Understanding Energy Tariffs: What You Need to Know

Navigating energy tariffs in the UK can feel overwhelming, but making the right choice could mean significant savings on your monthly bills. With a variety of tariffs available, finding the perfect one for your lifestyle can help you control your energy use, reduce costs, and even support renewable energy.

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Whether you're looking to save money or simply get a better handle on your household expenses, understanding your energy options is the first step toward a more efficient and affordable home.

Energy Tariffs: Everything you need to know

• Before switching, assess your energy consumption patterns and whether you have solar panels or battery storage to benefit from specific tariffs.
• Fixed-rate, variable-rate, time-of-use, and green energy tariffs each offer unique benefits, so choose one that fits your lifestyle and financial goals.
• If you have solar panels, look for Export Tariffs and Battery-Specific Tariffs to maximise savings by exporting surplus energy or using cheaper off-peak rates.
• Use online comparison tools to compare tariffs, check for exit fees, and ensure the new plan aligns with your needs before making the switch to a better deal.

Why Energy Tariffs Matter

Energy tariffs determine how much you pay for electricity and gas, directly impacting your monthly bills. The right tariff can help you save money, manage costs more effectively, and even take advantage of cheaper rates during off-peak hours.

In the past, many homeowners stuck with standard tariffs without exploring other options. However, with energy prices fluctuating—driven by global events like the surge in natural gas costs—choosing the right tariff has become more important than ever. 

UK energy prices have risen by 62% in just four years, making it important to find a tariff that fits your usage habits and budget. The right choice can mean lower bills and more financial stability, while the wrong one could leave you paying more than necessary.

What Is the Energy Price Cap?

The Energy Price Cap is a regulation set by the UK government to limit the maximum price that energy suppliers can charge households for gas and electricity. Its main goal is to protect consumers from unfairly high energy costs, especially in times of fluctuating energy prices. The cap is designed to ensure that energy prices remain affordable while also ensuring that suppliers can still cover their costs and remain financially viable.

The cap is set by Ofgem, the UK’s energy regulator, and is reviewed every six months to reflect changes in the cost of supplying energy. The price cap is not a set price for all households but a cap on the rates energy suppliers can charge per unit of gas and electricity (measured in kilowatt-hours or kWh).

From 1 April to 30 June 2025, the energy price cap will be set at £1,849 per year for a typical household using both electricity and gas and paying by Direct Debit. This represents a 6.4% increase compared to the cap of £1,738 that was in place from 1 January to 31 March 2025.

Who Does the Energy Price Cap Affect?

The Energy Price Cap applies to default tariffs—the standard variable rate that consumers are automatically moved to when they either don't choose a new tariff or their fixed-rate plan ends. If you're on a fixed-rate energy plan, the price cap does not affect you directly, unless your fixed-term contract expires, and you revert to the default tariff.

It's also important to note that the cap is not applied to energy tariffs that are specifically tailored to certain customer needs, such as prepayment meters or dual fuel tariffs. However, the principle behind the cap is still designed to ensure affordability for these customers as well.

Your Energy Tariff Options

Energy suppliers in the UK offer a wide range of tariffs, each designed to cater to the diverse needs of consumers. Whether you're someone who values predictable bills, someone flexible enough to take advantage of cheaper rates, or someone passionate about reducing your environmental impact, there’s a tariff for you.

Fixed and Variable Rate Tariffs

The most common tariffs are fixed-rate and variable-rate tariffs. Fixed-rate tariffs guarantee the same price for energy over a set period—usually 12 to 24 months—ensuring your monthly bills remain predictable. This can provide peace of mind, especially when energy prices are volatile. For example, during the energy crisis of 2021, fixed-rate tariffs allowed consumers to avoid the dramatic price increases that affected those on variable rates. 

On the other hand, variable-rate tariffs change according to market conditions. They offer flexibility but come with the risk of price fluctuations, meaning your energy costs can rise during times of high demand or market instability. While you might benefit from lower prices when the market is stable, there’s a greater risk of paying more during price hikes. 

According to Ofgem, in April 2024 there were around 28 million households on standard variable tariffs protected by the cap and around 4 million households on fixed price tariffs.

Time-of-Use Tariffs 

Time-of-use (TOU) tariffs are a flexible pricing option offered by energy suppliers in the UK, where the price you pay for electricity varies depending on the time of day. With these tariffs, electricity is cheaper during off-peak hours, such as late at night, and more expensive during peak periods, like early evening when demand is highest. 

According to the UK government, if more people shifted their energy use to off-peak hours, the UK could unlock £1.2 billion in annual savings.

Green Energy Tariffs

A green energy tariff is designed to match the energy you purchase with renewable energy sources, helping reduce your environmental impact. Some green tariffs offer 100% renewable electricity, while others feature a mix of renewable and non-renewable energy. You can also find options like nuclear-free or carbon-offsetting green tariffs.

However, it’s important to note that the number of green energy tariffs has fallen by 91% in the last three years from 115 in 2021 to just 10 in 2024.

Best Energy Tariffs for Solar Panel Owners

If you own solar panels, choosing the right energy tariff can maximise your savings and earnings. The best tariffs for solar panel owners take into account factors like feed-in tariffs, export payments, and time-of-use rates. Here are the key types of tariffs to consider:

Export Tariffs (Smart Export Guarantee)

Many energy providers offer Smart Export Guarantee tariffs, which pay you for the surplus electricity you export to the grid. These rates vary by provider, so it’s essential to compare offers. Some of the best SEG rates come from:

British Gas’ Export and Earn Plus tariff pays 15.1p per kWh for the electricity you export to the grid. It’s a variable tariff and is exclusive to British Gas electricity customers. It has no exit fees and no fixed end date.

EDF’s Export tariff pays 15p per kWh for the electricity you export to the grid. It’s a 1-year fixed tariff, giving you price stability for 12 months, and there are no exit fees.

Time-of-Use Tariffs

Time-of-use tariffs offer cheaper electricity rates during off-peak hours, helping households save money by using energy when demand is low. These tariffs are particularly beneficial for solar panel owners who can store excess energy in a battery or shift their electricity usage to take advantage of lower rates.

One example is Agile Octopus from Octopus Energy, designed for tech-savvy users with smart meters who want to take advantage of real-time pricing. The rates update every 30 minutes, and during periods of low demand, prices can even go negative, meaning you get paid to use electricity. However, prices can also spike (up to 100p/kWh) during peak times, so users must be comfortable adjusting their energy usage throughout the day. 

Battery-Specific Tariffs

If you have a battery storage system, some energy suppliers offer tariffs designed to maximise savings and earnings by optimising when you store, use, and export energy.

For instance, Octopus Flux is a smart import and export tariff that optimises energy use. It offers cheap rates from 02:00 - 05:00 for charging your battery and higher rates from 16:00 - 19:00, making it the best time to discharge and export surplus electricity for maximum earnings.

How to Switch to a Better Energy Tariff

Switching to a better energy tariff can help you save money and get the best value for your energy needs. Here’s how to make the switch:

1. Review your current energy usage: Check how much energy you use, when you use it most, and whether you have solar panels or battery storage that could benefit from specific tariffs.
2. Compare tariffs: Use an online energy comparison tool to find the best rates based on your usage habits. Consider time-of-use tariffs, fixed-rate plans, and import/export tariffs if you generate your own energy.
3. Look for extra benefits: Some plans offer perks like cashback, smart meter installations, or green energy options. Factor these into your decision if they align with your priorities.
4. Check for exit fees and contract terms: Review your current contract for any exit fees or minimum terms. Look for a flexible plan with no hidden costs, especially if you're on a short-term or fixed contract.
5. Sign up with your new provider: Once you’ve chosen the best deal, sign up with your new provider. The switch usually takes 2-3 weeks, and they’ll handle most of the process.
6. Monitor your energy usage: Keep an eye on your bills and smart meter readings after switching to make sure you’re getting the expected savings. Adjust your usage if needed to maximise the benefits of your new tariff.

Maximising Savings with the Right Tariff

Maximising your savings with the right energy tariff comes down to selecting a plan that fits your energy usage and goals. Whether it’s taking advantage of lower off-peak rates, earning money from exporting excess solar energy, or reducing your environmental impact with a green tariff, the right choice can lead to significant savings. 

Carefully reviewing your energy consumption, comparing available tariffs, and switching to a plan that offers the best value ensures you get the most out of your energy usage while keeping costs in check.

About Upvolt

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Our team of highly skilled engineers uses premium-quality equipment to guarantee reliable performance, while our innovative Skygateâ„¢ platform provides intelligent energy optimisation for maximum efficiency.

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FAQ

What is the difference between fixed and variable rate energy tariffs? 

Fixed-rate tariffs offer a set price for energy over a fixed period, providing predictable bills. Variable-rate tariffs fluctuate based on market conditions, which can lead to lower prices when the market is stable, but higher costs when demand is high or the market is volatile.

How do time-of-use tariffs work? 

Time-of-use tariffs charge different rates depending on the time of day. Energy is typically cheaper during off-peak hours, such as late at night, and more expensive during peak periods, like early evening. This encourages users to shift their energy usage to cheaper times to save money.

What are green energy tariffs? 

Green energy tariffs are plans where the energy you purchase comes from renewable sources, such as wind or solar power. Some plans offer 100% renewable electricity, while others mix renewable and non-renewable energy. These tariffs help reduce your environmental impact.

How can solar panel owners benefit from specific energy tariffs? 

Solar panel owners can benefit from export tariffs, which pay for the surplus electricity they generate and send back to the grid. Battery-specific tariffs also help by offering cheaper rates to charge batteries during off-peak times and higher rates for exporting stored energy back to the grid.

What should I consider when switching energy providers? 

When switching energy providers, consider your energy consumption patterns, whether you have solar panels or battery storage, the tariffs available, and any exit fees or contract terms. Use online comparison tools to find the best deal for your needs.

Alex Lomax

CEO & Co-Founder

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