100Green (formerly Green Energy UK)

Trading

Trustpilot: 4.6 out of 51,573 reviews
Citizens Advice: 22.8 complaints per 10,000 customersApril to June 2026 (domestic table)
Fuel mix: 100% renewable electricity1 April 2024 - 31 March 2025

100Green is the trading name of Green Energy (UK) Limited, an independent supplier based in Ware, Hertfordshire, that has supplied homes and businesses since 2001. It supplies 100% renewable electricity and offers 100% green gas. Business prices are quoted individually and are not published on its website.

Key facts

Legal name: Green Energy (UK) Limited
Company number: 04194006
Company status: Active
Incorporated: 4 April 2001
Registered office: Black Swan House, 23 Baldock Street, Ware, Hertfordshire, SG12 9DH
Website: https://100green.com
Phone: 01920 486 156
Email: business@100green.com
Ofgem supply licence: Yes
Fuel mix: 100% renewable electricity (1 April 2024 - 31 March 2025)
Trustpilot: 4.6 out of 5, 1,573 reviews
Citizens Advice complaints: 22.8 complaints per 10,000 customers (April to June 2026 (domestic table))
Citizens Advice rank: 2

Tariffs

Fixed-price business electricity (100% renewable)
Fixed-price business gas (100% green gas available)
100 Origin / EKO eco-labelled tariff (open to businesses on enquiry)
Online quote for microbusinesses (under 100,000 kWh electricity or 293,000 kWh gas a year)

Smart meters: Yes

Prices

Not published.

Switching

Business quotes come from 100Green's commercial team: email business@100green.com, call 01920 486 156, or use the online quote form. Microbusinesses using under 100,000 kWh of electricity or 293,000 kWh of gas a year can get an online estimate. The business page states there is no upfront payment, no account fees and no volume tolerance clauses, and that prices are fixed whatever the actual usage. Switching involves no supply interruption, meter change or site visit. Customers with large portfolios can get a dedicated account manager.

Sources

Checked September 2026