When it comes to choosing an energy supplier in the UK, you’ve probably heard the term “Big Six” thrown around. But what does it actually mean? These are the six major companies that have historically dominated the UK energy market, supplying millions of households with gas and electricity. For decades, they were the go-to providers for most homes, with little competition from smaller suppliers. Their dominance meant that switching suppliers wasn’t always at the forefront of people’s minds—after all, these were the most well-known and established names in the industry.
But times have changed. With the rise of renewable energy providers, price comparison tools, and government initiatives pushing for a greener future, the UK energy market has become much more competitive. More and more households are now looking beyond the Big Six, searching for better prices, improved customer service, and more environmentally friendly options. However, despite the growing number of alternative suppliers, the Big Six still hold a significant share of the market, and for many customers, they remain a reliable choice.
So, why do people still choose the Big Six? For some, it’s about brand recognition and trust—these companies have been around for years, and many households have been with them for decades. Others appreciate the range of tariffs and services that come with being a larger supplier, such as boiler cover, smart home solutions, and even rewards programs. And then there’s the matter of customer service—while experiences vary, many customers prefer dealing with well-established companies with dedicated support teams.
That being said, choosing the right supplier is no small decision. Energy costs make up a huge portion of your household expenses, and with fluctuating energy prices, it’s more important than ever to find a supplier that offers a good balance of affordability, reliability, and sustainability. So, who are the Big Six, and what do they bring to the table? More importantly, how do you know which one is right for you?
Let’s dive into the details of the Big Six energy suppliers in the UK, breaking down their services, pricing, customer experience, and green energy efforts, so you can make the best choice for your home.
1. British Gas
When it comes to energy suppliers in the UK, British Gas is the name that almost everyone recognizes. As the largest energy supplier in the country, British Gas has built a long-standing reputation for reliability, making it a household staple for millions of homes. With a history dating back to the early days of gas supply in the UK, it has become synonymous with home energy services, offering not just gas and electricity tariffs but also additional perks like boiler cover, home care services, and smart home solutions. However, while British Gas remains a dominant player, is it still the best choice for your home? That depends on what you’re looking for in an energy supplier.
British Gas provides a wide range of energy tariffs, catering to different customer needs. Whether you prefer fixed-rate plans for price security, variable tariffs for flexibility, or green energy options to reduce your carbon footprint, there’s likely a plan that suits your household. One of the standout features of British Gas is its HomeCare services, which include boiler maintenance, repairs, and emergency call-outs. This makes it an attractive choice for homeowners who want energy and home maintenance under one provider.
For those interested in smart technology, British Gas offers Hive smart thermostats and energy-efficient solutions that allow you to control your heating remotely. This can be a great way to manage your energy usage more effectively and lower your bills. However, while British Gas provides a wide array of services, its tariffs are not always the cheapest on the market. That’s why it’s important to compare rates before making a decision.
Who Should Consider British Gas?
British Gas is a solid choice if you value reliability, brand recognition, and 24/7 customer support. It’s particularly well-suited for households that want the added benefit of boiler and home care services, which can save you the hassle of dealing with multiple providers. However, if you’re looking for the cheapest energy tariffs or a provider that’s fully focused on renewable energy, you may find better alternatives elsewhere.
Before committing to British Gas, it’s worth using a comparison site like Docalla to see if you can get a better deal with another energy supplier. While British Gas remains a trusted name in the industry, the energy market is evolving, and there are now plenty of other suppliers that might offer lower prices, better customer service, or greener energy options.
2. EDF Energy
When it comes to energy suppliers that focus on low-carbon electricity, EDF Energy is one of the biggest names in the UK. As a subsidiary of the French state-owned Électricité de France (EDF), this company plays a massive role in the UK’s energy market, supplying millions of homes with gas and electricity. But what truly sets EDF apart from other energy suppliers is its heavy investment in nuclear power, making it one of the country’s largest producers of low-carbon electricity.
For customers who want a stable, long-term energy provider, EDF offers a strong mix of reliability, competitive pricing, and a commitment to reducing carbon emissions. But does that mean it’s the right energy supplier for you? Let’s take a closer look.
What EDF Energy Offers
EDF provides a variety of energy tariffs, giving you the flexibility to choose a plan that suits your needs. Among its most popular options are:
- Fixed-Rate Tariffs – Lock in a set price per unit of energy for a fixed period, protecting you from market fluctuations.
- Variable Tariffs – Prices change depending on market conditions, meaning you could save money when energy prices drop but pay more when they rise.
- Pay-As-You-Go (Prepayment) Plans – Ideal for customers who prefer to pay upfront and monitor their usage closely.
- Smart Meter Integration – EDF strongly encourages the use of smart meters, which help you track energy consumption in real time and manage your bills more effectively.
Another standout feature of EDF is its boiler cover and heating solutions, offering maintenance plans that can help keep your home’s heating system in check. While not as comprehensive as British Gas’s HomeCare service, it’s still a helpful option for those who want extra peace of mind.
Who Should Consider EDF Energy?
EDF Energy is a great option if you’re looking for a reliable, large-scale energy supplier with a strong focus on low-carbon electricity. If you support nuclear power as a cleaner alternative to fossil fuels, EDF is one of the best energy suppliers in the UK for that purpose. Additionally, its transparent pricing and billing system make it a solid choice for those who want predictable energy costs without hidden fees.
However, if your priority is supporting 100% renewable energy, such as wind and solar power, then other green energy suppliers may be a better fit. Before making a final decision, it’s always a good idea to compare tariffs and providers to ensure you’re getting the best deal for your energy needs. Comparing energy suppliers with Docalla is a good place to start.
3. E.ON UK
Over the past few years, E.ON UK has undergone a major transformation, positioning itself as one of the leading energy suppliers focused on renewable energy. Once a company that relied heavily on fossil fuels, E.ON has shifted gears and now provides 100% renewable electricity as standard for all customers. This makes it one of the most eco-friendly choices among the Big Six energy suppliers.
But what does that actually mean for you as a consumer? Is E.ON the right energy supplier for your home? Let’s break down everything you need to know.
What E.ON UK Offers
E.ON has tailored its services to cater to households that want a greener, more sustainable energy supply. Here’s what you can expect:
- 100% Renewable Electricity – Every electricity tariff from E.ON comes with power sourced entirely from renewable sources like wind and solar. This is great if you’re looking to reduce your carbon footprint.
- Smart Home Services – E.ON offers smart meters, smart thermostats, and even solar panel installations, allowing you to monitor and optimize your energy usage.
- EV Charging Solutions – As electric vehicles become more popular, E.ON provides home EV charging points, making it easier for you to transition to cleaner transport options.
- Fixed-Rate & Variable Tariffs – Whether you want price stability or the ability to take advantage of price drops, E.ON has different plans to suit your needs.
Who Should Consider E.ON UK?
If you’re committed to supporting renewable energy and want to power your home with 100% green electricity, E.ON is a top contender among the Big Six energy suppliers. Its focus on sustainability and energy efficiency makes it ideal for those looking to reduce their environmental impact.
However, if you’re looking for the cheapest energy tariffs, you may need to shop around, as E.ON’s prices are often higher than some competitors. Be sure to check if the long-term benefits of green energy outweigh the potential increase in costs for your household.
4. Scottish Power
If you’re looking for an energy supplier that is fully committed to wind power, ScottishPower should be on your radar. This Scottish-based supplier is unique among the Big Six because it generates all of its electricity from wind energy, making it one of the greenest choices on the market. ScottishPower stands out from the Big Six because it exclusively generates electricity from wind power. This makes it an excellent choice if you want 100% renewable energy from a UK-based provider.
The company has also been investing in onshore and offshore wind farms, helping to expand the UK’s capacity for clean energy production. Unlike some energy suppliers that still rely on gas or nuclear power, ScottishPower is entirely focused on wind energy, making it one of the greenest options available.
For those who want to support UK-based renewable energy projects, ScottishPower is a great option. But is it the right fit for your home? Here’s what you need to know.
What ScottishPower Offers
ScottishPower has a range of tariffs and services, catering to customers who want both green energy and home maintenance solutions. Some key features include:
- 100% Renewable Electricity – All of ScottishPower’s electricity comes from wind power, making it one of the only Big Six suppliers to run entirely on renewables.
- Fixed & Variable Tariffs – You can choose between a fixed-rate plan for price stability or a variable tariff that adjusts with market conditions.
- Smart Meter Installations – Like most modern suppliers, ScottishPower offers smart meters to help you track and manage your energy consumption.
- Boiler Care & Home Services – Similar to British Gas, ScottishPower provides boiler cover plans, which can be useful if you want extra peace of mind for your heating system.
Who Should Consider ScottishPower?
If you’re passionate about supporting wind energy and want to power your home with 100% renewable electricity, ScottishPower is an excellent choice. Its commitment to clean energy production makes it one of the most sustainable options among the Big Six energy suppliers.
However, before signing up, it’s a good idea to check customer service reviews and make sure you’re comfortable with their billing and support system. If customer service is a top priority for you, you might want to compare ScottishPower with other energy suppliers that have higher satisfaction ratings.
Ultimately, if your goal is to reduce your carbon footprint and support UK wind farms, ScottishPower is a fantastic option. Just be sure to weigh the pros and cons, especially when it comes to customer support and pricing structures.
5. SSE
SSE, once a standalone member of the Big Six energy suppliers, is now part of OVO Energy after a major acquisition. Despite the ownership change, SSE continues to operate under its original brand, maintaining a presence in the UK energy market. What sets SSE apart is its long-standing reputation for customer service and reliability, making it a solid choice for those who value stability and hassle-free energy supply.
Since OVO Energy is known for its commitment to renewable energy, SSE customers can expect a gradual shift towards green energy tariffs. While SSE traditionally relied on a mix of fossil fuels and renewables, its parent company is actively working to increase the proportion of green energy in its supply mix.
If you’re interested in reducing your carbon footprint, keep an eye on new sustainable tariffs that may become available through SSE. OVO Energy has already introduced carbon offsetting programs and EV charging solutions, which could eventually extend to SSE customers as well.
But how does SSE’s transition to OVO Energy impact its offerings? And is it still a strong competitor in today’s evolving energy landscape? Let’s take a closer look.
What SSE Offers
Even after becoming part of OVO Energy, SSE retains many of its original features while gradually aligning with OVO’s green energy focus. Here’s what you can expect:
- Standard & Fixed-Rate Tariffs – SSE continues to provide competitive energy tariffs, giving customers options to lock in prices for stability or opt for flexible plans.
- Smart Meters & Energy Management – SSE offers smart meter installations, helping customers monitor their energy consumption and reduce waste.
- Home Services & Boiler Cover – SSE has long been known for boiler servicing, heating cover, and home repair plans, offering added peace of mind for homeowners.
- Transition to Green Energy – Since OVO Energy is focused on sustainability, SSE customers can expect more renewable energy tariffs and green incentives in the future.
Who Should Consider SSE?
SSE is an excellent choice if customer service and reliability are your top priorities. If you value easy-to-understand tariffs, strong customer support, and home repair services, SSE remains one of the best options among the Big Six energy suppliers.
However, if you’re looking for an energy supplier that is already 100% renewable, you might want to explore options like E.ON UK or ScottishPower. While SSE is moving in a greener direction, it’s still in a transitional phase under OVO Energy’s leadership.
If you’re an existing SSE customer, it’s worth checking how the OVO Energy acquisition affects your tariff and whether you have access to new renewable energy options.
6. Npower
Npower was once a major player among the Big Six energy suppliers, providing gas and electricity to millions of UK households. However, following its acquisition by E.ON UK, Npower ceased operating as an independent brand. Today, all former Npower customers are now E.ON customers, and any new sign-ups go directly through E.ON.
This transition marked a significant shift in the UK’s energy supplier landscape, reducing the Big Six to just five independent brands. But what does this mean for former Npower customers, and how has the transition to E.ON affected service quality?
What Happened to Npower Customers?
If you were an Npower customer before the acquisition, your account, energy tariff, and services were transferred to E.ON UK. This means you now deal with E.ON’s customer service team and billing system, rather than Npower’s original setup.
While the transition aimed to be smooth, some customers initially reported issues with billing adjustments and account transfers. However, E.ON has worked to streamline the process, ensuring that all former Npower users receive the same level of service and tariff options as their existing customers.
What E.ON Offers for Former Npower Customers
Since Npower is now fully integrated into E.ON, former customers now have access to:
- 100% Renewable Electricity – E.ON has made a commitment to providing 100% green electricity across all its standard tariffs.
- Smart Meter Installations – Former Npower customers can benefit from E.ON’s smart energy solutions, including meters and usage tracking tools.
- Fixed & Variable Tariffs – E.ON provides a range of tariff options, allowing customers to choose between price stability or flexibility.
- Energy Efficiency Services – E.ON offers home efficiency upgrades, solar panel installations, and EV charging solutions to help customers reduce their energy bills and carbon footprint.
One of the biggest advantages of the E.ON acquisition is that former Npower customers now have access to 100% renewable electricity. Since E.ON has committed to sustainable energy, this means former Npower users have been automatically upgraded to greener energy solutions.
For customers who were looking for a more eco-friendly supplier, this transition has been a positive step. However, if you were used to Npower’s old tariffs and pricing structures, you may have noticed some changes.
Who Should Consider E.ON (for Former Npower Customers)?
If you were a Npower customer, you don’t have much of a choice now—your service has officially moved to E.ON UK. However, this may actually be a good thing if you were looking for:
- 100% renewable electricity
- A wider range of energy efficiency services
- Smart meter upgrades and home energy solutions
However, if you were satisfied with Npower’s original pricing and feel that your energy costs have risen under E.ON, it may be worth comparing alternative energy suppliers to find a better deal.
Ultimately, while Npower is no longer an independent supplier, its former customers now have access to a more sustainable energy provider under E.ON UK. If you want to stick with a Big Six supplier while embracing green energy, staying with E.ON might be a solid choice.
Final Thoughts
The Big Six still play a major role in the UK energy market, but they’re facing competition from newer, greener, and often cheaper suppliers. If you’re looking for reliability, brand recognition, and established customer service, they’re worth considering. However, always compare tariffs, customer service ratings, and green energy commitments before making a decision.
Want to find the best energy deal? Use Docalla to compare energy suppliers and switch to the best option for your home today!