Electricity disconnection is a fundamental part of demolition, redevelopment, and site clearance projects. Unlike gas disconnection, which has a single well-defined safety risk, electricity disconnection has several moving parts: the meter, the supply point, and sometimes network-owned equipment within the property. Getting the right disconnection type at the right time is essential for project progress and safety.
This guide covers how electricity disconnection works in the UK.
Three Types of Electricity Disconnection
There are three main types.
One. Meter removal only. The supplier removes the meter but the supply cable and associated equipment remain in place. Suitable for temporary disconnection.
Two. Service disconnection (also called “cut and terminate”). The DNO or IDNO physically cuts and terminates the supply cable at a safe point, isolating the property from the network. This is required for demolition.
Three. Substation decommissioning. For large sites with a customer substation, the substation may need decommissioning or repositioning. This is a major piece of work.
Demolition projects need at least a service disconnection, not just a meter removal.
Who Does What
Different parties are involved depending on the type of work.
The energy supplier (British Gas, E.ON, Octopus, etc) owns the meter and handles meter-only removals.
The Distribution Network Operator (DNO) or Independent DNO (IDNO) owns the network and handles service disconnections and substation works. The seven UK DNOs are UK Power Networks, Western Power Distribution (National Grid ED), SSEN, Northern Powergrid, Electricity North West, SP Energy Networks, and NIE (Northern Ireland).
Independent Connection Providers (ICPs) can also carry out disconnection works on behalf of DNOs or IDNOs. See our guide to the ICP role for more background.
For a customer, this means:
Meter removal only: contact the supplier.
Service disconnection: contact the DNO or IDNO (or an ICP).
Substation work: contact the DNO or IDNO, usually with specialist engineering input.
The Process for Service Disconnection
A typical service disconnection runs:
Step one: Identify the DNO or IDNO responsible for the supply. This can be confirmed through the MPAN (Meter Point Administration Number) or by checking the ENA (Energy Networks Association) database.
Step two: Submit a disconnection application to the DNO. Each DNO has its own forms and portal.
Step three: Site survey. The DNO or ICP surveys the connection to plan the disconnection.
Step four: Quote. The cost and timescale are provided.
Step five: Acceptance and payment. The customer accepts the quote and pays the connection charge.
Step six: Scheduled works. The disconnection is carried out, usually requiring a planned outage and sometimes traffic management.
Step seven: Certification. A disconnection certificate confirms safe isolation.
Typical Costs
Disconnection costs vary by complexity.
Residential single-phase service disconnection: £800 to £2,000.
Commercial single-phase disconnection: £1,000 to £3,500.
Commercial three-phase disconnection: £1,500 to £5,000.
Industrial or HV supply disconnection: £3,500 to £15,000+.
Substation decommissioning: £25,000 to £100,000+.
Additional costs can include:
Excavation and reinstatement.
Traffic management.
Out-of-hours or weekend working.
Network reconfiguration if neighbouring properties are affected.
Timescales
Electricity disconnection timescales:
Application to quote: 4-8 weeks.
Quote acceptance to scheduled date: 6-12 weeks.
Total: 10-20 weeks for most disconnections.
For HV or substation work, timescales can extend to 6-9 months because of the complexity of network reconfiguration.
Documents Required
For a disconnection application, typical requirements:
Site address and MPAN.
Proof of ownership or authorisation.
Final meter reading.
Demolition or redevelopment programme (for demolition disconnections).
Asbestos survey if applicable.
Access arrangements.
Planning permission documents if applicable.
Safety Considerations
Several safety considerations apply.
Lockout/tagout. The isolated supply must be physically locked and tagged to prevent accidental re-energisation.
Verification. Electrical dead-testing must confirm isolation before any demolition work near the supply.
Cable awareness. Buried cables may remain in the ground after service disconnection. CAT and Genny surveying before excavation is essential.
Hazardous old equipment. Older installations may include equipment containing asbestos, PCBs, or mercury. Specialist disposal is required.
Interaction with Other Utilities
Electricity disconnection typically runs in parallel with gas and water disconnection, often as part of a wider utility disconnections package ahead of demolition. Typical sequence:
Arrange all utility disconnections together.
Schedule them to coincide with demolition start date.
Confirm each disconnection certificate before demolition proceeds.
Complete utility reinstatement plan for redevelopment.
Substation Decommissioning
Sites with customer substations require specific attention.
Customer-owned substations on the customer side of the supply boundary. Simpler to decommission.
DNO-owned substations inside or on the customer’s property. Often more complex because the DNO may need to retain the substation to serve neighbouring customers.
Substation relocation. Sometimes a substation must be moved to allow redevelopment, not decommissioned.
For any site with a substation, early engagement with the DNO is essential. A substation may significantly constrain development options.
Temporary Disconnection vs Full Disconnection
Some projects need temporary disconnection rather than permanent. Reasons include:
Redevelopment where a new supply will be needed within months.
Major refurbishment.
Change of use requiring supply upgrade.
Temporary disconnection typically keeps the service cable in place but with the supply isolated. A subsequent reconnection is easier and cheaper than a new connection.
For permanent demolition, full service disconnection is required.
After Disconnection
Once disconnection is complete:
The service cable may be removed or left in place, depending on the DNO decision.
The customer account is closed.
No further charges accrue.
The DNO records the disconnection for future network reference.
If the site is redeveloped, a new connection will be required. Depending on the capacity needed and network conditions, the new connection may be simpler or more complex than the old one.
Common Pitfalls
Several issues come up repeatedly.
Confusing meter removal with service disconnection. Removing only the meter is insufficient for demolition.
Starting the process too late. Electricity disconnection lead times are often longer than gas. 4-6 months is not unusual for commercial sites.
Failing to coordinate with the DNO on substation work. Substation decommissioning can block development for months if not addressed early.
Poor documentation. Incomplete applications cause delays.
Underestimating cost. Large commercial disconnections can cost £10,000+.
Not planning for cable isolation verification during demolition.
Special Case: HV Disconnections
For sites with HV supplies (typically industrial, large commercial, or sites with customer substations), disconnection is a specialist activity.
The DNO performs the HV isolation and cable termination.
LV equipment on the customer side must be safely decommissioned.
Oil-filled transformers require specialist draining and disposal.
SF6 switchgear requires specialist gas recovery.
Cable testing and certification is thorough.
HV disconnection costs are typically £10,000 to £50,000+ and timescales are 4-9 months.
The Bottom Line
Electricity disconnection is a structured process that must be started early in any demolition or redevelopment project. The right type of disconnection depends on the project goals: meter removal for short-term isolation, service disconnection for demolition, substation decommissioning for major redevelopment. Engaging with the DNO or IDNO early, providing accurate documentation, and coordinating with other utility disconnections, are the key success factors. Treat electricity disconnection as part of the project critical path, not an afterthought.