UK domestic energy supplier

Green Energy UK UK

Q: How do I switch to Green Energy UK?

Switching to Green Energy UK takes about five working days under the new Faster Switching service, and your supply is never interrupted. Sign up online with your address, postcode and a recent meter reading. Green Energy UK will arrange the transfer with your current supplier, including the final meter reading and the closing bill.

Q: Are there exit fees on Green Energy UK tariffs?

Most UK fixed-term tariffs include an exit fee (typically £25-£75 per fuel) if you switch before the contract ends. You can switch without an exit fee in the last 49 days of your contract. Variable tariffs (including the default tariff capped by the Energy Price Cap) have no exit fees.

Q: How do I contact Green Energy UK customer service?

You can reach Green Energy UK on 01920 486 156, Mon-Fri 8am-8pm, Sat-Sun 9am-1pm. For a full breakdown of phone lines (emergency, prepayment, HomeCare, bereavement, Welsh, Relay UK), see the Green Energy UK contact page.

Founded in 2001 and headquartered in Ware, Hertfordshire, Green Energy UK supplies gas and electricity to UK households. Compare tariffs, customer service, complaints and ownership below.

See Green Energy UK tariffs Contact Green Energy UK

Founded 2001 ~40,000 households Ware, Hertfordshire

Founded

2001

Years on the UK market

Customers

~40,000 households

Households served

Employees

Under 100 staff

Workforce size

About

Who is Green Energy UK?

Registered as Green Energy (UK) plc, Green Energy UK uses this legal name for Ofgem licence filings, contracts and any formal communications. The trading name customers see on bills is the shorter, more recognisable form.

The company is headquartered in Ware, Hertfordshire, where it runs its senior management, customer operations and regulatory liaison with Ofgem.

Green Energy UK was established in 2001. A longer track record means more years operating under Ofgem rules and a wider history of customer feedback, billing systems and regulatory interactions.

Green Energy UK operates independently — it is not part of a larger corporate group. This typically means faster decision-making but less wholesale-market scale.

The company is regulated by Ofgem, the UK's energy regulator, and its complaint handling falls under the Energy Ombudsman alternative dispute resolution scheme.

Fuel mix

Green Energy UK electricity fuel mix (2024-25)

Green Energy UK sources 100% renewable electricity from 650 small UK generators — biomass, anaerobic digestion, small-scale hydro, wind, solar PV, waste-energy and combined heat and power. All gas is certified green gas, primarily from anaerobic digestion of food and farm waste. No nuclear, no fossil fuels in the published fuel mix.

Renewable 100%
Nuclear 0%
Natural gas 0%
Coal 0%
Other 0%

Current tariffs

Green Energy UK tariffs: as of May 2026

Green Energy UK operates under an Ofgem derogation. Its tariffs sit above the Energy Price Cap because the cost of buying 100% renewable electricity AND 100% certified green gas on the wholesale market exceeds the capped level. The premium funds 100% green generation procurement, not commodity profits.

Green Energy UK domestic and business tariff unit rates as of May 2026
Tariff	Type	Unit rate	Standing	Effective
Sparkling Guarantee — March 2026 Annual estimate ~£2,058 for a medium-usage dual-fuel home (Ofgem TDCV: 2,700 kWh electricity + 11,500 kWh gas). 100% renewable electricity, 100% certified green gas. No exit fee. Term: Fixed term to March 2026, variable price · no exit fee	Variable	6.85 p / kWh	32.50 p/day	1 Mar 2026
Sparkling Variable (SVT) Default variable tariff with no end date — switch out any time with no penalty. Annual estimate ~£2,062 for a medium dual-fuel home. 100% renewable electricity, 100% certified gree... Term: No fixed term — ongoing · no exit fee	Variable	6.90 p / kWh	32.50 p/day	1 Mar 2026
EKO Energy 2026 Premium fixed tariff — electricity is third-party certified to the EKOenergy ecolabel (stricter than REGO alone). Annual estimate ~£2,229 for a medium dual-fuel home. Best for buye... Term: 12 months, fixed price · no exit fee	Fixed	7.40 p / kWh	32.50 p/day	1 Mar 2026
TIDE — Time of Use Three-rate time-of-use tariff: cheap overnight (midnight-7am, "low tide"), expensive at peak (4pm-8pm weekdays, "high tide"), standard the rest of the time. Designed for EV drivers... Term: Multi-rate, SMETS2 smart meter required · no exit fee	Variable	11.50 / 28.40 / 48.00 p / kWh	54.20 p/day	1 Mar 2026
Sparkling Economy 7 Sparkling Variable on a legacy Economy 7 meter — separate day and night unit rates, 7-hour cheap window (typically midnight-7am). Best for storage-heater households on an Economy 7... Term: Two-rate (day/night), no fixed term · no exit fee	Variable	6.90 p / kWh	32.50 p/day	1 Mar 2026

Open the full Green Energy UK tariffs page

Regulator

Who regulates Green Energy UK?

Independent watchdog responsible for licences, price approvals and customer-protection rules.

Complaints escalation (ADR): Energy Ombudsman
Companies House: 04077289

Timeline

Green Energy UK — key dates

A short timeline of the Green Energy UK brand — founding, milestones, regulatory events.

2001
Doug Stewart founds Green Energy (UK) plc in Ware, Hertfordshire, to supply 100% renewable electricity sourced from small UK generators.
2010
Wins Cisco Customer Kings "Winner of Winners" award for customer service.
2017
Launches the TIDE time-of-use tariff (peak 4-8pm weekdays, off-peak midnight-7am) — among the first UK suppliers to offer dynamic pricing.
2017
Becomes the only UK domestic supplier to offer 100% certified green gas alongside its renewable electricity (gas sourced from biomass and anaerobic digestion).
2021
Granted an Ofgem price-cap derogation: tariffs sit above the standard cap because the cost of buying 100% green energy on the wholesale market exceeds capped levels.
2021-2023
Which? Eco Provider badge awarded three years running.
2022
Rebrands the customer-facing trading name to "100Green" (legal entity remains Green Energy (UK) plc).
2025
Ranked #1 of 16 UK domestic energy suppliers by Citizens Advice for customer service (Q1 2025, 3.9/5).
2026
Named a Which? Recommended Provider — one of only four UK suppliers to earn the badge for the 2026 cycle.

Recognition

Green Energy UK awards & accreditations

Independent badges that tell you whether a supplier walks the talk on price, service and sustainability.

Which? Recommended Provider

2026

One of only four UK energy suppliers to earn the Which? Recommended Provider badge for the 2026 cycle (76% customer score, 70% total score).

Citizens Advice — #1 for service

Q1 2025

Ranked #1 of 16 UK domestic suppliers in the Citizens Advice quarterly star rating (3.9 / 5). Slipped to #3 (3.8 / 5) by Q3 2025 — still in the top tier.

Trustpilot rating

2025-26

4.2 / 5 from 1,300+ reviews (Dec 2025) — well above the UK domestic-supplier median. Reviewers consistently praise the UK-based customer-service team.

Ethical Consumer — "#1 Best Buy"

2023-24

Recognised as the top ethical energy supplier by Ethical Consumer Magazine for the depth of the renewable commitment (100% green gas + electricity).

Good Shopping Guide

2023

Listed as the top ethical energy supplier in the UK by the Good Shopping Guide on independent ethical-business criteria.

Which? Eco Provider

2021-2023

Awarded the Which? Eco Provider badge three years running for genuine renewable supply (not greenwash REGO matching).

Cisco Customer Kings

2010

"Winner of Winners" award for customer service across all participating UK SMEs.

Save up to £300 per year

Independent comparison

Is Green Energy UK the cheapest option for your home?

UK households can save up to £300 per year by switching to a supplier whose tariffs fit their actual gas + electricity usage. Compare against suppliers regulated by Ofgem in under two minutes.

Compare UK suppliers

Common questions

Green Energy UK — frequently asked questions

Green Energy UK is regulated by Ofgem and operates under a standard domestic-supply licence. Whether it is the right supplier for your household depends on your unit rate, standing charge, customer-service rating and any add-on services (HomeCare, Warm Home Discount eligibility). Always quote your annual kWh consumption when comparing prices — the headline rate alone does not predict your bill.

Switching to Green Energy UK takes about five working days under the new Faster Switching service, and your supply is never interrupted. Sign up online with your address, postcode and a recent meter reading. Green Energy UK will arrange the transfer with your current supplier, including the final meter reading and the closing bill.

The UK grid is supplied by a mix of gas, nuclear, wind, solar, biomass and imports. Green Energy UK declares its fuel mix annually under Ofgem rules — see the fuel-mix section above for the current figures. Some tariffs are sold as 'green' or '100% renewable', which means the supplier matches your annual consumption with renewable electricity certificates (REGOs) rather than physically delivering renewable electrons to your home.

Most UK fixed-term tariffs include an exit fee (typically £25-£75 per fuel) if you switch before the contract ends. You can switch without an exit fee in the last 49 days of your contract. Variable tariffs (including the default tariff capped by the Energy Price Cap) have no exit fees.

You can reach Green Energy UK on 01920 486 156, Mon-Fri 8am-8pm, Sat-Sun 9am-1pm. For a full breakdown of phone lines (emergency, prepayment, HomeCare, bereavement, Welsh, Relay UK), see the Green Energy UK contact page.