100Green business prices and tariffs review

100Green is one of the more distinctive names in the UK business energy market. Rather than competing mainly as a mass-market business electricity supplier, it positions itself as a specialist green energy provider for homes and businesses, with a particularly strong focus on renewable electricity and green gas.

For businesses, the main attraction is not likely to be headline-cheap unit rates. It is more likely to be the ability to buy energy from a supplier that makes sustainability a central part of its proposition. 100Green offers business electricity and business gas, and it is especially notable for its emphasis on 100% renewable electricity and green gas tariffs.

However, there is one important drawback for price comparison: 100Green does not publish a simple live table of business unit rates and standing charges. Businesses need to request a quote based on their meter type, annual consumption, site details and contract end date. That means 100Green can be a strong option to include in a green business energy comparison, but it is not the easiest supplier to benchmark purely on price.

100Green business energy at a glance

Category	100Green business energy review
Supplier name	100Green
Legal company name	Green Energy (UK) Limited
Company number	04194006
Founded/incorporated	2001
Business energy products	Business electricity and business gas
Green electricity	100% renewable electricity fuel mix
Green gas	Green gas options available, including higher-green-gas tariffs
Public business prices	Not published as a standard table
Quote method	Online quote form or direct contact
Suitable for	SMEs and organisations that prioritise renewable energy credentials
Less suitable for	Businesses that only want the lowest possible unit rate
Customer review position	Strong customer scores compared with many energy suppliers
Overall view	A sustainability-led supplier worth comparing, especially for businesses that need credible green energy credentials

Our verdict on 100Green for business energy

100Green is a good fit for businesses that want their energy contract to support wider environmental goals. Its biggest strength is the credibility and clarity of its green energy positioning. The company has been active in the market for many years, supplies both electricity and gas, and has built its brand around renewable electricity and green gas rather than treating green energy as an optional add-on.

For a small office, retailer, hospitality business, professional services firm, charity, agency or values-led SME, 100Green could be worth considering if sustainability is a genuine part of the purchasing decision. It may also appeal to businesses that want a supplier with a relatively strong customer service reputation.

The main weakness is price transparency. Unlike some business energy suppliers that publish indicative deemed rates, out-of-contract rates, domestic-style tariffs or business quote examples, 100Green’s business prices are quote-led. This is common in the business energy market, but it makes it harder for a business to know whether 100Green is competitive without getting a live quote.

Overall, 100Green is best viewed as a green specialist rather than a bargain-basement business energy supplier.

100Green business ratings

Area reviewed	Rating	Reason
Green credentials	5/5	Strong renewable electricity and green gas proposition
Price transparency	2/5	Business rates are not published in a simple tariff table
Tariff choice	3.5/5	Offers business electricity and gas, but quote details vary by site
Customer service reputation	4.5/5	Strong review profile and positive independent customer service indicators
Business suitability	4/5	Good for SMEs and green-focused organisations
Large energy user suitability	3/5	Larger users should compare carefully against specialist commercial suppliers
Overall rating	4/5	A strong green supplier, but businesses must obtain a quote to judge value

Who is 100Green?

100Green is the trading brand of Green Energy (UK) Limited. The company has been active for more than two decades and rebranded from Green Energy UK to 100Green.

The supplier is based in Ware, Hertfordshire, and serves both domestic and business customers. It is a smaller supplier compared with the largest UK business energy companies, but it has a relatively distinctive position because it focuses heavily on green electricity and green gas.

For businesses, this means 100Green is not just another supplier offering standard fossil-fuel-backed energy with a green tariff label. Its proposition is centred on matching customers with renewable electricity and green gas products, including tariffs designed for customers that want stronger environmental credentials.

What business energy products does 100Green offer?

100Green offers energy for business customers, including:

Product	Available from 100Green?	Notes
Business electricity	Yes	Businesses can request quotes for electricity supply
Business gas	Yes	Gas is available, including green gas options
Dual fuel business energy	Yes	Businesses can request electricity and gas together
Single-rate electricity	Yes	Available to quote, depending on meter type
Two-rate electricity	Yes	The quote form supports two-rate meter enquiries
Green gas	Yes	A key differentiator for 100Green
Renewable electricity	Yes	Central to the supplier’s proposition
Published fixed business tariff table	No	Quotes are site-specific
Large corporate procurement	Limited public detail	Larger businesses should request bespoke terms

The business quote form asks for details such as energy type, meter type, annual consumption, company name, company registration number, MPAN or MPRN details, and current contract end date. These details are used to estimate a price that reflects the business site rather than a generic tariff.

100Green business prices

100Green does not publish a standard live price list for business customers. That means there is no reliable public table showing current 100Green business electricity unit rates, business gas unit rates or standing charges.

This is important because business energy prices are not usually standardised in the same way as domestic default tariffs. A business quote can vary depending on:

Pricing factor	Why it matters
Annual electricity consumption	Higher usage can change the unit rate and supplier risk profile
Annual gas consumption	Gas use affects wholesale exposure and contract pricing
Meter type	Single-rate, two-rate and smart meters can be priced differently
Region	Network charges vary by distribution area
Contract length	One-year, two-year and three-year contracts can price differently
Payment method	Direct debit terms may be different from other payment arrangements
Credit risk	Some businesses may face deposits or different terms
Current contract end date	Suppliers price differently depending on when supply can start
Green gas proportion	Higher levels of green gas can affect cost
Broker involvement	Commission can be included in the contract price

Because 100Green is a green specialist, businesses should not assume it will always be the cheapest option. Green gas in particular can be more expensive than standard gas because biomethane and certified green gas supply is more limited than conventional gas.

Indicative UK business energy price benchmarks

The table below is not a list of 100Green prices. It shows wider UK non-domestic energy price benchmarks, based on government-published non-domestic price data. These figures are useful for understanding the market context when comparing any 100Green quote.

UK non-domestic electricity benchmark by size band

Business electricity size band	Annual consumption	Q4 2025 average price including CCL
Very small	0–20 MWh	36.106p/kWh
Small	20–499 MWh	29.570p/kWh
Small/medium	500–1,999 MWh	28.395p/kWh
Medium	2,000–19,999 MWh	25.356p/kWh
Large	20,000–69,999 MWh	23.555p/kWh
Very large	70,000–150,000 MWh	22.514p/kWh
Extra large	More than 150,000 MWh	21.128p/kWh
Average	All non-domestic users	23.988p/kWh

UK non-domestic gas benchmark by size band

Business gas size band	Annual consumption	Q4 2025 average price including CCL
Very small	Under 278 MWh	8.121p/kWh
Small	278–2,777 MWh	4.887p/kWh
Medium	2,778–27,777 MWh	4.571p/kWh
Large	27,778–277,777 MWh	3.918p/kWh
Very large	277,778–1,111,112 MWh	3.835p/kWh
Average	All non-domestic users	5.067p/kWh

These figures show why small businesses often pay more per kWh than large industrial users. A microbusiness with modest consumption will usually have less buying power and a higher per-unit cost than a large business with predictable annual demand.

Example annual business energy costs

The examples below use wider market benchmark prices, not 100Green quote prices. They are designed to show how quickly annual energy spend can rise across different business sizes.

Example business	Electricity use	Gas use	Indicative annual electricity cost	Indicative annual gas cost	Indicative total
Micro office or small shop	10,000 kWh	20,000 kWh	£3,611	£1,624	£5,235
Small retailer or café	25,000 kWh	50,000 kWh	£7,392	£4,061	£11,453
Medium hospitality site	75,000 kWh	300,000 kWh	£22,177	£14,660	£36,837
Larger commercial site	750,000 kWh	3,000,000 kWh	£212,964	£137,136	£350,100

These totals exclude some real-world bill details, such as VAT treatment, standing charges, capacity-related charges, broker commission and site-specific contract terms. However, they give a useful guide to the scale of costs a business should test against a live 100Green quote.

Does 100Green offer cheap business energy?

100Green may be competitive for some businesses, but it should not be assumed to be the cheapest supplier. Its key selling point is green energy, not necessarily the lowest unit rate in the market.

For a business that simply wants the cheapest possible contract, it would be sensible to compare 100Green against several suppliers, including larger commercial energy companies and business energy brokers. For a business that wants verified green electricity and green gas, 100Green may offer a stronger value proposition even if the unit rate is higher.

In practice, the question is not just “Is 100Green cheap?” but “Is the green premium, if any, worth paying for this business?”

What tariffs does 100Green offer?

100Green’s public tariff structure is more visible for domestic customers than for business customers. For business users, the main approach is quote-based supply rather than a fixed menu of public business tariffs.

However, its broader tariff families show the type of energy proposition the supplier is known for.

Tariff or product type	Main feature	Business relevance
Business electricity quote	Site-specific electricity pricing	Directly relevant to business customers
Business gas quote	Site-specific gas pricing	Directly relevant to business customers
EKO	Strong green electricity and green gas credentials	Relevant where available for business use
Tide-style time-of-use tariffs	Lower-price periods for shifting electricity use	Potentially relevant where smart/time-of-use structures are offered
Sparkling-style tariffs	Renewable electricity with green gas content	Shows the supplier’s wider product approach

Businesses should check the exact tariff name, term, standing charge, unit rate, green gas percentage and exit terms before signing.

100Green EKO tariff review

EKO is one of the most important parts of 100Green’s proposition. It is positioned as a high-credibility green tariff, with 100% renewable electricity and 100% green gas.

For businesses, this matters because many suppliers can offer renewable electricity tariffs backed by renewable electricity certificates, but far fewer can offer a strong green gas proposition. Green gas is harder to source than renewable electricity because it depends on biomethane production and certification.

A business considering EKO should ask:

Question	Why it matters
Is EKO available for this business site?	Product availability may depend on the quote
Is the gas 100% green gas?	Some tariffs include only a percentage of green gas
What certification is supplied?	Businesses may need evidence for reporting
How much more does it cost?	Green gas can carry a premium
Does the tariff include exit fees?	Important if business circumstances change
What happens at renewal?	Renewal rates can differ materially from initial quotes

EKO may be particularly relevant for businesses with a strong environmental brand, B Corp ambitions, sustainability reporting needs, or customer-facing premises where green energy is part of the company story.

100Green green electricity

100Green reports a 100% renewable electricity fuel mix. This is a major selling point for businesses that want to reduce their market-based Scope 2 emissions and support renewable power.

For business customers, renewable electricity can be useful for:

Use case	Benefit
Sustainability reporting	Helps evidence renewable electricity purchasing
Customer communications	Supports green marketing claims, if accurate and evidenced
Tender responses	May help with supplier sustainability questionnaires
Internal ESG targets	Supports energy procurement targets
Values-led purchasing	Aligns operational spend with environmental priorities

Businesses should still ask for contract documents and certificate evidence. A green electricity claim should be supported by clear documentation, especially where the business intends to use it in reporting, tenders or marketing.

100Green green gas

Green gas is one of the areas where 100Green stands out. Many business energy suppliers offer renewable electricity, but green gas is less common because the UK gas grid is still largely fossil-gas based.

Green gas usually refers to biomethane injected into the gas grid and matched to customers through certification. This means the molecules physically delivered to a business premises are not separated from the wider gas grid, but the supplier can evidence that certified green gas has been produced and injected into the network.

For businesses that use gas for heating, catering, manufacturing, laundry, brewing, food production or hospitality, green gas may be an attractive way to reduce the environmental impact of unavoidable gas consumption. However, it is unlikely to be the cheapest gas option.

100Green fuel mix

100Green’s electricity fuel mix is simple compared with many suppliers.

Electricity source	100Green fuel mix
Coal	0%
Natural gas	0%
Nuclear	0%
Renewables	100%
Other	0%

Its reported electricity carbon impact is also 0.00g CO2 per kWh, compared with a wider UK fuel mix that still includes gas, nuclear and a small proportion of coal.

For a business buyer, this is one of the clearest arguments for including 100Green in a comparison. It is easier to understand than a standard mixed-fuel supply, especially for SMEs that want a straightforward renewable electricity message.

How 100Green business bills are structured

A 100Green business energy bill is likely to include more than just the unit rate. Like other suppliers, the bill may include a mix of wholesale energy costs, network charges, environmental obligations, metering costs, supplier operating costs and taxes.

Common business bill components include:

Bill component	What it means
Unit rate	The price paid for each kWh of electricity or gas
Standing charge	Daily fixed charge for supply, metering and network-related costs
VAT	Usually 20% for most businesses, though reduced rates can apply in some cases
Climate Change Levy	Tax applied to many business energy bills
Network charges	Costs for transporting electricity or gas through networks
Metering charges	Charges linked to metering and data services
Broker commission	May be included if the contract was arranged through a broker
Green premium	Possible additional cost for higher-quality green energy or green gas
Exit charges	Possible cost for leaving a fixed contract early

When comparing 100Green with another supplier, a business should compare the full annual cost, not just the unit rate. A lower unit rate can be offset by a higher standing charge, commission or contract condition.

100Green business contract terms to check

Before signing a 100Green business contract, check the following points carefully.

Contract point	What to check
Contract length	Is it 12 months, 24 months, 36 months or another term?
Unit rate	Is the rate fixed or variable?
Standing charge	What is the daily standing charge per meter?
Green gas percentage	Is the gas 10%, 100% or another level of green gas?
Certificate evidence	Will you receive evidence of renewable electricity or green gas matching?
Exit fees	Are there charges for leaving early?
Renewal process	What happens when the contract ends?
Deemed rates	What rates apply if the contract expires without renewal?
VAT and CCL	Are prices shown excluding or including taxes?
Broker commission	Is any commission built into the price?
Payment terms	Is direct debit required?
Credit checks	Is a deposit or guarantee required?
Metering	Is a smart meter or half-hourly meter needed?
Estimated consumption	Is the quote based on accurate kWh data?

This is especially important for microbusinesses, because they may have additional protections compared with larger business customers, but they are still not covered by the domestic energy price cap.

Is 100Green covered by the energy price cap?

Business energy contracts are not protected by the domestic energy price cap. The price cap is designed for domestic default tariffs, not ordinary non-domestic contracts.

This means a business should not compare a 100Green business quote directly with the domestic price cap and assume the same protections apply. Business contracts are usually negotiated separately, and the agreed rate can depend on wholesale costs, contract length, consumption, meter type and supplier margin.

For microbusinesses, there are specific rules around information and contract treatment, but this is not the same as having domestic-style capped pricing.

100Green customer reviews

100Green has a stronger customer review profile than many energy suppliers. Its Trustpilot rating is high compared with much of the energy market, and its independent customer service indicators are also favourable.

Review source	100Green performance
Trustpilot	4.6 out of 5
Trustpilot review volume	More than 1,500 reviews
Trustpilot five-star share	Around three quarters of reviews
Citizens Advice ranking	Top 10 position in recent supplier table
Citizens Advice overall score	3.62 out of 5 for Oct–Dec 2025
Contact waiting time score	4.8 out of 5
Which? customer indicator	Strong recommendation score reported by supplier

This does not guarantee every business customer will have a good experience. Business energy accounts can be more complex than domestic accounts, especially where there are meter transfers, estimated reads, contract disputes or billing errors. However, 100Green appears to have a stronger service reputation than many larger energy brands.

100Green customer service review

100Green’s customer service proposition is built around a UK-based team rather than outsourced or AI-led support. This may appeal to business customers that want to speak to a human when dealing with a contract, meter issue or billing query.

For small businesses, customer service can be almost as important as price. A saving of a few pounds per month can quickly feel irrelevant if billing goes wrong, meter readings are not handled properly or contract renewal becomes difficult.

100Green’s smaller size could be an advantage for customers who value more personal support. The trade-off is that larger suppliers may offer broader account management, more digital tools or more specialist support for large multi-site businesses.

100Green for small businesses

100Green is likely to be most relevant for SMEs that use a moderate amount of energy and care about sustainability. Examples include:

Business type	Why 100Green may fit
Offices	Renewable electricity can support low-carbon workplace claims
Retailers	Green energy may align with customer-facing brand values
Cafés and restaurants	Green gas may be useful where gas cooking or heating is unavoidable
Agencies and consultancies	Helps support ESG and supplier questionnaire responses
Charities	May align with ethical procurement policies
Health and wellbeing businesses	Sustainability may support wider brand positioning
Independent hospitality venues	Useful for businesses promoting local and environmental values

For very price-sensitive businesses, the main question is whether the sustainability benefit justifies any difference in cost compared with a cheaper conventional supplier.

100Green for larger businesses

Larger businesses can still consider 100Green, but they should be more rigorous in the comparison process. A larger site consuming hundreds of thousands or millions of kWh per year needs to assess more than the green credentials.

Larger users should ask for:

Requirement	Why it matters
Half-hourly or smart metering compatibility	Larger sites may need more advanced metering arrangements
Bespoke pricing	Large users should not accept SME-style generic assumptions
Clear pass-through terms	Network and non-commodity charges can materially affect costs
Certificate documentation	Important for ESG reporting and audits
Multi-site capability	Needed if the business has several locations
Account management	Large accounts may require dedicated support
Renewal strategy	Energy-intensive users need to avoid expensive rollover rates

For high-consumption users, even a difference of 1p/kWh can be worth thousands or tens of thousands of pounds per year.

100Green prices compared with other suppliers

Because 100Green business prices are quote-only, it is not possible to produce a definitive live price ranking against other suppliers without obtaining same-day quotes.

However, businesses can still compare 100Green using a structured scoring method.

Comparison area	What to compare
Electricity unit rate	p/kWh for each meter and time band
Gas unit rate	p/kWh for gas supply
Standing charge	Daily charge per meter
Annual estimated cost	Total projected annual cost based on real consumption
Contract length	Fixed period and renewal terms
Green electricity evidence	Renewable electricity certification and fuel mix
Green gas evidence	Green gas percentage and certification
Exit terms	Whether early termination is allowed and at what cost
Billing quality	Reviews, complaints and billing support
Supplier stability	Company history and market presence

The fairest comparison is to give every supplier the same annual kWh usage, meter type, region and contract start date. Otherwise, a quote comparison can be misleading.

Pros and cons of 100Green business energy

Pros

Advantage	Why it matters
Strong green credentials	100Green has a clearer renewable focus than many suppliers
Offers business electricity and gas	Useful for businesses that want one supplier for both fuels
Green gas proposition	Distinctive in a market where green electricity is more common
100% renewable electricity fuel mix	Easy for businesses to understand and communicate
Good customer review profile	Stronger review indicators than many energy suppliers
Long operating history	The company has been active for more than two decades
Suitable for values-led SMEs	Good match for businesses with environmental priorities

Cons

Disadvantage	Why it matters
No simple published business price table	Businesses must request a quote
May not be the cheapest supplier	Green gas and specialist tariffs can cost more
Less obvious fit for very large users	Large energy users may need more bespoke procurement
Product detail depends on quote	Public tariff pages do not replace a business contract offer
Green claims still need documentation	Businesses should retain evidence for reporting
Limited public business tariff examples	Harder to benchmark without direct quote data

How to get a 100Green business quote

To get a useful 100Green business quote, prepare the following information before starting.

Information needed	Where to find it
Business name	Company records or trading details
Company registration number	Companies House, if incorporated
Site address	Business premises address
Current supplier	Latest energy bill
Contract end date	Current supply contract or bill
Annual electricity use	Latest electricity bill or annual statement
Annual gas use	Latest gas bill or annual statement
MPAN	Electricity bill
MPRN	Gas bill
Meter type	Electricity bill or meter details
Current rates	Existing contract or renewal letter
Preferred contract length	Internal purchasing decision

The most important figure is annual kWh consumption. Without accurate usage data, any quote may be based on assumptions and could produce a poor comparison.

What to ask 100Green before signing

Businesses should ask 100Green these questions before agreeing a contract:

1. What is the electricity unit rate and standing charge?
2. What is the gas unit rate and standing charge?
3. Are the quoted prices excluding VAT and CCL?
4. Is the electricity 100% renewable?
5. What percentage of the gas is certified green gas?
6. What evidence will be provided for green electricity and green gas?
7. Is the contract fixed, variable or pass-through?
8. Are there any exit fees?
9. What happens when the fixed term ends?
10. Are there any broker commissions included?
11. Will the business need a smart meter?
12. Are there any security deposit requirements?
13. How are estimated bills corrected?
14. What support is available for billing disputes?
15. How much notice is needed to switch away at the end of the contract?

These questions help avoid a common business energy problem: focusing only on the headline unit rate and missing the contract conditions.

Is 100Green good for ESG and sustainability reporting?

100Green can be a strong supplier to consider for businesses with ESG or sustainability reporting needs. Its renewable electricity and green gas focus makes it easier to explain why the supplier was chosen.

However, businesses should be careful with how they describe their energy use. It is usually safer to say that the business buys renewable electricity or certified green gas through its supplier, rather than claiming that the physical electricity or gas molecules delivered to the building are exclusively renewable.

For reporting, businesses should retain:

Evidence	Why it matters
Contract documents	Shows what was purchased
Fuel mix information	Supports renewable electricity claims
Green gas certificates	Supports biomethane or green gas claims
Annual statements	Useful for carbon reporting
Supplier correspondence	Helps evidence claims if challenged
Meter readings and consumption records	Needed for kWh-based reporting

For larger businesses, finance and sustainability teams should agree how the energy contract will be reported before signing.

100Green alternatives

100Green is not the only supplier that may suit businesses seeking greener energy. Depending on the business size and priorities, alternatives may include:

Supplier type	Example alternatives to compare
Green specialist suppliers	Good Energy, Ecotricity
Large business suppliers with renewable options	EDF, British Gas, E.ON Next, SSE Energy Solutions, ScottishPower
Challenger and SME-focused suppliers	Octopus Energy, Yu Energy, Crown Gas & Power
Energy brokers	Bionic, Love Energy Savings, Utility Bidder and other business energy brokers

100Green’s strongest differentiator is green gas. If a business only needs renewable electricity, it may find more suppliers to compare. If it wants both renewable electricity and a credible green gas option, 100Green becomes more distinctive.

Is 100Green worth it for business energy?

100Green is worth considering if your business values green credentials, customer service and a clear renewable energy proposition. It is especially suitable for SMEs that want their energy contract to support environmental goals and are prepared to compare the total cost against standard business energy deals.

It may be less suitable if your business is highly price-sensitive, uses very large amounts of energy, or needs a supplier with extensive multi-site corporate account management.

The best approach is to request a 100Green quote, then compare it against at least two or three other suppliers using the same consumption figures. If the price is close, 100Green’s green electricity and green gas credentials could make it a strong choice. If it is materially more expensive, the decision depends on how much value your business places on sustainability, customer perception and reporting benefits.

100Green business energy review summary

100Green is a credible green energy supplier with a stronger environmental proposition than many mainstream business energy providers. Its 100% renewable electricity fuel mix, green gas focus and customer service reputation make it a good option for values-led SMEs.

The main limitation is price transparency. Businesses cannot easily compare 100Green from a public unit-rate table and must request a bespoke quote. That does not make it a poor choice, but it does mean businesses should compare the annual cost carefully before signing.

For EnergyCosts.co.uk readers, the practical verdict is simple: include 100Green in your comparison if green electricity and green gas matter to your business, but do not choose it without checking the full annual cost, standing charges, contract terms and green certification evidence.

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