Coulomb Energy Supply Limited business energy supplier profile
Coulomb Energy Supply Limited is a UK non-domestic energy supplier within the px group. Ofgem records show it holds gas and electricity supply licences for non-domestic premises, and px group materials link the company to PX House in Stockton-on-Tees with shared group contact details. Public-facing information appears limited, with no clearly published business tariff or deemed/out-of-contract rate schedule found in the sources reviewed.
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Snapshot, in plain English
Is Coulomb Energy Supply Limited right for your business?
Licensed for 15 years with accounts currently filed. Sizing detail not yet independently researched, but the Companies House profile shows an established, active licensee suitable for single-site SME and mid-market multi-site contracts. Run standard counterparty due diligence before a 3-year commitment above £250k spend.
Risk band reasoning: Active, 15 years trading, accounts current.
| Your business | Fit | Why |
|---|---|---|
| Single site SME | Fit | Often competitive on single-site fixed rates. |
| Multi-site SME | Fit | Most mid-market suppliers handle multi-site billing. |
| I&C £250k to £1m spend | Possible | Check counterparty viability over a 3-year term. |
| I&C above £1m spend | Not suited | Below the scale threshold for I&C tenders. |
Quick facts
| Trading name | Coulomb Energy Supply Limited |
|---|---|
| Licence holder | |
| Supplies | Gas and Electricity |
| Website | pxlimited.com |
| Business phone | 01642 623000 |
| Email / contact | enquiry@pxlimited.comContact page |
| Rate status | Quote required |
Company data
Live data on the licence-holding companies behind Coulomb Energy Supply Limited, compiled by Purely Energy's independent research team and refreshed monthly.
Coulomb Energy Supply Limited out-of-contract and deemed rates
Not publicly published / quote required
If you are on deemed, default, rollover, variable, or Out-of-contract rates, ask for a written renewal quote and compare it against live market prices before agreeing a new contract.
Where your p/kWh actually goes
Indicative split for a UK I&C electricity bill in 2026, sourced from Cornwall Insight's non-commodity cost research. Your meter, region and contract type shift the exact mix, but the four components are always present.
- Wholesale energy, 38%Gas or power bought on the wholesale market. The figure most coverage focuses on.
- Non-commodity costs, 53%Network charges (DUoS, TNUoS), policy levies (RO, FiT, CfD, Capacity Market), CCL and balancing costs.
- Supplier margin, 6%What the supplier earns. Always priced into the unit rate.
- Broker margin, 3%What we earn for tendering and managing the contract. Shown separately on every Purely Energy quote.
Who Coulomb Energy Supply Limited may suit
Best suited to business and industrial customers rather than domestic supply. Ofgem indicates the company supplies non-domestic premises, and the parent group positioning suggests an infrastructure/industrial-energy orientation.
Trading name and licence-holder notes
The licence holder appears to trade under the px group brand rather than a standalone consumer-facing Coulomb brand. Public contact details point to pxlimited.com and PX Limited, and Ofgem lists an encompassing licence relationship with PX Supply Limited.
Switching from Coulomb Energy Supply Limited to a fixed business contract
UK businesses can switch gas and electricity supply away from Coulomb Energy Supply Limited once their fixed contract ends, or after resolving any open objection or termination-window issue. The process is the same for every supplier on the non-domestic market, but a few checks done in the right order make the transfer materially faster.
- 1. Find your contract end date. It's on your last renewal letter or the most recent bill from Coulomb Energy Supply Limited. Most non-domestic contracts have a 1 to 6 month termination window before that date, outside of which you may auto-roll onto a new fixed term.
- 2. Get your MPAN and MPRN ready. The 21-digit MPAN (electricity) and 6 to 10-digit MPRN (gas) uniquely identify each meter and are needed for any competing quote. Both appear on your bill.
- 3. Compare against the live market. Coulomb Energy Supply Limited doesn't publish standard out-of-contract rates, so request a written renewal quote first and benchmark it against live market prices before agreeing anything. Purely Energy can run your meters against the wider UK panel and come back with the cheapest fixed offers.
- 4. Settle the final bill and clear any objections. Coulomb Energy Supply Limited will issue a final bill within 6 weeks of supply transferring. If a balance is outstanding, they can object to the switch under industry rules, so clear it before the transfer date to avoid a hold.
- 5. Sign the new contract. Once the new supplier has your MPAN/MPRN and signed contract, the transfer typically completes within 4 to 8 weeks. There is no break in supply, you simply receive your first bill from the new supplier.
Need help with any of these steps? Our team handles the paperwork end-to-end as part of every quote.
Need help comparing Coulomb Energy Supply Limited?
Purely Energy can check your current rates, compare renewal options across gas and electricity suppliers, and review whether switching could reduce your business energy costs.
FAQs
Who supplies energy under the Coulomb Energy Supply Limited brand?+
The Ofgem non-domestic licence is held by COULOMB ENERGY SUPPLY LTD., ultimately part of PX Limited / px group. The trading name on your bill or contract may differ from the licence holder, which is normal and reflects how UK energy is regulated.
What is the Coulomb Energy Supply Limited business contact number?+
Coulomb Energy Supply Limited can be reached on 01642 623000 or by email at enquiry@pxlimited.com. The official contact page is https://www.pxlimited.com/contact-us-px-group/.
Does Coulomb Energy Supply Limited publish out-of-contract rates?+
Coulomb Energy Supply Limited does not appear to publish a standard deemed or out-of-contract rate online. Business customers should request a written renewal quote in advance of their contract end date and compare it against live market prices.
Can I switch away from Coulomb Energy Supply Limited?+
In most cases, businesses can switch gas and electricity supply away from Coulomb Energy Supply Limited at the end of a fixed-term contract or after resolving any objections, debt, termination-window, or meter-data issues. The safest route is to check your contract terms, final bill position, and renewal dates before starting a transfer.
How long does it take to switch from Coulomb Energy Supply Limited?+
Once a new supplier has the meter point details (MPAN/MPRN) and a signed contract, a non-domestic switch typically completes within 4 to 8 weeks. Supply does not break: the new supplier takes over billing on the transfer date.
Is Coulomb Energy Supply Limited a UK-licensed supplier?+
Yes. Coulomb Energy Supply Limited is on the Ofgem non-domestic licensee register for both gas and electricity. Ofgem maintains the official register at ofgem.gov.uk.
What are out-of-contract business energy rates?+
Out-of-contract rates are the prices a business pays when no fixed-term contract is in place with its supplier. They can be materially higher than negotiated contract rates, so businesses should check their contract end date and renewal window before they expire.
Other UK gas and electricity suppliers
Compare Coulomb Energy Supply Limited against these other UK non-domestic gas and electricity licensees on the same directory.
- 100GreenGREEN ENERGY (UK) LTD.
- Axpo UKAXPO UK LTD.
- BGI Trading LimitedBGI TRADING LTD.
- BP Gas Marketing LtdBP GAS MARKETING LTD.
- Brook Green Trading LtdBROOK GREEN TRADING LTD.
- DGP Energy / Delta Gas and PowerDGP ENERGY LTD.
Or browse the full UK business energy supplier directory.
Sources
Public data this profile is built from. Always verify rate and contract details on the supplier's own website before relying on them.