The typical household will spend £1,568 on gas and electricity this year under the October price cap, yet 88% of adults cannot name a single component of that bill. A survey conducted by Smart Energy GB and reported by Whitehaven News found that fewer than one in ten people could correctly identify wholesale costs, network charges, or policy levies as line items on their statement. This blind spot matters because it stops homeowners from making rational decisions about where to cut costs.
As reported by Whitehaven News, the research reveals a knowledge gap that energy suppliers and Ofgem have done little to close. Most domestic bills still show a single line for “electricity charges” and another for “gas charges”, with no breakdown of the four main cost buckets: wholesale energy (about 40-50%), network costs (roughly 20-25%), policy and environmental levies (around 10-15%), and supplier operating costs plus margin (the remainder).
Why the breakdown matters for your bill
Wholesale costs fluctuate with global gas prices, that’s the part of your bill that rose sharply in 2022 and has since fallen. Network charges, by contrast, are largely fixed. Ofgem sets these annually to cover the cost of maintaining the grid, and they appear as a daily standing charge on most tariffs. Policy levies fund schemes like the Renewable Heat Incentive and the Warm Home Discount, these are also baked into the standing charge or spread across unit rates.
The catch is that standing charges have risen faster than unit rates in recent years. Ofgem data shows the average electricity standing charge increased from 45p per day in 2019 to 60p per day in 2024, a 33% rise. For a household using 2,900 kWh of electricity a year, that means roughly £219 of the annual bill is fixed, regardless of how much you use. Solar panels and insulation reduce your consumption, but they cannot reduce your standing charge.
What this means for eco-home upgrades
If you don’t know that network charges and policy levies make up 30-40% of your bill, you might overestimate the savings from switching to a heat pump or adding solar panels. The Energy Saving Trust estimates a typical 3.5 kW solar system saves about £300-£400 a year on a standard tariff, but that saving is calculated against the unit rate, not the standing charge. If your standing charge is 60p per day, your solar system saves you nothing on that portion.
Similarly, a heat pump can cut your heating bill by 30-50% compared to a gas boiler, but the savings depend on your home’s insulation and the efficiency of your heating system. Without understanding the split between variable and fixed costs, homeowners risk investing in upgrades that deliver less than expected.
Three things you can do today
First, request an itemised bill from your supplier. Under Ofgem rules, suppliers must provide a breakdown on request, though most don’t volunteer it. Second, check your EPC rating. A home with an EPC rating of D or lower leaks heat through walls and loft spaces, meaning you pay for energy you never use. Third, compare your standing charge across suppliers. Some regional networks charge higher standing fees than others. You can switch supplier to one with a lower standing charge, though the savings are typically modest, often £20-£50 per year.
The survey data from Smart Energy GB suggests that energy literacy is lowest among younger renters and highest among older homeowners. But the principle applies to everyone: you cannot manage what you do not measure. The next time your energy bill arrives, look past the total figure. Ask your supplier for the line-by-line breakdown. Then decide which part of the bill you can actually reduce.
Frequently Asked Questions
Your bill is split into four main parts: wholesale energy costs (the price your supplier pays for gas and electricity), network costs (maintaining the grid and pipes), policy and environmental levies (government schemes for renewables and energy efficiency), and supplier operating costs plus profit. Ofgem publishes the exact percentages each quarter.
No. Solar panels reduce the amount of electricity you buy from the grid, which lowers the unit-rate portion of your bill. But the standing charge is a fixed daily fee that covers network costs and policy levies, and it remains the same regardless of your generation. To minimise standing charges, you would need to switch to a supplier with a lower standing charge tariff.
