The Best Business Energy Suppliers in the UK 2023

We know business leaders have never been under more pressure to bring their energy bills down. That's why we've put together this comparison guide to the best energy companies in the UK.

During our research into energy, we obtained sample quotes, examined green energy options, and looked at customer support options. All in the name of helping your business get the best possible gas and electricity deal.

Octopus Energy is the best energy supplier, according to our criteria. In second place is E.ON Next, with British Gas Lite coming in third.

Remember – unlike domestic contracts – businesses are able to negotiate energy rates. Don’t be afraid to shop around, because the last six months of your contract is your opportunity to switch to a better deal.

If you use our business energy quote request form, we'll get you personalised energy price quotes from smaller energy providers. All you need to do is give us your contact details and we'll only share them with trusted energy brokers. You'll get a call back within a day to discuss your tariff options.

The Big Six energy suppliers

These are the biggest business energy suppliers (the ‘Big Six') in the UK, ranked in order of our latest research scores:

1. Octopus Energy – challenger to the traditional Big Six
2. E.ON (owns nPower)
3. British Gas
4. ScottishPower
5. EDF Energy
6. SSE (sold its domestic energy arm to OVO)

We believe these are the best energy suppliers for SMBs because they offer the cheapest tariffs. Here's an easy comparison chart that summarises our research from spring 2023:

UK energy supply has seen big changes over the past four years: E.ON bought nPower in 2019, and the brand now only supplies energy to large businesses. SSE's business energy arm split from its retail business (which was sold to OVO in 2020), and is now known as SSE Energy Solutions.

This made room for a new contender; Octopus Energy isn't nearly as profitable as its rival energy companies, though its investment in customer service and renewable energy challenges industry standards. So far, no other energy company comes close to Octopus Energy's high customer satisfaction scores.

Scroll down to get an overview of each energy supplier, its pros and cons, plus an in-depth evaluation of its customer service, renewable energy, and pricing.

Why is business electricity so expensive?

You'll no doubt have noticed the steep rise in gas and electricity prices lately. Businesses have been squeezed harder by the rollback of government energy bill support (known as the Energy Bill Relief Scheme) as of 1 April 2023. Figures from the National Federation of Self Employed and Small Businesses show a typical UK pub may face energy bills three times higher. The same report anticipates 370,000 small businesses may have to downsize, restructure or shut down altogether due to higher energy bills.

Wholesale electricity and gas prices increased drastically between summer 2021 and winter 2022. A flurry of minor catastrophes fed into this, including:

• Increased demand from industries such as hospitality starting up again after COVID
• A shortage of wind-generated energy owing to weather conditions in summer
• A fire at the IFA1 interconnector interrupting electricity supply from France
• Russian invasion of Ukraine causing several countries to stop buying its gas

Energy resources were therefore under a lot of pressure, and suppliers passed the ensuing costs onto customers. While regular household customers are protected by a price cap known as the Energy Price Guarantee (EPG), businesses aren't. After the Energy Bill Relief Scheme (October 2022 to March 2023) came to an end, the Energy Bills Discount Scheme (April 2023) provided just a fraction of protection from high energy prices.

How to choose between energy suppliers

These changes mean a slight boost in the number of choices you have. Yet only 64% of customers are satisfied with the ease of comparing energy suppliers.

Honestly, it's a seriously complicated time to plan your energy budget, but we're here to help make things as clear as possible. With your small business in mind, we've compared the Big Six on criteria that matter most:

• Prices (‘out of contract’ rates versus a sample fixed-term contract quote)
• Review ratings
• Customer support options
• Whether they sell renewable energy

It’s worth mentioning that the ‘out-of-contract’ rates are the most expensive, and it's the price you pay for being disorganised. You will get the best rates if you commit to a fixed contract with a provider. It’s therefore really important to get quotes tailored to your business, so you can compare prices effectively.

Customer service is the main source of complaints for energy customers, which is the same for the top leased line providers. SSE Energy Solutions has the angriest online reviews, scoring just 1.2/5 overall on Trustpilot. E.ON has a respectable 4.2/5, and Octopus Energy has a smashing 4.8/5.

What to know about our business energy pricing

We can't give all types of pricing for every type of business, so we've put together a set of options to represent a typical UK SMB. That way, the energy quotes in this article are for one particular business. Your individual quote will vary.

We've made the following assumptions for the purposes of our research:

• Small restaurant based in Leeds town centre
• Electricity use per year: 20,000 kWh
• Gas use per year: 30,000 kWh
• Standard electricity meter (not a top-up one)
• New one-year contract to start in March 2023
• Paying by monthly direct debit

We got the price quotes from auto-generators on the suppliers' websites. Sometimes quotes are not available online, for example, because the supplier tool can't work out the meter point based on a given address.

Not all energy companies supply all meter types – Octopus Energy has paused new half-hourly meter customers “due to the current record energy prices and unpredictable wholesale market”.

How does energy pricing work?

There are two charges for each “fuel” type: electricity and gas. There's a unit charge that appears on your bill according to how much energy you use. Then there's the daily (or “standing”) charge, a flat rate you pay every day of your contract. That means you'll pay it even on days you use no energy at all.

Another things to note about pricing is that if you choose a fixed rate tariff, you have the certainty of knowing your bill for the year. Most suppliers will charge you monthly, and you'll get a roughly 7% discount for paying by direct debit. Octopus Energy will charge you the entire contract fee, upfront, however. They do this to offer you their best price, but it's worth bearing in mind if your business is not cash-rich at the time of starting a new energy contract.

Alternatively, you can choose a flexible (or variable) rate tariff. This means you'll get a lower price, but it's not guaranteed to stay that way. Instead, your energy rates will chop and change roughly in line with wholesale prices, which have been very changeable since the start of 2021.

Remember, energy rates vary according to:

• Your local region
• The date you request a quote
• What's happening in the energy market
• Your choice of supplier
• Government taxes
• The type of meter you have
• The tariff type you choose
• The amount of energy you use
• The type of business you are (this affects VAT)
• Whether you go direct or through a partner

When you sign up with an energy supplier, you'll go through a credit check. If you're worried your business accounts aren't in good shape, then you may wish to stay with your current supplier instead of switching. Reason being, an energy firm is likely to charge you more if your business is deemed at high risk of not paying.

We understand it's a scary time to be thinking about bills, so we've put together an easy guide on how to save money on your business energy bills. Arming yourself with practical information is the best way forward in uncertain economic times.

Next, let's take a look at individual energy companies in more detail.

1. Octopus Energy: Best overall

Octopus Energy customer service

Octopus Energy is the highest rated major energy company with a smashing 4.8/5 on Trustpilot. The next highest rated were E.ON Next and EDF Energy at 4.2/5. Quick responses and multiple ways to contact your energy supplier are vital for reducing stress on busy business owners. We'd recommend Octopus Energy to anyone who's struggled with poor customer support from past providers.

Customer support isn't 24/7, but there's a phone line open 9am-5pm Monday to Thursday and 9am-4pm on Fridays. If you need support on weekends, there's an email inbox that's monitored seven days a week.

Octopus Energy and E.ON Next were the only two providers to publicise sign language video chat support for customers. That's setting a great example for customer accessibility. There's no webchat function (EDF Energy, British Gas Lite, and ScottishPower all have one) but Octopus Energy is active on Facebook and Twitter.

Octopus renewable energy

Octopus Energy owns and operates renewable energy sources to power two million UK homes. It won the Association for Renewable Energy and Clean Technology's company of the year prize in 2019 and 2020. All of its energy supplied is matched by renewable energy.

If you want to get cheaper energy on windy days, you can ask Octopus Energy to help you lobby for a wind turbine on your land. You can also profit from the green energy sold back to the grid, depending on the success of the project.

Octopus Energy pricing

We got quotes for both gas and electricity fixed rate tariffs for our chosen Leeds restaurant. The electricity quote was the second cheapest (above British Gas Lite) and the gas price was the cheapest (although we couldn't get gas quotes from ScottishPower or SSE). This is even more impressive given the supply is backed by renewable energy at no extra cost. By comparison, you'd have to pay extra with ScottishPower or British gas Lite to pay for renewable electricity.

2. E.ON: Best range of customer support options

E.ON Next customer service

E.ON Next has the most customer service channels of any of the Big Six suppliers, including a WhatsApp service 8am-10pm, seven days a week. Phone service is comprehensive, with an out of hours available once the main line is closed. That means you can speak to a human staff person no matter what time you need one. That's unique to E.ON – British Gas Lite and EDF Energy don't offer their online business customers any phone support.

E.ON Next scores a good 4.2/5 on Trustpilot, which is exactly equal to EDF Energy but higher than British Gas Lite, SSE or ScottishPower.

Another unique bonus is the 16,000-member-strong E.ON Next community forum where customers and E.ON staff troubleshoot issues together. This is useful for discussing news such as the April 2023 Ofgem Energy Price Cap, as well as airing grievances, and seeking advice. We didn't find a resource like this from any of the other Big Six suppliers.

E.ON renewable energy

There's at least some small effort from E.ON to reduce its environmental impact; E.ON has decided to link a quarter of its board members' bonuses to “reflect the degree to which the company achieves its sustainability targets”.

But the company's central claim of “100% renewable backed electricity” is certainly appealing for businesses trying to operate sustainably. This doesn't mean E.ON can guarantee that all of the electricity supplied to your business will be from a renewable source. But it means E.ON pays for the generation of energy from renewable sources in a way that mirrors its customers' energy use.

Overall, E.ON's fuel mix for 1 April 2021 to 31 March 2022 is 80.3% renewable, which is far higher than British Gas (48%) or SSE (46%).

E.ON Next pricing

E.ON Next couldn't offer us a fixed rate business tariff online. Instead, we were offered a flexible tariff. This makes it hard to compare pricing to other energy suppliers, as flexible rates are, of course, highly likely to change over time.

However, our quote for E.ON Next Flex, the standard variable product, for our Leeds restaurant was cheaper overall than SSE – Choice and the British Gas Lite variable price plan rates. But it's important to note that there's no guarantee this will be the same when your business gets a quote. So you should compare a range of offers from energy suppliers before making a decision.

It took us a lot of searching to find E.ON Next's deemed pricing – that's the price you pay if you don't agree a specific contract. This was competitive (cheaper) compared to British Gas Lite and EDF Energy.

3. British Gas: Best electricity price

British Gas Lite customer service

The fact is, customer service costs companies a lot of time and money. British Gas Lite is no exception when it comes to looking for efficiencies, so the firm has taken the decision to limit their resources in this area. The energy company frames this as the best way to offer you their best energy tariffs – which is technically true. But with a very OK score of 3/5 on Trustpilot for British Gas Lite, it seems some SMB customers would prefer more channels of communication.

There's no phone support unless you're a premium business customer. Not to mention the webchat currently shuts down on Mondays between 3pm and 5pm so agents can catch up on current support requests.

Still, at least British Gas Lite has a webchat – SSE Energy Solutions doesn't. But there's no email support at all – unlike Octopus Energy, E.ON, ScottishPower, and SSE.

British Gas renewable energy

Unlike E.ON and Octopus Energy, British Gas charges a premium for gas and electricity from renewable sources. In terms of its average fuel mix across all tariffs, 48% is from renewable energy sources. That's brought up significantly by British Gas' green tariffs (its other tariffs are just 24% renewably sourced). So if sustainability is a priority for your company, you should be prepared to pay extra if you want to go with British Gas.

British Gas Lite pricing

Like all business energy suppliers, British Gas Lite offers wildly different tariffs depending on the terms of your contract. If you take over a business and find the premises is already signed up with British Gas, you should negotiate a fixed term contract as quickly as possible. Or switch to another supplier.

Yes, it can be a little confusing to try and navigate the different rates. We found two different sets of renewal rates for existing business customers on British Gas websites. But we're choosing not to take the “Gas Lite” part of its name seriously… How much will your energy from British Gas cost? There's no blanket answer; your specific business will get an individual quote.

4. ScottishPower: Best for clear pricing

ScottishPower customer service

The advantage of ScottishPower overall is a decent level of customer service for a mid-range price. If we're being picky, we'd say 3.2/5 on Trustpilot doesn't signal the best customer satisfaction; it's lower than Octopus Energy, E.ON Next and EDF Energy.

There are the expected number of customer support options available, including a phone line open Monday to Friday 9am until 5pm. There's an email address as well – which British Gas Lite and EDF Energy don't provide. We noticed ScottishPower's Facebook and Twitter accounts haven't been active since December 2022, so don't hold your breath for a reply on there.

The most convenient feature is the customer support webchat available on web browser or mobile app. The only hitch is that it froze when we tried to use it – suddenly not allowing us to click anywhere. It became useless at that point. Hopefully you'll have better luck if you ever need it yourself.

ScottishPower renewable energy

You won't be offered renewable energy as standard with ScottishPower, unlike with E.ON Next and Octopus Energy. But admittedly our quote for a fixed rate renewable energy plan (£7,333.08 electricity only, annual total) was only very slightly more expensive than the non-renewable fixed rate plan (£7,153.08).

But we know every penny counts in this economy, so unless using green energy is at the heart of your business, we can understand why the extra £200 won't seem worth it.

At the end of 2022, 66% of energy generation technologies installed by Iberdrola Group (ScottishPower's parent company) were renewable. This includes wind, hydro, solar, and others. Nuclear made up 5.2%.

ScottishPower pricing

Overall, ScottishPower is fairly priced for the level of customer support and environmental care you can expect. Our fixed contract quote came out middle-of-the-road compared with the other Big Six suppliers.

We were pleased to see a range of tariffs offered, depending on the length of contract we wanted, and whether or not we prioritised green fuel sources. This was more convenient than E.ON Next, whose online tool only provided us with one (variable) tariff option.

However, we couldn't get a gas price quote as the online tool couldn't track down our gas point. This was also the case for SSE, but Octopus Energy, E.ON Next and British Gas Lite were still able to offer us fixed contract gas quotes.

5. EDF Energy: Mid-market option

EDF Energy customer service

Like many other energy companies right now, the phone lines of EDF Energy are very busy. However, the opening hours of the call centre (Monday to Thursday 9am-6pm and Friday 9am-5pm) are better than most other suppliers, even Octopus Energy. That extra hour after 5pm gives you a chance to get through to a human assistant after close of business. Much-needed for shop owners and managers of beauty salons, maintenance companies, workshops, and the like.

Most customers are pretty pleased with EDF Energy customer service, judging by its 4.2/5 Trustpilot rating.

There's even webchat for EDF business customers to ask questions and get help on account issues. When we tried it at midday on a Tuesday in February 2023 we had to wait nine minutes to get connected. We did notice there was no email support from EDF Energy, which E.ON, Octopus Energy, and all ScottishPower offer.

EDF Energy renewable energy

Despite branding itself as a leading renewable energy provider, the fuel mix for its non renewable tariffs and products contain 40.5% gas and 4.4% coal. These are slightly above UK averages. EDF Energy's cheapest business tariffs – like the one we got a quote for: Fixed for business online – are examples of its non renewable tariffs.

In total, EDF's fuel mix (April 2021 to March 2022) is just 19% renewable and 63.1% nuclear. By comparison, the E.ON Next fuel mix for the same period is 80.3% renewable and 1.4% nuclear.

EDF Energy pricing

When you get a price quote online, you'll get the lowest possible price: the “Fixed for Business Online Tariff” from EDF Energy. However, this option comes without phone support which means you'll have to rely on webchat or social media if you need extra help. As with most fixed contracts, there's an exit fee if you decide to leave early.

If you want to avoid exit fees, you can choose a “Freedom for Business Tariff” which you can cut off at any time. Prices for your gas and electricity will vary, so it will be hard to know exactly what your monthly bills will be. But if wholesale prices fall, and EDF Energy chooses to pass that saving onto customers then you'll save more money this way.

6. SSE Energy Solutions: Best environmental investment

SSE Energy Solutions customer service

SSE supplies a webform for business customers to submit questions, and its phone line is available Monday to Friday 8.30am-5.00pm.

But the reviews are bad. Really bad. It's a cringeworthy 1.2/5 on Trustpilot for SSE Energy Solutions, the business energy arm of SSE Group. Problems mentioned include billing issues and a long wait for phone support. These issues aren't universal across energy suppliers – the next lowest Trustpilot score is British Gas Lite at 3/5.

In our view, poor customer service is pretty unforgiveable. The energy crisis in the wake of the Ukraine war poses so much uncertainty for small business owners. Wholesale prices are so changeable that clear advice and support is a must. For that reason, we wouldn't blame you for going elsewhere this time around.

SSE renewable energy

SSE generates renewable energy through wind farms and hydro plants, and it's currently a major source of funding for the 277-turbine Dogger Bank Wind Farm project. This will provide energy for six million UK homes, and is set for completion in 2026. That's a big check mark in the box for active investment in sustainable energy sourcing.

All SSE SMB fixed price plans include renewable electricity as standard – the same goes for E.ON Next but not for British Gas. SSE renewable gas is an optional extra you'll have to pay a bit more for.

Overall, SSE Energy Solutions' fuel mix is 46% renewable. That's higher than EDF but much lower than E.ON. It's pretty much on par with British Gas (48%).

SSE Energy Solutions pricing

We were able to get two quotes for electricity to a Leeds restaurant:

We can’t stress enough that the out of contract tariffs are the worst rates you would pay with these companies, and that the sample quote is just that – a sample. Getting quotes with the details of your own business is the only way to be able to make an accurate comparison. And we can’t stress enough how easy it is! Simply fill in our online form.

If you're looking for a bit more of a back-to-basics run-down on how business energy charges work, check out our essential guide to business energy. There you'll be able to find out about different types of meters, as well as an overview of tariff types.