What the House of Commons Library tells us about your electricity bill

The average UK household paid £1,568 for electricity in 2023, according to Ofgem data. But where does that money actually go? The House of Commons Library has published a detailed breakdown, and the answer is not what most people expect.

As reported by the House of Commons Library, wholesale energy accounts for around 40% of a typical bill. Network charges, the cost of getting power from the grid to your home, take another 25%. Policy costs, including subsidies for renewables and social schemes, add 12%. The remaining 23% covers supplier operating costs, VAT, and profit margins.

Why this matters for your monthly direct debit

The key insight: two-thirds of your bill is not about how much electricity you use. Network charges and policy costs are largely fixed per household, not per kilowatt-hour. That means if you cut your electricity use by 20%, say by switching off lights and appliances, your bill falls by only about 8%, because the fixed portions stay the same. Ofgem confirmed this pattern in its 2024 cost breakdown, showing that the standing charge (which covers network and policy costs) has risen 27% since 2021.

For a typical 3-bed semi using 3,100 kWh a year, the standing charge alone now adds around £300 annually. That is the part you cannot reduce by turning things off.

What this means for eco-home upgrades

The logical response is to use less electricity and bypass the fixed costs entirely. Solar photovoltaic panels, for example, generate power behind your meter, so every kilowatt-hour you self-consume avoids the wholesale price (40%) plus the supplier margin (23%), but not the network or policy charges, which are still billed via the standing charge. A typical 4 kW solar system can save a household £400–£600 a year on electricity, according to Energy Saving Trust estimates, by reducing the variable portion of the bill.

Heat pumps complicate the picture further. They use electricity to produce heat at a ratio of 3:1 or better, which means a home switching from gas to a heat pump might see its electricity bill rise by 50–80%. But because the heat pump replaces gas, the total energy bill often falls by 20–30%. The catch: network charges on electricity are higher than on gas, so the savings are smaller than the efficiency gain suggests. The government’s Boiler Upgrade Scheme offers £7,500 towards a heat pump, partly to offset these network cost distortions.

Policy costs and the EPC rating link

Policy costs, the 12% chunk that funds renewable subsidies and social tariffs, are set to rise further. Ofgem’s latest projections show a 15% increase in the ‘green levy’ component by 2026, adding roughly £30 a year to the typical bill. Homes with an EPC rating of C or above are less affected, because they use less energy overall, but the policy cost per kilowatt-hour remains the same. Improving your EPC from D to C by adding loft insulation (costing £500–£1,000) can reduce total energy use by 15–20%, which cuts the variable portion of both electricity and gas bills.

Yet the House of Commons Library analysis exposes a hard truth: the fixed network and policy costs mean that even a highly efficient home still pays a substantial base charge. For homeowners considering upgrades, the priority should be self-generation (solar) or fuel switching (heat pump) rather than just efficiency, because those are the only ways to reduce the fixed-cost burden.

What you can do now

First, check your electricity bill for the standing charge rate. If it is above 60p per day, you may be on a poor-value tariff, compare suppliers via Ofgem’s accredited sites. Second, get an EPC assessment (£60–£120) to identify the cheapest efficiency gains. Third, if you have a south-facing roof, get quotes for solar panels; the payback period is now typically 8–12 years, and the Smart Export Guarantee pays you for surplus power. The Great British Insulation Scheme closed on 31 March 2026. It funded insulation measures only and never covered windows or glazing.