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What is renewable energy?

Renewable energy, also known as green energy, is powered by natural sources that are not depleted when used – such as solar, tidal or wind. Because it doesn’t involve burning fossil fuels, renewable energy is cleaner, more sustainable and better for the environment.

The energy that’s piped or wired into our homes all comes via the National Grid – so it’s hard to say whether your supply originates from a renewable or non-renewable source.

However, there are several renewable energy providers which specialise in generating or buying energy from renewable sources.

If you’re interested in switching to renewable energy, you can look for a ‘green’ tariff or a ‘green supply tariff’. This refers to green energy suppliers’ products that match your energy usage by giving back an equivalent in renewable energy to the National Grid.

Why should I choose green energy?

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Hidden cost of fossil fuels

Energy produced by burning fossil fuels, sometimes referred to as ‘brown energy’, releases carbon dioxide into the atmosphere, contributing to global warming. With climate change increasingly important to environmentally conscious consumers, many people are considering how they can limit their carbon footprint.

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Home energy choices make a difference

According to government figures, 26% of UK emissions come from households. This includes emissions from heating – excluding electricity – and from travel. So ‘going green’ with your energy could help make an impact. 

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Help clean up the grid

By choosing one of the green energy companies, you’re choosing to support investment in renewable energy and help decarbonise the National Grid.

It's worth noting that many mainstream energy providers now offer green tariffs. Although they may still rely on ‘brown’ energy to some extent, they may source some of their energy from renewables, support environmental projects or fund other carbon-offset schemes.

How do I know if an energy provider is green?

There’s been some press coverage about green energy providers and green tariffs not always being exactly what they seem.

That’s because, due to a regulatory loophole, the certificates that prove energy is from a renewable source – called Renewable Energy Guarantees of Origin (REGOs) – can be bought separately from the energy itself.

Critics say that this enables energy providers to ‘greenwash’ just how renewable the energy they buy is.

If supporting the switch to greener energy is important to you, it’s worth digging a little to see how renewable energy companies are truly sourcing their power. You can be more confident in an energy provider’s green credentials if it’s:

  • Generating its own renewable electricity or green gas

  • Investing its profits in renewable power generation

  • Buying renewable power directly from UK generators.

How do I switch to a renewable energy company?

The process of switching your energy provider is much the same whether you’re looking to lower your footprint or just want to switch to a cheaper tariff. Here’s how to switch to a green tariff when you compare with us:

1.

Tell us where you live

Enter your postcode so we can find tariffs that are available in your area. We’ll automatically look up your current tariff to help you see if you could save by switching your energy provider.

2.

Compare green energy tariffs

You can filter your results to show green tariffs. Check the details and cost of each, including the tariff term and any exit fees, to make an informed decision.

3.

Your new provider will sort the switch

Choose the green tariff you want to switch to, and we’ll send you over to start your application. Your new provider will walk you through the switch process and notify your old provider.

How is green energy created?

There are a few different ways renewable energy is generated:

Wind energy

Electricity is produced by wind turbines, either on the land or at sea. Wind power is the largest component of renewable electricity in the UK. According to the BBC, wind power accounted for more than 50% of all Great Britain’s electricity generation during a period of around ten days in December 2024.

Solar power

Photovoltaic (PV) panels convert sunlight into electricity. They can be installed on individual homes to help generate electricity, and any extra solar energy can be sold back into the grid.

Tidal power

Electricity is generated by harnessing the energy of the tides to move barrages and turbines.

Hydropower

Uses the movement of flowing or falling water via turbines to turn a generator and produce electricity.

Geothermal power

Harnesses the heat and energy stored in the earth’s crust to either directly heat homes, or to generate electricity in geothermal power plants. Ground source heat pumps are one geothermal method that can be used to heat homes.

Biomass energy

Electricity can be produced when organic matter, such as plants, food waste or timber is burned. Although this process produces fossil fuels, it’s considered a renewable source because the plants burned can be regrown and they absorb carbon during their lifetime.

Biomass can also be turned into methane – or so-called ‘green gas’ – through a process called anaerobic digestion.

Which are the best renewable energy companies in the UK?

The best renewable energy provider for you and your home can depend on several factors. When comparing renewable energy providers and green tariffs, you’ll need to bear in mind:

  • What’s available in your area

  • Your energy needs and whether you use gas as well as electricity

  • If you want a tariff that’s 100% renewable or you’re more flexible

  • If you want to invest in generating your own renewable energy

  • If you want a fixed term or a variable rate

  • What your budget is.

There are a handful green energy suppliers which specialise in renewable energy, including:

  • SO Energy

  • Octopus Energy

  • Ecotricity

  • Good Energy.

However, there are also plenty of mainstream energy providers offering green tariffs, including well-known names such as:

  • British Gas

  • E.ON Next

  • Ovo Energy

  • EDF

  • Scottish Power.

What are the pros and cons of choosing renewable energy providers?

Here are some benefits and drawbacks to weigh up when deciding if you’re ready to make the switch to a renewable energy provider.

Pros of green energy providers

  • Lower your carbon footprint and support the UK’s transition to sustainable energy.

  • Green tariffs are increasingly available, meaning more choice and more competitive prices.

  • Transparency around fuel mix means you can see which providers are the greenest.

Cons of green energy providers

  • You may end up paying more for your energy bills for a green tariff than a standard fixed-rate tariff.

  • Green gas is not as readily available – some renewable energy providers do offer green gas tariffs, but others may offset the carbon emissions their gas emits.

  • Some green energy companies have been accused of ‘greenwashing’, so you may have to do some research to make sure a tariff is as green as it claims to be.

Are green energy tariffs cheaper?

Green energy tariffs can be more expensive than standard energy because of the increased operating costs to supply green energy.

A handful of green energy providers are not subject to Ofgem’s energy price cap, because of the investment they are making to support the UK’s net zero transition.

The good news is that green tariffs are becoming more competitively priced as the choice of deals grows.

It’s always worth comparing traditional and renewable energy suppliers with Compare the Market to search for cheap renewable energy. In the end, it may not come down to cost but, rather, your energy preferences.

If you install renewable technology in your home, you might also be able to benefit from government schemes that promote the use of green energy.

How do I compare green energy suppliers?

We’ll include green tariffs when you complete a quote through Compare the Market. They’ll be shown alongside all the other tariffs in your results – so you don’t have to specifically ‘go green’ to compare renewable energy quotes. 

To help you run a green energy comparison, you’ll also be able to read about the supplier and its energy features, to compare how green it is. Simply click on ‘more details’, on each recommended tariff. 

Some renewable energy providers can offer up to 100% green energy. If a provider offers a mix of energy (some renewable and the rest from traditional sources), it must be upfront about the percentage mix so you know exactly what you’re getting.

It’s important to have a good read through any T&Cs before you go ahead and make a switch, just so you can be sure you’re getting the right green energy type for your needs.

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Dan Tremain

What our expert says...

“Don’t assume a tariff is green just because it’s being offered by a supplier with an eco-friendly-sounding name, as they might also offer non-renewable tariffs. When making a comparison, look out for terms like ‘renewable electricity’, ‘renewable gas’ and ‘carbon offset’.”

FAQs

How can I generate my own renewable energy?

‘Homemade’ green energy is becoming more and more accessible. Ways to do it include:

  • Solar photovoltaic (solar PV) – these panels harvest the sun’s energy and convert it into electricity you can use at home.

  • Solar thermal – these panels take the sun’s energy and use it to heat your water through coils that feed into your water cylinder.

  • Wind turbines – you can use these to generate your own power when there’s enough of a breeze.

  • Air source heat pumps and ground source heat pumps – use heat from the outside air or from the ground, respectively, to heat your home.

For more information on generating your own green energy, head to the Energy Saving Trust website.

Will making my own energy save me money?

Generating your own energy could potentially save you money in the long run. Although there’s typically a fairly large initial cost for installing energy-generating technology, there are long-term savings to be had. 

Firstly, you’ll save money on your bills because you’ll be making your own power. Plus, you could receive payments for any excess renewable electricity you generate and export to the grid, through the Government’s Smart Export Guarantee scheme.

What’s a feed-in tariff (FIT)?

The government’s feed-in tariff scheme gave households and businesses the opportunity to earn money back on the energy they generated, as well as selling any excess energy to the National Grid. However, the scheme closed to new applicants in March 2019.

It’s been succeeded by the Smart Export Guarantee (SEG). Introduced at the start of 2020, this works in a similar way to the FIT scheme by offering payments to households who generate their own energy through solar, wind, water, micro-combined heat and power, and anaerobic digestion (a type of bioenergy that turns plant material into gas).

If you already receive a feed-in tariff on your installation, this won’t be affected by the SEG.

Learn more about generating your own solar energy in our guide to solar power.

If I switch energy supplier, what will happen to my feed-in tariff?

Switching energy suppliers doesn’t mean anything has to change regarding your feed-in-tariff. 

Your electricity supplier doesn’t have to be the same as the one that pays you under the FIT scheme. You can keep the two separate. So, there’s nothing to stop you searching for a better deal on your energy and keeping your FIT agreement as it is.

Alternatively, you can switch your FIT agreement as well. This won’t affect the amount of money you get, as this is set by Ofgem. Just make sure, before you switch, that your new provider is happy to make the payments to you.

Can I get green energy if I have a prepayment meter?

Yes, if you have a prepaid meter installed in your home you can still be environmentally friendly.

You can compare green prepayment tariffs and potentially switch to a cheaper prepayment deal, although you’ll probably find there’s less choice available. You’ll get more options if you can move to a standard credit meter.

Can I charge my electric car with green energy?

If you have solar panels installed on the roof of your home, it’s possible to use the renewable energy they generate to charge your electric car. Doing this can help you save money on battery charging costs while further reducing your carbon footprint.

Alternatively, if you don’t want to invest in solar panels, you could search for a green energy tariff. Some green tariffs include cheap rates at off-peak hours, meaning you could charge your electric car overnight and save on your bills.

Dan Tremain
Reviewed 28 Jul 2026 by Dan Tremain Energy and business energy expert

Dan is focused on helping people and businesses get the right deal for their energy in a volatile market. For more than 20 years, he has been introducing, developing and managing product propositions across a variety of industries, including energy, insurance and banking, all to get the right outcome for customers. 

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1 Based on Trustpilot ratings (July 2026).