Drax business energy and Haven Power: what to know

Haven Power became Drax

If you remember Haven Power or have an old contract in that name, the supplier is now branded Drax. Drax announced the change on 14 September 2021. Drax Group had bought Haven Power in 2009, and the rename was meant to show it is part of the wider group alongside its power generation business.

Drax's own customer notice says the legal name was changing from Haven Power Limited to Drax Energy Solutions Limited, and that service, account contacts, prices and contract terms did not change. Invoices and bank statements, however, started to show the new name. If you pay by BACS the notice says to update the payee name, while the bank details stay the same. Customers who want written confirmation on headed paper can email the address given on the notice, customer@drax.com.

Who does Drax supply?

This is the most important point for a small business. At the time of the rename, Drax described its customer base as more than 20,000 large industrial and commercial customers, using more than 12 TWh of renewable-sourced electricity a year. In other words, it is mainly a supplier to bigger energy users, not corner shops, salons or small offices.

That does not mean you cannot be a customer. A mid-sized multi-site operator, a farm with heavy loads or a manufacturer might well be. But a typical microbusiness should expect that other suppliers focus on the small end of the market. Compare it on its merits, not its brand name. See large and multi-site business energy if your usage is higher.

What about Opus Energy?

Many people searching for Drax are really looking for Opus Energy, which is a different brand with a different history.

• In December 2016 Drax announced it would buy Opus Energy for £340m. At that point Opus had a large small and medium business book and used around 160 third-party intermediaries, mainly for its SME sales.
• On 26 June 2024 Drax announced that a strategic review of its non-core SME supply business had led to an agreement to sell up to 90,000 SME customer meter points to EDF Energy Customers Limited.
• Drax's annual report, published in February 2025, says the sale of the majority of the Opus Energy meter points completed in September 2024, and that an agreement for the remaining meter points followed in February 2025.
• Drax said its Energy Solutions business, focused on industrial and commercial customers, was unaffected.

If you have an Opus contract, read our Opus Energy guide and check your latest bill for the exact company name and any notice of transfer. Our EDF business guide may also help.

If you were an Opus customer: a transfer checklist

Customers moved between suppliers in a book sale keep their supply, but the paperwork changes. Work through these points:

1. Find the first bill from the new supplier and confirm it shows the same MPAN or MPRN as your old Opus bill.
2. Check the unit rate, standing charge and end date match what you agreed. A sale of customer accounts does not by itself give the buyer the right to change a fixed price.
3. Compare the closing reading on the final Opus bill with the opening reading on the new one. The two should be the same.
4. Check the Direct Debit amount and the payee name, and update any BACS payee details.
5. Ask for any credit balance to be carried across or refunded, and get the figure in writing.

Example: checking the handover reading

Say the final Opus bill closes at 52,340 kWh and the new supplier opens at 52,940 kWh. The gap is 52,940 − 52,340 = 600 kWh. At an illustrative 27p/kWh that is 600 × £0.27 = £162 that would either be billed twice or not at all. Raise any mismatch with the new supplier straight away, with photos of the meter if you have them.

How to contact Drax

Use the contact details on your own bill or in your account portal, or the contacts on Drax's official website. We have not printed phone numbers here because the ones we could verify were limited to the rebrand notice's email address. The Drax notice says the online portal kept the Haven Power branding for a time with a new portal planned, so if a login page looks old, check you are on the genuine Drax address before entering details.

Reading a Drax-style contract and renewal

Larger commercial contracts often differ from the simple fixed-price deals offered to small shops. Look for these points on any commercial supplier's paperwork:

• Pass-through charges: network and policy costs may be billed at cost rather than fixed. See pass-through vs fixed charges.
• Supply capacity and kVA charges that depend on how much load you reserve. See supply capacity and kVA charges.
• Half-hourly metering, which means bills follow your actual usage pattern. See half-hourly meters.
• Renewal terms and the date by which you must act.

Rollovers cannot exceed 12 months under Ofgem's rules for microbusiness contracts, but do not assume that a large contract works the same way. Read your terms, because protections differ with your size.

How to switch away

You can generally leave at the end of a fixed term, or during the renewal window Ofgem says opens a few months before the end date. Variable, out-of-contract and deemed contracts can be left at any time, and microbusinesses cannot be charged a termination fee when out of contract. If you owe the supplier money it may object to a switch, so settle that first. Full process: how to switch business energy supplier.

Complaints and the Ombudsman

Complain to the supplier first, in writing, and keep records. If you are still stuck after 8 weeks, or you receive a deadlock letter, microbusinesses and small businesses can go to the Energy Ombudsman within 12 months. The Ombudsman's eligibility is set by the micro and small business tests, so a customer above both thresholds will normally need to rely on the supplier's own process and the contract. Check your size first. See energy disputes and the Ombudsman.

Next steps

• Check the exact legal name on your latest invoice.
• Check your contract end date and notice terms.
• Compare at least two other quotes before renewing: business energy comparison.

Biz Energy is independent and is not affiliated with Drax, Haven Power or Opus Energy. We take no commission and this page is not an endorsement or a recommendation.