Established almost 30 years ago, Yorkshire-based business gas supplier CNG Energy is today the largest independent shipper of gas in the country. Get the full lowdown on CNG Energy with real customer reviews, find the contact numbers you need, and discover how to submit online meter readings and payments in our guide.

CNG Energy in Summary:

Market: England, Scotland and Wales  Competitive pricing
Customers: 50,000 business premises  Only offers gas - no electricity option
Selectra score:★★  Mixed reviews online

Who are CNG Energy?

Founded shortly after the UK gas market was deregulated in 1994, Contract Natural Gas Limited - known as CNG Energy - provides gas exclusively to business customers and has received several accolades for outstanding customer service. In addition to its gas supply, CNG Energy also provides meter installations and replacements.

Who owns CNG?

Contract Natural Gas Ltd is part of the CNG Group, which is also made up of the following subsidiaries:

  • Contract Natural Gas Software Limited
  • CNG Merchant Services Limited
  • CNG Electricity Limited
  • CNG Energy Limited
  • CNG Switch Limited

CNG Energy Login

Illustration of a laptop displaying CNG Energy login page

At present, CNG Energy does not have its own online customer portal, though this is something the business energy supplier is hoping to launch soon.

In the meantime, customers can still manage some aspects of their account online without the need for a CNG Energy login, such as submitting a gas meter reading, making a payment, or requesting a copy invoice.

CNG gas meter reading

By submitting your own CNG gas meter reading, you’ll be only be billed for the energy you’ve used, rather than an estimate based on your previous usage.

CNG Energy customers can submit their meter readings online by visiting the supplier’s website. Navigate to the CNG gas meter reading page by clicking ‘customers’ followed by ‘submit a meter reading’. Don’t forget to have the following information to hand when submitting a meter reading:

  • Account holder’s name
  • Reference number - you’ll find this on your invoice
  • Meter reading
  • Date of meter read
  • Email
  • Telephone number

The supplier recommends submitting your CNG gas meter reading between the 25th and 1st of each month.

Make a secure payment

You can also make quick and simple invoice payments by visiting the CNG Energy payment site at You’ll need the following details to make an online payment:

  • Shipper account number
  • Invoice number
  • Payment amount
  • Debit or credit card details

You’ll be sent an email confirmation of your payment shortly after it is made.

CNG Energy Customer Reviews

Despite winning awards for its customer service in recent times, CNG Energy currently holds an average rating of just 2.7 out of 5 stars on consumer rating site Trustpilot. 32% of CNG Energy reviews on the site scored its highest rating of ‘Excellent’, with a further 12% of customers rating the supplier as ‘Great’.

We have been with CNG for about 3 years now, at one of our two commercial premises. Recently renewed again - easily and quickly on the telephone, without long wait during the COVID-19 situation. Helpful staff member, Leeroy today too! Highly Recommend.

Lucy White, Trustpilot

At the other end of the rating scale, over half of the reviews on Trustpilot ranked CNG Energy as ‘Bad’ (49%) or ‘Poor’ (5%). Common complaints included fluctuating costs and extortionate charges.

Avoid this company at all costs. I had a fish and chip shop and this company was bleeding me dry, my gas bill was different every month, 300 pounds sometimes and up to 800 pounds many other times... I had many arguments on the phone with them and I was trapped into using them for four years. They said they didn't receive my notice to quit my contact even though I sent it in plenty of time. I threatened them with Ombudsman after speaking with my solicitor, they then let me out of the contract.

Steve Young, Trustpilot

CNG Energy received a slightly better score on Google reviews, with an average of 3.5 out of 5 stars. The majority of positive reviews appear to be for the CNG Energy customer service team and how the supplier has dealt with customers during the COVID-19 pandemic.

In these worrying times due to being closed due to Covid19, I can not tell you how Fantastic CNG have dealt with me. I would recommend this company to anyone looking for a new supplier.

Elaine Lofthouse, Google reviews

In contrast, many customers leaving negative CNG Energy reviews were frustrated at being rolled over to out-of-contract rates without any notification, while some claimed to have been billed for a gas supply that didn't even exist.

Was rolled onto a 'variable rolling contract' without being written to or contacted which results in me having to give them 30 days’ notice. They try and block you from commencing the move until 30 days time, which isn't correct, you can start the process straight away, but it gets them around another 2-4 weeks of supply unit income. After phoning to give notice on the phone (which I wasn't pleased about in the first place) I was advised I could only do this in writing. I have given notice to around 6 energy providers in the last 7 days, this was the first time I have faced this issue. Unimpressed with my experience and will be glad to be leaving!

Greg White, Google reviews

CNG Energy Services, Rates & Tariffs


CNG Energy currently only offers gas for new customers, though it does plan to also supply electricity in the near future.

CNG Energy provides a flexible billing structure for its customers, with customised payment terms based on your operation’s specific circumstances, and separate invoices for different commercial sites, if required.

CNG Energy: small to medium-sized business rates

CNG Energy Business Gas Rates
Fixed-rate term Standing charge Unit rate Estimated annual cost
1 Year 88p per day 3.4p per kWh £1,171.20
2 Years 89p per day 3.5p per kWh £1,199.85

Based on a Small Business in London paying on Direct Debit with a gas consumption of 25,000kWh per year on a single-rate meter. Prices are correct as of May 2021.

How do I convert gas units to kWh? Although your gas tariff is billed in kilowatt-hours (kWh), your meter may actually record consumption in cubic metres (m3) or cubic feet. Confused? Find out how to convert gas units to kWh the easy way.

Deemed and out of contract rates

Illustration of a magnifying glass and energy bill

If you move into a CNG Energy-supplied property without signing a contract first, the provider will place you on a deemed rate tariff. If your contract agreement expires and you do not contact CNG Energy to arrange a new one, you will be rolled onto an out-of-contract (OOC) tariff.

The cost of energy for deemed and out of contract tariffs is usually far higher than for fixed rates. CNG Energy is not obliged to provide you with notice when deemed energy rates change. These rates apply until the customer either switches to another business energy supplier or signs a new contract with CNG Energy. Let’s take a look at the supplier’s current deemed and OOC energy rates.

CNG Energy Out of Contract rates

CNG Energy Gas OOC Rate
Daily standing charge Unit rate
Dependent on gas consumption 7.50p per kWh
CNG Energy Electricity OOC Rate
Daily standing charge Unit rate
50p 25p per kWh

CNG Energy deemed rates

CNG Energy Gas Deemed Rate
Daily standing charge Unit rate
Dependent on gas consumption 7.95p per kWh
CNG Energy Electricity Deemed Rate
Daily standing charge Unit rate
50p 25p per kWh

If you're on deemed or out-of-contract terms, we recommend switching suppliers or signing a new contract as soon as possible, because these are typically the most expensive rates a supplier can charge. For advice on getting the best gas and electricity deal for your business, contact a Selectra energy expert on 020 3318 3633 or request a free callback now.

Additional CNG Business Services

In addition to its gas supply, CNG Energy also offers:

  • Wholesale gas shipping
  • Gas and electricity installation
  • Automated meter reading (AMR)
  • Meter installation, relocation and replacement

Contact CNG Energy


CNG Energy offers a number of ways for new and existing customers to get in touch. Calling, contacting via social media, sending an email, or mailing a letter are all options.

CNG contact number

If you need to contact CNG Energy by phone, there is only one number to call. This number is used for everything from general enquiries and sales to gas meter readings and handling complaints. Calls to the CNG Energy contact number are charged at the same rate as a standard local landline call.

Contact CNG Energy by phone
CNG Energy Contact Number Opening Hours
0344 5678 427 Mon, Tues & Thur: 9.30am-5pm; Wed: 10am-5pm; Fri 9.30am-4pm

Calls to the CNG business contact number are charged at the same rate as a standard local landline call.

CNG Energy postal address

Should you prefer to contact CNG Energy by mail, you can write to:

CNG (Group) Limited
2 Victoria Avenue
North Yorkshire HG1 1EL

CNG Energy on social media

Prefer to send CNG Energy a Tweet or Facebook message? Like most modern business energy suppliers, CNG Energy is also active on most social media channels:

  • CNG Energy on Facebook

  • CNG Energy on Twitter

  • CNG Energy on Linkedin

  • CNG Energy on Instagram

    CNG Energy Complaints

    If you're a CNG Energy customer who's unhappy with the service you've received, you can file a formal complaint by following the steps below.

    1. Contact CNG Energy as soon as you become aware of any issues. You can reach out to the supplier using the CNG Energy contact number above, email or write to Amy Collins at the postal address above. CNG Energy also welcomes in-person visits on weekdays between 9am and 5pm.

    2. The supplier will attempt to resolve your complaint immediately, but if this is not possible, your CNG Energy complaint will be assigned to a member of customer services for further investigation. You will be contacted within 48 hours with confirmation of this and the supplier will keep you updated throughout the process.

    3. CNG Energy may offer an apology, explanation, or compensation as part of its complaints procedure. However, if you remain unsatisfied with the supplier’s proposed resolution after eight weeks, you will be issued with a ‘final response’ letter, explaining the decision. If your organisation is classified as a microbusiness, you can seek advice from the Energy Ombudsman on the next steps to take. If you are not a microbusiness, you have the option to seek independent legal advice instead.
    • Your company is considered a microbusiness if it...
    • Employs fewer than 10 employees (or their full-time equivalent) and has an annual turnover or balance sheet no greater than €2 million
    • Uses no more than 100,000 kWh of electricity per year or
    • Uses no more than 293,000 kWh of gas per year.

    Make a complaint to the Energy Ombudsman Service

    If your company is a microbusiness, you can take your CNG Energy complaint to the Energy Ombudsman. The Ombudsman’s role is to assist in resolving disputes between energy suppliers and their customers. Its services are both free and independent, which means it acts on both parties' information and does not take sides.

    By post

    Ombudsman Services: Energy
    PO Box 966
    Warrington WA4 9DF

    By phone

    Energy Ombudsman Contact Number Opening hours
    0330 440 1624 Mon-Fri: 8am-8pm, Sat: 8am-1pm

    Calls to the Energy Ombudsman contact number are charged at the same rate as a standard local landline call.

    By email

    CNG Energy: The Verdict

    White Selectra tick in a blue box

    CNG Energy is a business energy supplier which keeps things simple for SMEs by offering just a few basic gas tariffs which are fairly competitively priced. It has won awards for its customer service over the years and many of its long-standing customers seem satisfied with the supplier.

    Unfortunately, some red flags in online customer reviews, such as incorrect billing issues and penalty charges, do overshadow the positives.

    In addition, customers who want both gas and electricity from the same supplier will have to look elsewhere, as CNG Energy currently only provides business gas. However, the supplier has said it hopes to begin taking on new electricity customers in the near future.

    Based on the information above, we give CNG Energy a final score of 2 out of 5 stars.

    Selectra Score: ★★

    Looking to get set up with CNG Energy or want to find out more about other business energy suppliers? Speak to a Selectra business energy expert today to save an average of £1,305* on your business energy. Give us a call on 020 3318 3633 or request a free callback now.

    *Of customers who made a saving on a three-year business energy contract between January 2020 and May 2020, the average amount saved was £1,305.