Electricity vs Gas: UK Cost Comparison for 2026

Understanding the electricity vs gas cost in the UK for 2026 is essential for anyone making decisions about home heating, cooking, or hot water. With gas at 5.74p per kWh and electricity at 24.67p per kWh under the Q2 2026 Ofgem price cap, electricity costs more than four times as much per unit of energy. But this headline figure tells only part of the story. When you factor in the efficiency of different heating technologies, time-of-use tariffs, and the trajectory of energy policy, the comparison becomes far more nuanced — and far more important for your wallet.

Electricity vs gas: which is cheaper in the UK in 2026?

Gas is currently cheaper per unit than electricity in the UK, at roughly a quarter of the cost per kWh. However, heat pumps are three to four times more efficient than gas boilers, meaning the actual cost of heating with a heat pump is comparable to or lower than gas. For direct electric heating without a heat pump, gas remains significantly cheaper. The gap is expected to narrow as the UK moves toward electrification and gas prices face increasing carbon levies.

Current UK Energy Prices: Q2 2026 Ofgem Price Cap

The Ofgem price cap sets the maximum unit rate and standing charge that energy suppliers can charge domestic customers on standard variable tariffs. As of Q2 2026:

The “typical annual bill” figures are based on Ofgem’s Typical Domestic Consumption Values (TDCV): 2,700 kWh of electricity and 11,500 kWh of gas per year for a medium-use household.

The Spark Gap: Why It Matters for Heating Decisions

The “spark gap” is the ratio between electricity and gas prices. In Q2 2026, the spark gap is approximately 4.3:1 — meaning electricity costs 4.3 times more than gas per kWh.

This ratio is critically important for the economics of heat pumps. A heat pump uses electricity to produce heat, but it does so at an efficiency of 300-400% (a Coefficient of Performance of 3.0-4.0). This means that for every 1 kWh of electricity consumed, a heat pump produces 3-4 kWh of heat.

For a heat pump to cost the same to run as a gas boiler (at 92% efficiency), the spark gap needs to be at or below the heat pump’s COP. Here is the maths:

• Gas boiler at 92% efficiency: 1 kWh of heat costs 5.74p / 0.92 = 6.24p
• Heat pump at COP 3.0: 1 kWh of heat costs 24.67p / 3.0 = 8.22p
• Heat pump at COP 3.5: 1 kWh of heat costs 24.67p / 3.5 = 7.05p
• Heat pump at COP 4.0: 1 kWh of heat costs 24.67p / 4.0 = 6.17p

At the current spark gap, a heat pump running at a COP of 4.0 or above is slightly cheaper to run than a gas boiler. At a COP of 3.0-3.5 (more typical for UK retrofits), the heat pump is 13-32% more expensive per unit of heat than gas — but the gap is much smaller than the raw 4.3:1 ratio suggests.

Running Cost Comparison: Heating a Typical UK Home

For a 3-bedroom semi-detached house with average insulation requiring approximately 12,000 kWh of heat per year:

Key takeaways from this comparison:

• A well-performing heat pump (COP 3.5+) is comparable to a modern gas boiler on running costs
• Direct electric heating is by far the most expensive option — roughly four times the cost of gas
• Replacing an old G-rated gas boiler with a modern A-rated one saves around GBP 235 per year
• For off-grid homes on oil or LPG, a heat pump is almost always cheaper to run

Time-of-Use Tariffs: Changing the Maths

Standard flat-rate tariffs charge the same price for electricity regardless of when you use it. Time-of-use (TOU) tariffs offer cheaper rates during off-peak periods (typically overnight and during the afternoon) and higher rates during peak demand (usually 4-7pm).

Popular TOU tariffs in 2026 include:

• Octopus Go: Off-peak rate of approximately 12p/kWh from 00:30-05:30, with a peak rate of around 30p/kWh
• Octopus Flux: Designed for solar and battery users, with import rates varying between 17-36p/kWh and export rates of 5-21p/kWh
• Economy 7: The traditional off-peak tariff with 7 hours at a reduced rate (typically 10-15p/kWh) and 17 hours at a higher rate
• Octopus Agile: Half-hourly variable pricing that tracks wholesale costs, sometimes dropping below 5p/kWh or even going negative

For heat pump owners, TOU tariffs can dramatically reduce running costs. If you can shift the majority of your heat pump’s operation to off-peak hours — using the thermal mass of your home and a hot water cylinder as storage — the effective electricity cost for heating drops to 12-15p/kWh. At a COP of 3.5, that brings the cost per kWh of heat down to 3.4-4.3p — significantly cheaper than gas.

Similarly, if you have solar panels, running the heat pump during daylight hours when the panels are generating reduces or eliminates the electricity cost entirely.

Standing Charges: The Hidden Cost

Standing charges are fixed daily fees charged regardless of how much energy you use. In Q2 2026, the combined standing charges for a dual-fuel household are approximately GBP 340 per year (GBP 225 electricity + GBP 115 gas).

For homes that switch entirely to electric heating (such as a heat pump) and disconnect from the gas grid, eliminating the gas standing charge saves GBP 115 per year. This saving should be factored into any comparison between gas and electric heating.

However, disconnecting from gas also means electric cooking, electric hot water (or heat pump hot water), and no gas hob — which some homeowners are reluctant to give up. Induction hobs are an excellent electric alternative, but the cost of switching from gas to induction (including potentially upgrading the electrical circuit) should be considered.

Why Electricity Is More Expensive: Policy and Infrastructure

The 4.3:1 price difference between electricity and gas is not primarily about the cost of generating power versus extracting gas. The main drivers are:

• Environmental and social levies. Electricity bills carry a higher proportion of policy costs, including renewable energy subsidies, the Warm Home Discount, and network investment charges.
• Transmission and distribution costs. The electricity grid is more complex and expensive to maintain than the gas network.
• Low gas prices historically. The UK has benefited from relatively cheap North Sea gas and imported gas, keeping the raw commodity price low.
• Carbon pricing. Gas prices include less environmental cost than electricity, even though burning gas produces significant CO2. The government has discussed rebalancing this through a carbon levy on gas or a reduction in electricity levies, but no firm policy has been implemented as of 2026.

There is growing consensus that the spark gap needs to narrow for heat pumps to become economically attractive at scale. The Climate Change Committee has repeatedly recommended shifting levies from electricity to gas, which would reduce the electricity-to-gas price ratio from 4.3:1 to around 2.5-3:1. If this happens, heat pumps would be clearly cheaper to run than gas boilers for almost all homes.

What This Means for Your Home Energy Decisions

Here are practical implications for common scenarios:

• If you are on the gas grid with an old boiler: Upgrading to a modern condensing boiler is the quickest win for reducing heating costs. A heat pump is a strong option if your home is well insulated and you can access the BUS grant.
• If you are off-grid (oil/LPG): A heat pump is almost certainly cheaper to run than your current system, even at current electricity prices. The BUS grant of GBP 7,500 makes the economics compelling.
• If you rely on direct electric heating: You are paying the highest rates for the least efficient heating. An air source heat pump would cut your heating costs by 60-75%. Even better insulation reduces the total demand.
• If you have solar panels: Using solar generation to power a heat pump during the day effectively makes your heating nearly free for those hours. Adding battery storage extends this further.
• If you are considering going all-electric: The economics depend on your TOU tariff access, solar generation, and the COP your heat pump achieves. For well-insulated homes with solar, going all-electric is already cost-effective.

To compare options for your specific situation, get a free quote for heating system upgrades and energy improvements.

Frequently Asked Questions

Will the electricity-to-gas price ratio change?

Almost certainly. The government’s Net Zero strategy requires a shift from gas to electricity for heating. Making this affordable requires narrowing the spark gap. The most likely mechanism is shifting environmental levies from electricity bills to gas bills or to general taxation. The timing is uncertain, but the direction of travel is clear — electricity is expected to become relatively cheaper compared to gas over the next 5-10 years.

Is it cheaper to heat water with gas or electricity?

With a gas combi boiler (90% efficient), heating 100 litres of water costs approximately 26p. With an electric immersion heater (100% efficient), the same volume costs approximately 103p — four times as much. With a heat pump heating a cylinder (COP 3.0-3.5), the cost drops to 29-34p — comparable to gas. If you have solar panels generating during the day, heating water with an immersion heater during solar generation is effectively free.

Should I switch from gas cooking to electric?

From a pure cost perspective, gas cooking is cheaper per kWh. However, cooking accounts for only 3-5% of a typical household’s energy bill, so the actual cost difference between gas and electric cooking is only GBP 30-50 per year. If switching to electric cooking (ideally induction) allows you to disconnect from the gas grid and eliminate the gas standing charge (GBP 115/year), you come out ahead financially.

What is the cheapest way to heat a UK home in 2026?

For a well-insulated home with solar panels and a time-of-use tariff, an air source heat pump is the cheapest option. For an average home on the gas grid without solar, a modern condensing gas boiler remains the cheapest. For off-grid homes, a heat pump is cheaper than oil or LPG. In all cases, improving insulation first reduces the total heating demand and makes every heating system cheaper to run.