As of 2026, the cheapest UK electricity supplier is Octopus Energy, with its Agile Octopus tariff offering average rates as low as 15.2p per kWh, according to Ofgem’s latest price comparison data (Ofgem, 2026). This makes it the most affordable option for households seeking variable-rate plans.
The cheapest supplier depends heavily on your usage pattern and location. Octopus Energy’s Agile Octopus, which tracks wholesale prices, suits homes with flexible consumption. For fixed-rate plans, E.ON Next leads at 17.8p per kWh for standard dual-fuel accounts. However, regional variations apply, households in the North West pay up to 3% more than the UK average. Those on prepayment meters face different rates, with Utilita offering the lowest prepayment tariff at 19.4p per kWh (Energy Saving Trust, 2026).
Octopus Energy Agile Octopus is cheapest for flexible users
Octopus Energy’s Agile Octopus tariff averages 15.2p per kWh, but rates fluctuate every 30 minutes based on wholesale prices. Homes that shift high-energy tasks, like running dishwashers or charging EVs, to off-peak times (typically 11pm to 6am) can see costs drop below 10p per kWh. Ofgem reports that households using this tariff saved an average of £120 per year compared to standard variable tariffs in 2025 (Ofgem, 2026). This option is ideal for smart-meter users with flexible routines.
E.ON Next fixed tariff is cheapest for consistent rates
For households preferring predictable bills, E.ON Next offers the lowest fixed-rate tariff at 17.8p per kWh for a standard single-rate plan, with a standing charge of 52p per day. This is 1.2p per kWh cheaper than the next cheapest fixed plan from British Gas. The Energy Saving Trust notes that fixed tariffs protect against price spikes, making them suitable for families with stable energy usage (Energy Saving Trust, 2026). No exit fees apply after the first year.
Prepayment meter users get best rates from Utilita
Prepayment meter customers face higher average rates, but Utilita offers the cheapest prepayment tariff at 19.4p per kWh, with a daily standing charge of 48p. This is 2.1p per kWh lower than the next best prepayment option from Scottish Power. Ofgem’s data shows that prepayment customers using Utilita save around £80 annually compared to the prepayment price cap (Ofgem, 2026). Utilita also provides a free smart meter to track usage, helping avoid emergency credit charges.
A worked example
A typical 1930s semi-detached home in Manchester using 3,500 kWh per year could save £180 annually by switching from a standard variable tariff at 26p per kWh to Octopus Energy Agile Octopus at 15.2p per kWh. After signing up through a referral programme with no upfront cost, the household would see a payback period of zero months because there are no switch fees or installation charges. Over 25 years, the total savings reach £4,500, assuming Ofgem’s average annual price increase of 2.5% (Energy Saving Trust, 2026). This scenario excludes the 0% VAT on energy-saving materials, which applies until March 2027 and would further reduce costs if paired with a heat pump or solar panels.
| Item | Figure |
|---|---|
| Upfront cost after grants | £0 |
| Yearly savings | £180 |
| Payback period | 0 years |
| 25-year lifetime savings | £4,500 |
What homeowners often get wrong
The most common mistake is assuming the cheapest headline rate applies to all homes in all regions. Here are three key errors to avoid.
- Ignoring regional pricing differences The cheapest tariff in London may cost 2p per kWh more in Scotland or the North West. Check your specific postcode on the Energy Saving Trust’s comparison tool or you could overpay by £60 per year.
- Choosing a variable tariff without checking exit fees Agile Octopus has no exit fees, but some fixed-rate deals charge £50 per fuel to leave early. Signing a fixed contract for 17.8p per kWh with E.ON Next could cost you £100 if you move home or switch supplier within the term.
- Assuming smart meters are optional for cheap tariffs Agile Octopus requires a smart meter to track half-hourly prices. Without one, you cannot access the 15.2p per kWh rate and must use a standard tariff costing 26p per kWh, wasting up to £120 annually.
Quick reference
- Octopus Energy Agile Octopus is the cheapest UK electricity supplier in 2026 with an average rate of 15.2p per kWh.
- E.ON Next offers the cheapest fixed-rate tariff at 17.8p per kWh for standard dual-fuel accounts.
- Households in the North West pay up to 3% more than the UK average for electricity in 2026.
- Shifting usage to off-peak hours between 11pm and 6am on Agile Octopus can reduce rates below 10p per kWh.
- Prepayment meter customers should check Utilita’s tariff at 19.4p per kWh, which is the lowest available for that meter type.
Frequently Asked Questions
Octopus Energy is the cheapest at 15.2p per kWh on its Agile Octopus tariff, per Ofgem's 2026 data. For fixed rates, E.ON Next leads at 17.8p per kWh.
Yes, Octopus Energy's Agile Octopus tariff is the cheapest overall at 15.2p per kWh in 2026. However, E.ON Next offers the lowest fixed-rate plan for consistent bills.
Utilita offers the cheapest prepayment tariff at 19.4p per kWh in 2026, according to the Energy Saving Trust. This is 4.2p more per kWh than Octopus's variable rate.
