Cheap overnight electricity explained

Utilising cheaper overnight electricity can significantly reduce household energy bills, transforming how you manage your home's power consumption. This approach, often through dual-rate tariffs, encourages energy use when demand on the grid is lower, typically during off-peak hours. It's about taking control and making your energy work harder for you, rather than simply trying to use less.

Fuse Energy helps you take control of your energy use with modern dual-rate tariffs, making it easier to save on your bills. Click here to switch to Fuse Energy today.

Understanding cheap overnight electricity

Cheap overnight electricity refers to tariffs that offer lower unit rates during specific periods, usually at night, when overall demand on the National Grid is reduced. These tariffs are designed to incentivise consumers to shift their energy-intensive activities to these quieter times, balancing the grid and potentially lowering their costs.

What are dual-rate tariffs?

Dual-rate tariffs, also known as time-of-use (TOU) tariffs, divide the day into different periods, each with its own electricity rate. Typically, you'll find a higher "peak" rate during busy times (like mornings and early evenings) and a lower "off-peak" rate, often overnight, when fewer people are using electricity. To accurately track consumption across these different periods, these tariffs require either a smart meter or a multi-register meter.

Economy 7 vs modern off-peak rates

Economy 7 is a long-standing dual-rate tariff that provides seven hours of cheaper electricity, usually overnight. The exact timings can vary significantly by region and even by individual meter, typically falling between midnight and 8am. Historically, it has been popular for homes with electric storage heaters or immersion water heaters, which can charge up during the cheaper night hours.

Modern off-peak tariffs, often enabled by smart meters, offer greater flexibility than traditional Economy 7. While many still focus on overnight savings, some newer tariffs can have more dynamic off-peak windows, or even offer "plunge pricing" during the day when renewable generation is high. These modern options are particularly beneficial for electric vehicle (EV) charging and smart home appliances that can be programmed to run automatically during cheaper periods.

How off-peak tariffs work

The core principle of off-peak tariffs is straightforward: use electricity when it's cheapest. This requires understanding your tariff's specific timings and having the right technology to measure your usage accurately.

Identifying your off-peak hours

Your off-peak hours are specific to your tariff and supplier, and with Economy 7, they can even vary by region and meter. While a common window is between 10pm and 8am, it's crucial to check your specific tariff details, typically found in your online account or on your electricity bill. For older Economy 7 meters, the timings might be displayed on the meter itself, or you may need to contact your meter operator.

The role of smart meters

Smart meters are highly beneficial for modern dual-rate tariffs, as they automatically send readings to your supplier, accurately recording how much electricity you use during peak and off-peak periods. This eliminates the need for manual readings and ensures you're billed correctly for your consumption at different rates. While smart meters can provide access to more flexible tariffs, including dual-rate options, eligibility can also extend to compatible multi-register manual meters, which allow for different rates throughout the day.

Legacy meters and the RTS phase-out

Some older Economy 7 tariffs relied on Radio Teleswitch Service (RTS) meters, which used a longwave radio signal to switch between peak and off-peak rates. However, the industry-wide phase-out of RTS began on 30 June 2025. If you have an RTS meter, your current supplier is responsible for replacing it with a smart meter, usually at no cost to you. Once this upgrade is complete, you'll be able to explore modern dual-rate tariffs.

Maximising your savings with off-peak electricity

Shifting your energy use to off-peak hours can lead to noticeable savings. The average UK home uses around 2,500 kWh of electricity per year, so making smart choices about when you use power can have a real impact.

Shifting high-consumption activities

The key to saving money with off-peak tariffs is to move as much of your energy-intensive usage as possible to the cheaper hours. This means planning your daily routine to align with your tariff's off-peak window.

Appliances best suited for off-peak use

Several household appliances are ideal candidates for off-peak operation:

• Electric vehicle (EV) charging: Charging an EV overnight is one of the most significant ways to benefit from cheaper rates, as EVs consume a large amount of electricity.
• Washing machines and dishwashers: Many modern appliances have timers, allowing you to set them to run during the night.
• Storage heaters and immersion heaters: These can be programmed to draw power during off-peak times, storing heat or hot water for use throughout the day.
• Tumble dryers: While noisy, running a tumble dryer overnight can also contribute to savings if noise isn't an issue for neighbours.

Monitoring your usage and costs

To ensure you're making the most of your off-peak tariff, regularly monitor your energy usage. Most suppliers offer apps or online accounts that provide detailed breakdowns of your consumption, allowing you to see how much you're using during peak versus off-peak times. This insight helps you refine your habits and identify further opportunities for savings.

Choosing the right cheap overnight electricity tariff

Selecting the best dual-rate tariff depends on your household's specific needs and habits.

Assessing your energy habits

Before switching, understand your typical energy consumption patterns. If you can't realistically shift a significant portion of your electricity use to off-peak hours, a dual-rate tariff might not be the most cost-effective option, as peak rates are often higher than a standard single-rate tariff. Consider your work schedule, appliance usage, and whether you have an EV or storage heating.

Comparing tariff options

Research available dual-rate tariffs from various energy suppliers. Look beyond just the off-peak rate; compare the peak rates, standing charges, contract length, and any exit fees. Some tariffs might offer longer off-peak windows or additional benefits for EV owners.

What to look for in a supplier

When choosing a supplier for an off-peak tariff, consider factors beyond just price. Look for clear communication about your off-peak hours, easy-to-use tools for monitoring your usage, and reliable customer support. A supplier that empowers you with information and assistance can make a big difference in maximising your savings.

Managing your energy bills should be clear and easy to understand. Fuse Energy focuses on straightforward pricing, so you can see exactly what you're paying without unnecessary complexity. If you have a smart meter, you can view detailed usage data through the app or website, helping you understand how you can lower your bills. If you don't have a smart meter, Fuse Energy can upgrade your non-smart meter, completely for free. This can make it easier to track spending and make informed decisions about your energy use. Our 24/7 human support team is always on hand with fast response times whenever you need help. Click here to switch to Fuse Energy today. Find out about our mission by clicking here.