A DNO is a licensed organisation responsible for maintaining the local electricity network. They ensure your site can safely be connected or upgraded when its electricity use changes.
Frequently asked questions for Distribution Network Operators
This FAQ is organised by topic for quick reference from technical checks to timelines, forms, and costs.
While this FAQ is scheme-neutral, references to specific schemes (e.g. PSDS Phase 3c) are included where necessary for delivery clarity.
Understanding the basics
Projects that increase or alter electrical demand, such as heat pumps, EV chargers, solar PV, or battery storage, can impact voltage quality and local grid capacity. Early notification allows the DNO to assess and respond accordingly.
An estimate is a rough cost indication. A quotation is a formal offer from the DNO and becomes binding once accepted and paid.
Site information and capacity
An MPAN (Meter Point Administration Number) is a unique reference for your electricity connection. Delays in allocation can occur if the site has no established address or the meter hasn’t been energised. In these cases, a temporary MPAN may be issued.
Yes. The DNO may offer guidance based on your MPAN, and some may provide site surveys. This helps where smart meters or data loggers aren’t available.
Yes, in some cases, a temporary MPAN can be issued for planning purposes. This is useful when the permanent supply point hasn't yet been registered.
You will need your site’s MPAN, meter serial number, address, current and proposed electrical load (in kW or kVA), a site plan showing the meter location, and a letter of authority (if you’re not the building owner).
Check your electricity bill for the “assigned capacity,” or contact your electricity supplier or DNO using your MPAN.
Your electricity supplier or the DNO may be able to help. Some DNOs offer site visits or surveys, though charges may apply.
Yes. Reducing your agreed capacity can lower standing charges. Speak with your DNO to explore this.
Forms, process and submissions
Use the DNO’s online portal to submit a “Change existing supply” or “New connection” request. Include accurate contact details and reference any funding scheme (e.g. PSDS Phase 3c).
You should receive a confirmation within 48 hours. The DNO will respond with either an “Ok to connect” or a “Connection offer” requiring further works and a quote.
Yes. You can accept only the non-contestable elements from the DNO and manage the rest separately, which may result in a revised quote.
Costs and budget planning
Yes, in England (e.g. PSDS). Always check scheme guidance to confirm eligibility.
Some do, depending on project size and region. Charges are often waived below certain thresholds.
Yes. You’re entitled to a breakdown of contestable (optional) vs non-contestable (fixed) works.
Timelines and delays
Simple upgrades may take weeks. Larger or high-voltage works could take several months. Always build in time for DNO-related activity.
Yes, if discussed early. Your DNO may agree to deliver works in stages.
DNOs may allow grouped submissions for estates or batches of buildings. Always confirm with them first.
Follow up with your DNO's contact centre. If you still receive no response, escalate via their customer service route or consult your delivery team lead for support.
Technical and connection requirements
Yes, even if you're only removing equipment, such as gas boilers, the DNO needs to know. A change in load (increase or decrease) can affect the local network.
Yes. Even if you’ve paid for a higher NPR, you must still engage with the DNO to confirm the capacity is available and the network can support your changes.
If your main fuse rating is higher than your cable’s capacity, the DNO may refuse to energise the supply or may recommend fuse downgrading. Always check cable ratings as part of your load assessment.
Costs vary by site and technology. For small-scale PV (up to 30kW), typical upgrade costs might range from £3,000–£10,000, depending on network reinforcement needs.
Check your DNO’s website. Many offer online capacity maps and hold regular PACE or ‘surgery’ sessions where you can ask about upcoming projects, capacity, and expected timescales.
For further guidance, refer to the main DNO delivery toolkit. For scheme-specific questions, contact your programme’s delivery support team or refer to the relevant scheme guidance.
