Ofgem’s latest data shows 2.3 million heat pump installations are needed by 2030 to meet net-zero targets. That is roughly one every 90 seconds for the next seven years. But here is the number that should worry every homeowner planning an upgrade: the UK is short of roughly 10,000 qualified electricians, and the gap is widening.
This ‘spark gap’, the shortage of electricians trained to connect, commission, and certify low-carbon heating and solar systems, is the subject of a recent commentary in Inside Housing. The piece argues that without a dramatic increase in training capacity, the government’s retrofit ambitions will remain just that, ambitions.
Why the spark gap matters for your home upgrade
Every heat pump, every solar array, every battery storage unit needs a final electrical connection. That connection must be signed off by a certified electrician registered with a competent person scheme such as NICEIC, NAPIT, or STROMA. Without that sign-off, you cannot claim the £7,500 Boiler Upgrade Scheme grant or the Smart Export Guarantee payments for solar.
Right now, installers report waiting 8 to 16 weeks for an electrician to complete the final connection. In some regions, Cornwall, Cumbria, and rural Wales, the wait can stretch to six months. That is six months of paying for a system you cannot use.
The Energy Saving Trust estimates that a typical 3-bed semi with a 4kW heat pump saves around £285 a year on heating bills compared to an old gas boiler. But that saving starts only after the spark has signed off. Every week of delay is a week of lost savings, roughly £5.50 a week for that same home.
Who qualifies, and who doesn’t
The shortage hits hardest at the small-scale end of the market. Large housing associations and new-build developers book electricians months in advance, paying premium rates. Individual homeowners, especially those in semi-detached or terrace houses, are left scrambling for available sparks.
But the problem is quantity as much as specialisation. A standard domestic electrician who rewires a kitchen may not hold the extra certification needed for heat pump commissioning (City & Guilds 6187-02 or equivalent). Only about 15% of the UK’s 250,000 registered electricians have this qualification, according to industry body Electrotechnical Skills Partnership.
That means even if you find a spark, they may not be able to do the job. The catch is that training for these specialist skills takes 12 to 18 months, and the government has not yet funded a dedicated retrofit electrical training programme.
What it costs a typical 3-bed semi
If you are planning a heat pump installation, the electrical work typically adds £800 to £1,500 to the total cost, depending on whether your consumer unit needs upgrading. For solar PV with battery storage, the electrical work can run £1,200 to £2,000. Those figures assume a spark is available. With the shortage, some installers now add a ‘spark scarcity surcharge’ of 10–20% on the electrical portion of the quote.
The Boiler Upgrade Scheme covers £7,500 of the heat pump itself, but not the electrical connection. Homeowners should budget for that separately, and ask the installer, upfront, whether the electrical work is included in the fixed price.
Officials at the Department for Energy Security and Net Zero have not confirmed when a dedicated electrical training fund will open. But the Home Decarbonisation Skills Training Competition, which closed in March 2025, allocated £6.4 million for retrofit training, none of it specifically for electricians.
What you can do now
If you are planning a low-carbon heating or solar installation in the next 12 months, book your electrician at the same time as your installer. Do not wait for the system to arrive. Ask your installer for a written timeline that includes the electrical commissioning date. And check that the electrician holds both a competent person scheme registration AND a specific heat pump or solar PV qualification.
Households on standard variable tariffs can apply for the Boiler Upgrade Scheme through gov.uk from 4 November 2025. Eligibility closes on 31 March 2027. But without a spark, the grant is just a piece of paper.
Frequently Asked Questions
Look for an electrician registered with NICEIC, NAPIT, or STROMA who also holds a City & Guilds 6187-02 or equivalent heat pump commissioning certificate. The Microgeneration Certification Scheme (MCS) installer directory can help, as MCS-certified installers often subcontract only to similarly qualified sparks.
No. Under Part P of the Building Regulations, electrical work in a dwelling must be carried out by a registered competent person or notified to the local authority building control. Doing it yourself voids your insurance, invalidates the manufacturer's warranty on the heat pump or solar system, and means you cannot claim the Boiler Upgrade Scheme grant or Smart Export Guarantee payments.
