100Green Business Energy Review: Prices, Tariffs & Comparison

100Green claims the spot as the UK’s only supplier offering 100% green gas along with renewable electricity for business customers. Since 2001, they’ve built a reputation for sustainability, holding Which? Recommended Provider status for 2025 and 2026, and ranking among the top three in the Citizens Advice customer service charts.

100Green gives businesses genuinely sustainable energy solutions while keeping prices competitive and support award-winning. Their environmental commitment goes well beyond the usual renewable electricity, which makes them a tempting pick for any company looking to cut its carbon footprint without sacrificing service.

Business owners weighing up energy suppliers might find 100Green hard to ignore. The company focuses on customer service and smart metering, and major consumer organisations have taken notice.

Overview of 100Green as a Business Energy Supplier

100Green is the UK’s only energy supplier providing 100% green gas and renewable electricity without carbon offsetting, serving businesses since 2001.

100Green stands as the UK’s only energy supplier offering 100% green gas and renewable electricity without relying on carbon offsetting. They’ve built their name on real environmental credentials and direct customer service since 2001.

Company Background and History

100Green opened its doors in 2001, originally trading as Green Energy UK. From the start, they’ve championed renewables across the country.

They’ve stuck with environmental sustainability as a core value. While other suppliers joined the green rush later, 100Green built its entire business on renewables right from the beginning.

They were named #1 for customer service by Citizens Advice in Q1 2025, and remain a top-three supplier. Uswitch awarded them best small energy supplier in 2025, and they hold green accreditation from Uswitch too.

100Green also earned ethical accreditation from The Good Shopping Guide. Ethical Consumer gave them a “Best Buy” label for their environmental efforts.

Business Model and Ethos

100Green supplies only 100% fossil-free electricity and gas on every tariff. Electricity comes from certified solar, wind, and hydro sites.

Their green gas comes from anaerobic digestion of farm, food, and landfill waste. This biogas is fully traceable and created from organic waste that breaks down naturally within weeks.

They don’t use carbon offsetting. Instead, they deliver actual green energy, not just offsets for fossil fuel emissions.

100Green puts real people on the phones for customer service. No automated menus, no chatbots, and no hidden fees or exit charges.

Position in the UK Energy Market

100Green is a small but established supplier in the UK. They’re the only provider of 100% green gas without offsetting.

They serve both homes and businesses nationwide. Their premium pricing reflects the genuine renewables they offer.

They compete with bigger suppliers by focusing on environmental credentials and customer service. Many rivals sell “green” tariffs based on offsets, not real renewables.

100Green has carved out a niche for businesses and consumers willing to pay more for authentic green energy.

Green Credentials and Sustainability Commitment

100Green supplies 100% renewable electricity from UK wind, solar and hydro plus genuine green gas from anaerobic digestion – no carbon offsetting used.

100Green backs up its environmental claims with comprehensive renewable energy solutions and real carbon reduction. Their approach combines verified renewable electricity with innovative green gas, giving businesses serious sustainability credentials.

100% Renewable Electricity

100Green supplies businesses with fully renewable electricity from certified UK wind, solar, and hydro generators. They keep their supply chain transparent, so you know where your power comes from.

Renewable electricity certificates provide third-party proof of their green credentials. Businesses can use these to show stakeholders their environmental commitment.

They offer fixed-rate renewable contracts to shield businesses from price spikes. Detailed monthly reports show how much renewable energy you use and the impact it’s having.

Their green electricity supply eliminates scope 2 emissions from purchased power. That helps businesses move closer to net-zero goals without worrying about reliability.

Green Gas and Biogas Innovations

Their green gas portfolio features biomethane made from organic waste and farm byproducts. This biogas gets purified before joining the national grid.

100Green sources biogas from UK anaerobic digestion plants and gasification sites. Their supply chain includes food waste processors and dedicated energy crop installations.

Biomethane certificates verify that your gas usage matches renewable gas injected into the grid. These help businesses prove their green gas credentials.

Using biogas cuts methane emissions from organic waste and replaces fossil gas. Every unit of green gas used prevents the same amount of carbon emissions from standard natural gas.

Contribution to Reducing Carbon Footprint

100Green’s renewable energy genuinely shrinks carbon footprints for businesses. They provide carbon impact calculations based on your actual usage and verified emission data.

Their annual sustainability reports show total carbon savings across all customers. These numbers highlight both collective and individual business progress towards climate goals.

They offer carbon reporting tools that fit with existing business management systems. Companies can track monthly reductions and see how they’re moving towards science-based targets.

100Green’s supply typically cuts business carbon footprints by 40-60% compared to standard tariffs. That’s a big help for companies working on sustainability strategies and regulatory compliance.

Tariffs and Pricing for Business Customers

100Green offers fixed and variable business tariffs with no exit fees, but pricing is quote-based and typically higher than market averages due to genuine renewable sourcing.

100Green offers a range of fixed and variable tariffs with no early exit fees. Businesses get 100% renewable electricity and green gas, all with transparent pricing.

Available Business Tariffs

100Green keeps things simple with fixed and variable rate tariffs. Fixed tariffs lock in your rates for set periods, protecting you from price hikes.

Variable tariffs are more flexible, but rates can change with the market. All tariffs come with no exit fees, so you can switch if you need to.

They avoid complex tariff structures. This makes it easier for businesses to understand costs and plan ahead.

100Green remains the only UK supplier giving 100% green gas and renewable electricity together. That’s a big draw for businesses with strong sustainability targets.

Options for Smart Meter and Economy 7

100Green was the first to launch smart meter tariffs with time-of-day pricing. This allows businesses to take advantage of different rates throughout the day.

Smart meters let businesses track energy use in real time. That makes it easier to spot peak periods and save money.

They offer tariffs designed for smart meters. Businesses can get lower rates during off-peak hours when prices are usually cheaper.

Economy 7 options are available for businesses with the right usage patterns. These tariffs offer cheaper overnight rates for operations that can shift energy use to late hours.

Pricing Structure and Value for Money

100Green runs with an Ofgem price cap derogation due to its ultra-green business model. That reflects the extra costs of supplying 100% green energy.

The green gas comes with extra certification costs, so prices are higher. Still, businesses pay these premiums for the guarantee of real renewables.

Unit rates and standing charges vary based on your business size and usage. Quotes are tailored to each business rather than using standard published rates.

100Green aims for fair pricing on sustainable energy. Bills are transparent, with no hidden fees or complicated charges that some suppliers sneak in.

Customer Service and Support Experience

100Green ranked #1 for customer service by Citizens Advice in Q1 2025 (3.9/5), with just 3.7 complaints per 10,000 customers and 17-second average call wait times.

100Green ranked #1 for customer service in the Citizens Advice Q1 2025 survey, scoring 3.9 out of 5 – though they slipped to #3 (3.8/5) by Q3 2025. They offer several ways for businesses to get in touch and keep response times short.

Business Customer Support Channels

100Green gives business customers a few ways to reach their team. The main line is 01920 486 156, and there’s a freephone at 0808 175 4975.

Support runs Monday to Friday from 8am to 8pm. Weekend hours are shorter, from 9am to 1pm on both Saturday and Sunday.

Available Contact Methods:

• Telephone support with direct and freephone numbers
• Email support at the customer services address
• Web chat functionality
• Ring back service for convenience
• SignVideo for accessibility

They don’t offer mobile hotline or Minicom/text support, but ring backs and SignVideo make things more accessible.

Most emails get answered within two working days, with 95.6% handled in that time. The average call wait is only 17 seconds, which is much faster than the big suppliers.

Quality and Reputation of Service

Citizens Advice ranked 100Green #1 in their Q1 2025 report, though they dropped to #3 by Q3 2025. They scored perfectly on complaints and contact waiting times.

100Green picked up a 5 out of 5 for receiving the fewest complaints per 10,000 customers. They also got full marks for quick contact response.

Recent Performance Metrics:

• Citizens Advice rating: 3.9/5 (Q1 2025), 3.8/5 (Q3 2025)
• Complaint rate: 3.7 per 10,000 customers
• Average call wait: 17 seconds
• Email response rate: 95.6% within 2 days

Which? named 100Green a “recommended” energy supplier, and only four UK suppliers received that nod.

Even as a smaller supplier, they keep a premium service. Reviews often mention helpful staff and fast problem solving by phone and email.

Dealing with Complaints and Issues

100Green handles complaints and issues quickly. They get far fewer complaints than the bigger names.

With just 3.7 complaints per 10,000 customers, they’re well below industry averages. This low rate suggests they’re doing something right.

Complaint Resolution Features:

• Fast responses across all channels
• Phone-based problem solving
• Polite staff
• Efficient resolution processes

Business customers share positive experiences with complaints. 100Green prefers to resolve things over the phone, which usually gets things sorted faster.

Staff get trained to handle issues professionally and courteously. Being a small company, they can give more personal attention and make decisions quickly.

Their focus on phone calls rather than endless email threads helps resolve business issues efficiently. It’s a refreshing change from the slower service you get with some bigger suppliers.

Technology and Metering Solutions

100Green provides free smart meter installation for business customers, with time-of-use tariffs and prepayment meter options, though their mobile app receives mixed reviews.

100Green installs smart meters for business customers free of charge and supports prepayment meter options. Their metering solutions focus on what works, not flashy tech.

Smart Meter Implementation

100Green gives free smart meter installations to business customers who switch. That’s a real saving, since some suppliers charge for it.

Their own technical team handles installation. Customers say the service is reliable, and there aren’t extra charges.

Smart meters from 100Green offer basic automated readings, so you don’t have to do manual meter checks or get stuck with estimated bills.

The mobile app, though, gets poor reviews. Users call it “frustrating” for tracking usage, which limits the smart meter’s digital benefits.

The smart meters link up with 100Green’s billing systems to ensure accurate bills based on what you actually use.

Prepayment Meter Support

100Green supports prepayment meters for businesses who want them. They can fit these meters if you need to manage credit or prefer pay-as-you-go.

Prepayment meters give businesses control over energy spending and help avoid big unexpected bills.

They’ll fit prepayment meters if you have payment difficulties or credit concerns. It’s a way to keep the supply running and manage cash flow.

No security deposits are charged when they install prepayment meters, so it’s a cost-effective option for businesses with credit limits.

The prepayment system works for both gas and electricity. You just top up as needed to keep your supply going.

100Green’s Suitability for Different Business Types

100Green suits eco-conscious SMEs, professional services and retail businesses best; high-energy manufacturers may find the green premium too costly.

100Green fits best for companies that really care about environmental responsibility and can handle higher costs. Businesses with huge energy needs might find the switch expensive.

Best Fit: Environmentally Conscious Businesses

Companies that put sustainability first will find 100Green lines up with their values. The supplier offers 100% renewable electricity and green gas, so businesses can cut their carbon footprint in a big way.

Retail and hospitality businesses get a real marketing boost from 100Green’s credentials. Customers are looking for greener businesses, and this partnership helps.

Professional services firms like consultancies and law firms are a good match. These companies usually have moderate energy needs and can afford to pay a bit more for green energy.

Technology companies often choose 100Green to hit their sustainability targets. Many tech firms are working towards carbon neutrality, and using renewables helps tick that box.

Small to medium businesses with a sustainability mission find 100Green especially valuable. The supplier’s ethical approach matches their values, and it gives them a genuine story to share with their customers.

Considerations for Businesses with High Energy Use

Manufacturing companies and heavy industry often struggle with 100Green’s pricing. Green energy usually costs more than standard options.

High-consumption businesses can see their energy bills go up quite a bit. If you’re running a data centre or server farm, it’s worth running the numbers before making the switch.

These operations run 24/7 and use a huge amount of electricity. The premium for renewable energy can hit your bottom line pretty hard.

Large warehouses and distribution centres also need to look closely at energy budgets. Heating and cooling those massive spaces takes a lot of power.

The price gap between green energy and standard tariffs gets bigger the more you use. Still, some high-usage businesses pick 100Green for regulatory compliance.

Government contracts are starting to demand proof of environmental responsibility from suppliers. For some, paying the green premium is the price of entry for these deals.

Companies can soften the blow of higher costs by improving energy efficiency. Using less power and going green at the same time keeps costs under control.

Market Comparison and Independent Recognition

100Green is the only UK supplier offering 100% green gas, and holds Which? Recommended Provider status for 2025 and 2026 – one of just four suppliers to earn it.

100Green stands out among UK suppliers as the only one offering 100% green gas. It’s picked up top marks from consumer groups like Which? and Citizens Advice.

Comparison with Other UK Green Energy Suppliers

100Green fills a unique spot in the UK’s green energy market. It’s the only supplier to offer 100% green biogas made from agricultural waste using anaerobic digestion.

Most competitors stick with carbon offsetting for their green gas. Ecotricity gives you 100% renewable electricity and is moving towards green gas, but they’re not all the way there yet. Good Energy sells renewable electricity and carbon-neutral gas, but that gas is a blend of biogas and offset natural gas.

100Green’s genuine green gas supply sets it apart from every other UK supplier. They don’t bother with offsetting schemes since they get gas straight from renewable sources.

Prices sit above market averages, reflecting the higher cost of truly green energy. It’s not the cheapest, but you get what you pay for.

Awards and Accolades

100Green gets recognition from respected consumer organisations. Citizens Advice ranked them #1 out of 16 suppliers in their January-March 2025 survey, with an overall score of 3.9 out of 5 stars.

Which? named 100Green a Recommended Provider for 2025 and 2026 – one of only four UK suppliers to earn that status. The company scored 70% overall and got a 76% customer score, especially for customer service and complaint handling.

Average call centre wait times are just 17 seconds, which is much better than most of the industry. On Trustpilot, 100Green holds a 4.3 out of 5 star rating from over 1,300 reviews, with 72% rated five stars.

Customers often mention the friendly and efficient UK-based customer service team

For more on this topic, see our guides to business energy costs, top energy suppliers, and Scottish Power review.

Tom Reynolds

Business Energy Specialist

Tom focuses on commercial energy, renewable adoption, and sustainability strategy for SMEs. His background with UK energy suppliers helps businesses cut costs while meeting carbon targets.

Reviewed by

Laura Bennet

Home Energy & Sustainability Editor