The price cap will rise by £63 in October 2024 – the third increase this year. Yet a new survey from Bristol Live reveals that 9 in 10 Brits cannot name what their energy bill actually pays for. That is a problem, because the single biggest lever for cutting household costs is understanding where the money goes.
As reported by Bristol Live, the survey of 2,000 adults found that only 11% could identify the three biggest line items: wholesale energy, network costs, and policy levies. The rest guessed wildly – some thought VAT was the largest component (it’s 5%), others blamed smart meter rollouts (they cost less than £10 a year per household).
What a typical bill actually contains
Ofgem’s breakdown for a typical dual-fuel household using 12,000 kWh of gas and 2,900 kWh of electricity shows wholesale costs at roughly 45% of the total – around £640 a year at current cap levels. Network charges – the cost of pylons, pipes, and local distribution – take another 23%, or about £330. Policy costs – subsidies for wind farms, social tariffs, and the Warm Home Discount – consume 13%, around £180. VAT, supplier operating costs, and profit margins make up the rest.
Yet the Bristol Live survey found that more than half of respondents believed wholesale costs were under 20% of their bill. The gap between perception and reality is not trivial: it means homeowners cannot assess whether a fixed tariff is competitive, or whether a heat pump or solar array will actually pay back.
How understanding your bill cuts costs
The catch is that most people focus on the wrong number. Switching to a cheaper tariff saves you money only on the wholesale element – about 45% of the bill. The other 55% is mostly fixed by where you live and what the government mandates. But that 55% can be shrunk by upgrading your home’s energy efficiency.
Improving your EPC from D to C cuts heat demand by roughly 25%, according to the Energy Saving Trust. A typical 3-bed semi in the South West spends £1,200 a year on gas. An EPC C might reduce that to £900. The saving comes not from the wholesale price but from using fewer units – which reduces network charges and policy levies proportionally.
Installing solar panels cuts electricity bills by 60-70% on average, again reducing the per-kWh impact of network and policy costs. A heat pump – if properly sized and insulated – can halve gas consumption. Yet the survey suggests most homeowners never connect these dots because they cannot see the cost structure.
What this means for your next upgrade
The government’s Boiler Upgrade Scheme offers £7,500 off a heat pump. But to know whether that investment makes sense, you need to know your current gas consumption – and that means reading your bill, not just the direct debit amount. The same logic applies to solar: the Smart Export Guarantee pays you for excess electricity, but only if you understand your export rate versus your import cost.
Energy suppliers are required by Ofgem to show a cost breakdown on bills – a pie chart or table. Yet the Bristol Live survey found that 72% of respondents said they never looked at it. That is a missed opportunity. Ofgem’s own data shows that households who engage with their bill save an average of £150 a year, mostly through switching tariffs or adjusting usage patterns.
If you are a homeowner considering an eco-upgrade, start by pulling your last 12 months of bills. Identify your wholesale cost per kWh (typically 27-30p for electricity, 6-7p for gas under the current cap). Compare that with any fixed tariff offers. Then calculate how much you would save by reducing consumption – not just by switching suppliers.
The survey from Bristol Live is a wake-up call. Energy bills are not a mystery – they are a balance sheet. And the first step to cutting them is knowing what you are paying for.
Frequently Asked Questions
Your supplier must include a cost breakdown – either a pie chart or a table – on your bill or online account. Look for sections labelled 'Wholesale costs', 'Network charges', 'Policy costs', and 'VAT'. If you cannot find it, ask your supplier under the 'right to information' rules from Ofgem.
Indirectly, yes. Policy costs are charged per kWh of energy used, so using less energy reduces the total amount you pay in policy levies. A move from EPC D to C typically cuts gas use by 25%, which reduces your contribution to schemes like the Warm Home Discount and renewable subsidies.
