100Green business energy supplier profile
100Green is the customer-facing brand of Green Energy (UK) Ltd, positioning itself as the UK’s only supplier of 100% green gas and renewable electricity. The site highlights fixed, variable, time-of-use, and premium green tariffs for domestic and business customers, with a strong sustainability-led proposition and direct phone-led customer service.
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Snapshot, in plain English
Is 100Green right for your business?
Licensed for 25 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, 25 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 | 100Green |
|---|---|
| Licence holder | |
| Supplies | Gas and Electricity |
| Website | greenenergyuk.com |
| Business phone | 01920 486 156 |
| Email / contact | business@100green.com; hello@100green.comContact page |
| Rate status | Quote required |
Company data
Live data on the licence-holding companies behind 100Green, compiled by Purely Energy's independent research team and refreshed monthly.
100Green 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 100Green may suit
Suitable for SMEs and business energy users that prioritise renewable supply, sustainability credentials, and direct contact with a specialist supplier. The site indicates it also serves commercial generators and business customers, but published business OOC/deemed rates were not found, so pricing likely requires a quote.
Trading name and licence-holder notes
The licence holder appears to trade under the 100Green brand rather than its legal name, Green Energy (UK) Ltd. Ofgem documents also reference Green Energy (UK) Limited as the licensee with derogations related to its renewable tariff model.
Switching from 100Green to a fixed business contract
UK businesses can switch gas and electricity supply away from 100Green 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 100Green. 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. 100Green 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. 100Green 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 100Green?
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 100Green brand?+
The Ofgem non-domestic licence is held by GREEN ENERGY (UK) LTD., ultimately part of Green Energy (UK) Ltd (registered in England No. 4194006). 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 100Green business contact number?+
100Green can be reached on 01920 486 156 or by email at business@100green.com; hello@100green.com. The official contact page is https://100green.com/contact/.
Does 100Green publish out-of-contract rates?+
100Green 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 100Green?+
In most cases, businesses can switch gas and electricity supply away from 100Green 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 100Green?+
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 100Green a UK-licensed supplier?+
Yes. 100Green 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 100Green against these other UK non-domestic gas and electricity licensees on the same directory.
- Axpo UKAXPO UK LTD.
- BGI Trading LimitedBGI TRADING LTD.
- BP Gas Marketing LtdBP GAS MARKETING LTD.
- Brook Green Trading LtdBROOK GREEN TRADING LTD.
- Coulomb Energy Supply LimitedCOULOMB ENERGY SUPPLY 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.