Energy Suppliers - Full A-Z list

Energy suppliers play a critical role in delivering electricity and gas to consumers. Understanding the landscape of energy suppliers is essential when making informed decisions about your energy provider.

What happened to the "Big Six" energy suppliers?

Traditionally the UK energy market was dominated by the "Big Six" energy suppliers British Gas, E.ON, EDF Energy, Npower, ScottishPower and SSE. Today only four remain. These are:

  • British Gas
  • E.ON
  • EDF Energy
  • ScottishPower

In 2019 E.ON took over Npower as part of the acquisition of Innogy and customers were migrated to E.ON Next in 2020. SSE was taken over by OVO Energy in 2020, taking OVO Energy from a challenger brand to one of the biggest UK suppliers overnight.

Founded in 2015, Octopus Energy has grown rapidly to become one of the UK's largest suppliers through organic growth and increasing its customer base through the Supplier of Last Resort process (where Ofgem appoints a new energy provider to take on customers of a failed supplier). At the end of 2022 Octopus Energy took on 1.5m Bulb customers and is set to take on a further 1.3 million Shell customers by the end of 2023.

Independent Energy Suppliers

Independent energy suppliers, also known as challenger brands, are smaller companies that have entered the market to provide alternative options for consumers. These suppliers offer competitive pricing, innovative tariffs, and often specialize in renewable energy.

By expanding the choices available, independent suppliers have brought increased competition to the energy market and provided customers with more options to consider.

Renewable Energy Suppliers

Renewable energy suppliers focus on providing electricity generated from renewable sources such as wind, solar, hydro, or biomass. These suppliers prioritize sustainability and offer green energy tariffs to environmentally-conscious consumers.

By choosing renewable energy suppliers, customers can actively contribute to reducing their carbon footprint and supporting the transition to a greener and more sustainable energy sector.

Understanding the different types of energy suppliers available allows you to explore a range of options and consider factors such as pricing, customer service, and environmental impact when selecting the right supplier for your energy needs.

The Comprehensive Supplier Table

In order to assist you in evaluating and comparing energy suppliers, we have curated a comprehensive table featuring every energy supplier available in the UK. This table provides a convenient resource to help you make an informed decision based on your specific requirements and preferences.

Energy SupplierStatusNew SupplierNo. of Customers
Affect EnergyActive-22,000Compare Now >
AtlanticNo longer has customers on brand--Compare Now >
Avro EnergyCeased TradingOctopus Energy580,000Compare Now >
Better EnergyCeased TradingPFP Energy-Compare Now >
Bluegreen EnergyCeased TradingBritish Gas5,900Compare Now >
Boost EnergyActive-350,000Compare Now >
Breeze EnergyCeased TradingBritish Gas18,000Compare Now >
Brilliant EnergyCeased TradingSSE-Compare Now >
Bristol EnergyCeased TradingBritish Gas176,000Compare Now >
British GasActive-6,400,000Compare Now >
Bulb EnergyCeased TradingOctopus Energy1,500,000Compare Now >
Co-Operative EnergyActive-270,000Compare Now >
Colorado EnergyCeased TradingShell Energy15,000Compare Now >
DaligasCeased TradingShell Energy9,000Compare Now >
EActive--Compare Now >
E.ONActive-3,800,000Compare Now >
EBICoActive--Compare Now >
Economy EnergyCeased TradingOVO Energy-Compare Now >
EcotricityActive--Compare Now >
EDF EnergyActive-5,000,000Compare Now >
EngieCeased TradingOctopus Energy70,000Compare Now >
EnstrogaCeased TradingE.ON Next6,000Compare Now >
Entice EnergyCeased TradingScottish Power5,400Compare Now >
ESB EnergyCeased TradingSO Energy-Compare Now >
Eversmart EnergyCeased TradingUtilita29,000Compare Now >
Extra EnergyCeased TradingScottish Power108,000Compare Now >
first:utilityCeased TradingShell Energy-Compare Now >
Flow EnergyCeased TradingOctopus Energy-Compare Now >
Fuse EnergyActive-New SupplierCompare Now >
Future EnergyCeased TradingGreen Star Energy-Compare Now >
GB Energy SupplyCeased TradingCo-operative energy-Compare Now >
Gen4UCeased TradingOctopus Energy500Compare Now >
GnErgyCeased TradingBulb Energy9,000Compare Now >
Go Effortless EnergyCeased TradingOctopus Energy2,500Compare Now >
Good EnergyActive--Compare Now >
GoTo EnergyCeased TradingShell Energy22,000Compare Now >
GreenCeased TradingShell Energy255,000Compare Now >
100GreenActive--Compare Now >
Green Network EnergyCeased TradingEDF Energy360,000Compare Now >
Green Star EnergyCeased TradingShell Energy200,000Compare Now >
Hub EnergyCeased TradingE.ON Next6,000Compare Now >
Igloo EnergyCeased TradingE.ON Next179,000Compare Now >
IRESA LimitedCeased TradingOctopus Energy95,000Compare Now >
iSupplyCeased TradingEDF Energy190,000Compare Now >
M&S EnergyActive--Compare Now >
Neo EnergyCeased TradingOctopus Energy3,000Compare Now >
Neon ReefCeased TradingBritish Gas30,000Compare Now >
npowerCeased TradingE.ON Next6,500,000Compare Now >
npower SelectCeased TradingE.ON Next2,000,000Compare Now >
Octopus EnergyActive-1,400,000Compare Now >
Oink EnergyCeased TradingGreen Energy UK-Compare Now >
Omni EnergyCeased TradingUtilita6,000Compare Now >
One SelectCeased TradingTogether Energy36,000Compare Now >
Orbit EnergyCeased TradingScottish Power65,000Compare Now >
Our PowerCeased TradingUtilita31,000Compare Now >
Outfox the MarketActive--Compare Now >
Ovo EnergyActive-1,500,000Compare Now >
People's EnergyCeased TradingBritish Gas350,000Compare Now >
PFP EnergyCeased TradingBritish Gas82,000Compare Now >
PowershopCeased TradingE.ON Next-Compare Now >
Pure PlanetCeased TradingShell Energy235,000Compare Now >
Robin Hood EnergyCeased TradingBritish Gas112,000Compare Now >
Sainsbury's EnergyActive--Compare Now >
Scottish PowerActive-2,700,000Compare Now >
Shell EnergyActive-810,000Compare Now >
SimplicityCeased TradingBritish Gas50,000Compare Now >
So EnergyActive-200,000Compare Now >
SolarplicityCeased TradingEDF Energy7,500Compare Now >
Spark EnergyCeased TradingOVO Energy290,000Compare Now >
SSECeased TradingOVO Energy3,510,000Compare Now >
Southern ElectricCeased TradingOVO Energy-Compare Now >
Scottish HydroCeased TradingOVO Energy-Compare Now >
SwalecCeased TradingOVO Energy-Compare Now >
Symbio EnergyCeased TradingE.ON Next48,000Compare Now >
Telecom Utility WarehouseActive-540,000Compare Now >
Together EnergyCeased TradingBritish Gas176,000Compare Now >
TonikCeased TradingScottish Power130,000Compare Now >
TotoCeased TradingEDF Energy134,000Compare Now >
Tulo EnergyActive-New SupplierCompare Now >
Usio EnergyCeased TradingFirst Utility7,000Compare Now >
Utilita EnergyActive-800,000Compare Now >
Utility PointCeased TradingEDF Energy220,000Compare Now >
Yorkshire EnergyCeased TradingScottish Power74,000Compare Now >
Zebra PowerCeased TradingBritish Gas14,800Compare Now >
Zog EnergyCeased TradingEDF Energy11,700Compare Now >

Factors to Consider When Choosing an Energy Supplier

Choosing the right energy supplier is an important decision that can impact your energy costs, customer experience, and environmental footprint. When evaluating energy suppliers, consider the following factors:

Pricing Structure

Review the pricing options offered by different suppliers. Assess whether they provide fixed-rate tariffs, which offer stable pricing over a set period, or variable tariffs, which may fluctuate with market conditions. Compare prices and consider any discounts or incentives available for new customers.

Customer Service and Support

Customer service plays a crucial role in your overall experience with an energy supplier. Research their reputation for responsiveness, availability, and helpfulness. Look for reviews or ratings that reflect their commitment to resolving customer queries and concerns in a timely manner.

Renewable Energy Options

If sustainability is important to you, investigate the renewable energy options offered by each supplier. Some suppliers specialize in renewable energy and provide green energy tariffs sourced from renewable sources. Consider their commitment to reducing carbon emissions and supporting a cleaner energy future.

Contract Terms and Length

Examine the contract terms and length offered by different suppliers. Understand the duration of the contract and whether there are any exit fees or penalties for early termination. Ensure that the contract aligns with your desired flexibility and long-term plans.

Supplier Reputation and Stability

Research the reputation and stability of energy suppliers. Look for established suppliers with a track record of reliable service and financial stability. Consider their market presence, customer reviews, and any industry recognition they have received.

By considering these factors, you can make a more informed decision when choosing an energy supplier that meets your specific needs and preferences. Remember to prioritize the factors that matter most to you and select a supplier that aligns with your energy goals and values.

Comparison of Energy Suppliers

When selecting an energy supplier, it's important to compare and evaluate the different options available. Here is a detailed comparison of various energy suppliers, highlighting their key features, offerings, and customer benefits:

By examining this comparison, you can gain insights into the strengths and advantages of each energy supplier. Consider the following factors during your evaluation:

  • Pricing: Compare the tariffs and pricing structures offered by each supplier. Look for competitive rates, fixed or variable options, and any discounts or incentives available.
  • Customer Reviews: Read customer reviews and ratings to understand the level of customer satisfaction with each supplier's service, responsiveness, and support.
  • Renewable Energy Commitment: Evaluate the renewable energy options provided by suppliers that prioritize sustainable energy generation. Look for suppliers with a strong commitment to reducing carbon emissions.
  • Additional Services: Consider any extra services or benefits offered by energy suppliers, such as smart home solutions, energy-saving advice, or innovative technology integration.

Keep in mind that the right energy supplier for you depends on your individual needs, preferences, and priorities. Our energy comparison service serves as a guide to help you make an informed decision based on the factors that matter most to you.

Take the time to review and analyze the information provided in the comparison to find the energy supplier that aligns with your requirements. This will ensure you choose a supplier that offers competitive pricing, excellent customer service, and supports your energy goals.

Switching Energy Suppliers

If you're considering switching energy suppliers, it's essential to understand the process and the potential benefits it can offer. Here's a step-by-step guide to help you navigate the switch:

1. Compare Options

Start by comparing different energy suppliers using the comprehensive table provided earlier in this guide. Consider factors such as pricing, customer reviews, renewable energy options, and additional services. Identify the suppliers that align with your preferences and requirements.

2. Check Existing Contract Terms

Review your current energy contract to understand any terms, termination fees, or notice periods associated with switching suppliers. Make sure you are aware of any obligations or penalties before proceeding with the switch.

3. Contact New Supplier

Once you've chosen a new energy supplier, get in touch with them to initiate the switching process. Provide them with the necessary details and discuss the desired start date for your new contract.

4. Meter Readings

Provide meter readings to both your current and new supplier to ensure accurate billing during the transition. This will help avoid any discrepancies and ensure you are only charged for the energy consumed under each respective supplier.

5. Finalize the Switch

Confirm the switch with your new supplier and ensure that all the necessary paperwork is completed. They will coordinate with your previous supplier to make the transition as smooth as possible.

6. Review and Monitor

After the switch, carefully review your new contract terms, payment details, and any changes to your billing process. Monitor your energy usage and bills to ensure they align with your expectations and address any discrepancies promptly.

Switching energy suppliers can potentially lead to cost savings, better customer service, and access to renewable energy options. However, it's crucial to carefully assess your current contract and consider any fees or obligations associated with the switch. By following these steps and staying informed throughout the process, you can make a successful transition to a new energy supplier that better suits your needs.

Renewable Energy Suppliers

Renewable energy suppliers are playing a pivotal role in the transition to a more sustainable and greener energy future. By choosing a renewable energy supplier, you can actively contribute to reducing carbon emissions and supporting the growth of renewable energy generation. Here's what you need to know about renewable energy suppliers:

Commitment to Sustainable Energy

Renewable energy suppliers prioritize sustainable energy generation by harnessing sources such as wind, solar, hydro, or biomass. They strive to reduce reliance on fossil fuels and minimize the environmental impact of energy production.

Green Energy Tariffs

Renewable energy suppliers offer green energy tariffs, allowing customers to power their homes or businesses with electricity generated from renewable sources. These tariffs often come with a clear indication of the percentage of renewable energy used and its environmental benefits.

Environmental Impact

By choosing a renewable energy supplier, you actively contribute to reducing carbon emissions and supporting the shift to cleaner energy sources. Renewable energy generation significantly reduces greenhouse gas emissions compared to traditional fossil fuel-based energy production.

Supporting the Energy Transition

Renewable energy suppliers are at the forefront of the energy transition, driving innovation and investment in renewable technologies. By choosing their services, you support the growth and development of renewable energy infrastructure, helping to create a more sustainable energy sector.

When considering renewable energy suppliers, evaluate their green energy tariffs, environmental commitments, and the sources of renewable energy they utilize. Look for certifications or accreditations that demonstrate their adherence to sustainable practices.

By selecting a renewable energy supplier, you align your energy consumption with your values and contribute to building a more sustainable future. Take the opportunity to choose a supplier that supports renewable energy generation and helps combat climate change.

Customer Support and Complaint Handling

When selecting an energy supplier, it's essential to consider the quality of their customer support and their approach to handling complaints. Here are key aspects to keep in mind:

Responsiveness and Availability

Evaluate the responsiveness and availability of customer support channels offered by energy suppliers. Look for suppliers that provide multiple channels such as phone, email, and online chat to address customer queries and concerns promptly.

Communication and Transparency

Consider the clarity and transparency of communication from energy suppliers. Assess whether they provide clear information about billing, tariffs, contract terms, and any changes in services. Transparency helps you understand your energy usage and billing, reducing confusion or unexpected surprises.

Complaint Handling Procedures

Research how energy suppliers handle customer complaints. Look for suppliers that have well-defined and efficient procedures for addressing and resolving customer issues. Check for reviews or ratings that reflect their ability to handle complaints in a timely and satisfactory manner.

Online Account Management

Examine the availability and functionality of online account management systems. These systems allow you to conveniently access and manage your energy account, view bills, monitor usage, and make payments online.

Customer Reviews and Ratings

Take the time to read customer reviews and ratings of energy suppliers. This can provide insights into the overall customer experience, including satisfaction levels, ease of communication, complaint resolution, and overall service quality.

Prioritizing excellent customer support ensures a positive experience throughout your relationship with an energy supplier. Research and consider customer support and complaint handling as essential factors when making your decision.

By selecting an energy supplier with strong customer support, you can feel confident that your queries will be promptly addressed, and any concerns will be resolved efficiently. Excellent customer support contributes to a smooth and satisfying experience with your energy supplier.


Choosing the right energy supplier is a decision that impacts your energy costs, customer experience, and environmental footprint. By considering various factors such as pricing, customer support, renewable energy options, and complaint handling, you can make an informed choice that aligns with your needs and values.

Throughout this guide, we have explored the world of energy suppliers, providing you with valuable insights and guidance. We presented a comprehensive table featuring every energy supplier in the UK, allowing you to compare and evaluate their offerings conveniently.

Remember, the best energy supplier for you depends on your individual preferences and requirements. Some may prioritize competitive pricing, while others may focus on renewable energy options or exceptional customer service. Take advantage of the resources and information provided in this guide to select the energy supplier that meets your specific needs.

As the energy market continues to evolve, stay informed about emerging trends and advancements in the industry. Keep track of new technologies, green initiatives, and innovative services that can enhance your energy experience.

Our energy expert

Compare. Switch. Save. Join millions of homes switching with the UK energy experts.

You may also be interested in:

Ofgem Confidence Code
Fully accredited by Ofgem since 2003