If a power cut is what set you thinking about a battery for an Enfield home, start with the fact most sales pages leave out. A standard grid-tied battery switches off when the grid does. Backup is possible, but it has to be designed in and it costs more.
The rest of this guide covers what sits behind that: who runs the wires in Enfield, which form the network operator needs, how export limits work and what the reliability figures say. Our page on battery storage for Enfield homes covers the wider picture, including where a battery fits in the borough’s housing.
Who runs the network in Enfield
UK Power Networks runs the electricity network across London, the South East and the East of England, and two of its licence areas meet not far from the borough’s southern edge. The Enfield town-centre point sits in Eastern Power Networks, about 6.2 km from the boundary with London Power Networks on the licence maps published by UKPN and NESO. Our point check for Edmonton Green also falls in Eastern, with the London area beginning a little under two miles to its south-east. So some streets on the borough’s southern edge may be on the London network. The operator is the same either way, and UKPN’s area checker confirms it for any postcode.
The network operator is not your energy supplier. You keep the supplier and tariff you choose; UKPN owns the cables, and it is UKPN that the installer deals with when a battery is connected.
G98 or G99: what decides it
The Energy Networks Association’s rule G98 covers type-tested generation up to and including 16 A per phase, which is 3.68 kW on a single-phase supply. For a system that size the installer notifies the network before commissioning or no later than 28 days after it. Anything above 16 A per phase needs a G99 application, and that has to be approved before the work starts. A 4 kW inverter draws 17.39 A, just over the G98 line.
For a battery, the inverter is what counts. A hybrid inverter that runs panels and battery together, or a separate battery inverter added beside an existing one, can push an Enfield system over 3.68 kW. UK Power Networks’ Smart Connect service accepts G98 and G99 forms for solar PV and battery storage, and only approved installers can use it. In both cases the installer handles the paperwork for you.
Export limits and the 5 kW line
UK Power Networks says it automatically approves an application where the installation’s maximum export, after any export limitation scheme, is under 5 kW. In June 2024 it described that as approval for up to 5 kW of solar and battery storage, against an industry standard of 3.68 kW. An export limit is a setting that caps what the system sends to the grid, whatever the inverters could produce. On an Enfield semi or terrace, an export limit can keep a battery system on the simple side of that line; it caps what goes out to the grid, not what the battery can supply to the home.
Sometimes the supply itself needs work first. UKPN says that where no upgrade is needed there is nothing for you to pay it; where one is, cost and timing vary by project.
How often does the power go off?
Ofgem publishes reliability figures for each licence area. For Eastern Power Networks in 2024/25, they show about 44.6 supply interruptions per 100 customers and about 32.5 minutes lost per customer over the year, against 46.2 and 35.6 the year before. The figure across all 14 licence areas in Great Britain was 39.7 interruptions per 100 customers and 35.1 minutes. On our arithmetic, 44.6 per 100 averages out at fewer than one interruption per customer every two years. These are averages across the whole Eastern area, as reported before Ofgem’s final assessment, not a forecast for your street in Enfield.
The plain truth about backup
A grid-tied system must shut down when the grid fails. That is a safety requirement that protects engineers working on the lines, and it applies with or without panels. Keeping lights, a fridge or a boiler pump running in an Enfield power cut means backup hardware and separate wiring for the circuits you choose. EnSmart’s SolarAll-H inverter, the kit in our own installation photographs, publishes a UPS function with a 10-millisecond switchover for systems designed with backup. If outage cover is your reason for wanting a battery, say so at the survey, because it changes the design and the price.
What this means for an Enfield semi
Semis are 24.8% of Enfield’s 120,923 households, and ONS gives them a median EPC score of 60, with only 15.2% at band C or above. On the PVGIS 5.3 model, a 4 kWp due-south array at the Enfield town-centre point makes about 139 kWh in December and 476 kWh in June. A battery there earns its keep by moving daytime generation into the evening, mostly in the lighter months. Our page on solar panels in Enfield covers the roof side, and our guide to how long solar batteries last covers warranties and lifespan.
Residential batteries carry 0% VAT until 31 March 2027, then 5%, as our VAT on solar panels and batteries guide explains. For the boroughs around Enfield, see our solar panels in North London hub.
Sources: UK Power Networks, Our history, Areas we cover, Smart Connect, Solar and storage: cost, time and what’s involved, and news release of 10 June 2024; UK Power Networks Open Data, licence boundaries (December 2024); NESO, GIS Boundaries for GB DNO Licence Areas (May 2024); Energy Networks Association, EREC G98 Issue 2 (10 March 2025); Ofgem, RIIO-2 Electricity Distribution annual report 2024 to 2025 and supplementary datafile (15 January 2026); ONS Census 2021, TS044, Enfield E09000010; ONS, Energy efficiency of housing in England and Wales (28 October 2025); EnSmart published SolarAll-H specification; PVGIS 5.3 (European Commission JRC), PVGIS-SARAH3 2005–2023, run 15 October 2026; HMRC VAT Notice 708/6.