produced before the DNO application, is the correct basis for this specification. Don’t guess — the consequences of under-specifying are an expensive upgrade application and months of delay when you need to expand.

Once Connected: Arranging the Supply Contract

The DNO provides the connection infrastructure. The electricity supply — the actual commodity — is a separate commercial relationship with an electricity supplier of your choice. Once the MPAN is registered, you can approach the market for supply contracts.

For new connections, the first contract is a fresh start — no auto-renewal trap to worry about, no incumbent to notify. Approach the market competitively from day one and set up a renewal tracking process to ensure you never slip into out-of-contract rates.

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