One unit of electricity in the UK currently costs around 26.11p per kilowatt-hour (kWh) under the Ofgem Energy Price Cap for the period of July to September 2026. This figure represents the maximum amount suppliers can charge for each unit of electricity you use on a Standard Variable Tariff.
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Understanding the kilowatt-hour (kWh)
A 'unit' of electricity is universally measured in kilowatt-hours (kWh). A kilowatt-hour represents the energy consumed by using one kilowatt of power for one hour, or 1,000 watts for one hour. It's the standard metric energy suppliers use to calculate your bill, much like how litres measure fuel or miles measure distance.
Making kWh tangible: appliance usage examples
Understanding kWh becomes clearer when you apply it to everyday appliances. For instance, a 100-watt light Bulb left on for 10 hours uses 1 kWh of electricity (100 watts x 10 hours = 1,000 watt-hours = 1 kWh). Similarly, a typical oven operating at 2,000 watts for 30 minutes would consume 1 kWh. A kettle, often around 3,000 watts, would use 1 kWh if boiled for 20 minutes. Knowing these figures helps you visualise your energy consumption.
The Ofgem energy price cap explained
The energy price cap, set by the regulator Ofgem, limits the maximum price energy suppliers can charge for each unit of electricity and the daily standing charge. It was introduced on 1 January 2019 to protect customers on standard variable tariffs from excessive charges. Ofgem reviews and adjusts this cap every three months to reflect changes in wholesale energy prices and other industry costs. For a deeper dive into how the cap works, you can read our Ofgem Price Cap explained article.
Current unit rates under the cap
For the period of July to September 2026, the average electricity unit rate under the Ofgem Energy Price Cap is 26.11p per kWh for customers paying by Direct Debit. It's important to remember that this is a cap on the unit rate, not a limit on your total bill; the more energy you use, the more you will pay.
Unit rate vs standing charge: what's the difference?
Your electricity bill comprises two main components: the unit rate and the standing charge. The unit rate is the cost per kilowatt-hour (kWh) of electricity you consume, directly reflecting your usage. The standing charge, on the other hand, is a fixed daily fee that covers the costs of providing and maintaining your connection to the electricity network, regardless of how much energy you use. Both the unit rate and the standing charge are subject to the Ofgem Energy Price Cap. To better understand all the elements of your bill, explore our guide on understanding your energy bill.
Other charges and levies
Beyond the unit rate and standing charge, your electricity bill also includes other elements. These typically cover wholesale costs, network charges for maintaining the grid, government environmental and social schemes, and Value Added Tax (VAT). An example of such a scheme is the Renewables Obligation (RO), which supports low-carbon electricity generation. These components contribute to the overall cost of supplying electricity to your home.
Wholesale energy prices
Wholesale energy prices are the cost energy suppliers pay for electricity and gas on the open market. These prices are the largest factor in determining your unit rate and are highly volatile, influenced by global supply and demand, geopolitical events, and even weather conditions. For instance, gas prices significantly impact electricity costs in the UK, as gas-fired power stations often set the market price.
Network charges and environmental levies
Network charges cover the costs of building, maintaining, and upgrading the vast infrastructure of pipes and wires that transport energy to your home. These are paid to Distribution Network Operators (DNOs) and are passed on through your bill. Environmental levies, or policy costs, fund government initiatives aimed at supporting green energy projects, improving energy efficiency, and providing financial assistance to vulnerable households. For example, the RO scheme places an obligation on suppliers to source a proportion of electricity from renewable sources.
Supplier business costs
Suppliers also factor in their own operating costs, which include expenses for customer service, billing, metering, and marketing. A regulated profit margin is also included in the price cap calculation, ensuring suppliers can cover their running costs and earn a reasonable return. These business costs contribute to the final unit rate and standing charge you see on your bill.
Why costs differ across Great Britain
Electricity prices are not uniform across Great Britain; both the unit rate and the standing charge can vary depending on your region. These regional differences primarily stem from variations in network costs, which are influenced by factors like population density, geography, the age of the infrastructure, and the specific Distribution Network Operator (DNO) in your area. For example, areas with a dispersed rural population may have higher network costs per customer due to the extensive infrastructure required.
Finding your local unit rate
To find your exact unit rate and standing charge, it's best to check your energy bill or contact your energy supplier directly. While national averages are useful benchmarks, your specific postcode and payment method (e.g., Direct Debit, prepayment) will determine the precise rates you pay under the price cap.
Monitoring consumption with smart meters
Smart meters provide real-time data on your energy consumption, allowing you to see exactly how much electricity you're using and what it's costing you. This transparency can be a powerful tool for understanding your usage patterns and identifying areas where you might reduce consumption.
Practical tips for reducing kWh usage
Managing your electricity usage doesn't have to feel like a sacrifice; it's about smart management and control. Simple changes can make a difference, such as switching off lights and appliances when not in use, optimising your heating and cooling, and using energy-efficient appliances. The average UK home uses approximately 2,500 kWh of electricity per year1, so understanding your own usage against this benchmark can help you identify opportunities to be more efficient. For more ideas, check out our energy saving tips.
Choosing the right tariff for your needs
Regularly reviewing your energy tariff is crucial for effective energy management. While the price cap protects customers on standard variable tariffs, exploring different tariff options, such as fixed-rate deals (though these are not covered by the price cap), might offer more stability or better value depending on your consumption habits and market conditions.
