Trustpilot
4.2
/ 5
1,300 reviews
Customer reviews
Green Energy UK reviews
Independent Green Energy UK reviews drawn from Trustpilot, the Citizens Advice supplier-performance table and Selectra's editorial review — every signal you need to judge whether Green Energy UK is right for your home.
3.8
Average across platforms
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Independent ratings
How Green Energy UK scores across review platforms
Each platform measures a slightly different thing. Trustpilot reflects customer service. The Citizens Advice table is built from regulator-supplied complaint and switching data.
Citizens Advice
3.8
/ 5
Ranked #3 of UK suppliers
Apple App Store
4.2
/ 5
Google Play
2.9
/ 5
Pros & cons
What we hear from Green Energy UK customers
Strengths
- 100% renewable electricity AND 100% certified green gas — the only UK domestic supplier delivering both across its full range, sourced from ~650 small UK generators (biomass, anaerobic digestion, hydro, wind, solar).
- Which? Recommended Provider 2026 — one of only four UK energy suppliers to earn the badge for the 2026 cycle (76% customer score, 70% total score).
- Citizens Advice top tier — ranked #1 of 16 UK domestic suppliers in Q1 2025 (3.9/5) and #3 in Q3 2025 (3.8/5) for customer service quality.
- Trustpilot 4.2 / 5 from 1,300+ reviews — comfortably above the UK domestic-supplier median, with consistent praise for the UK-based customer-service team.
- £0 exit fees across the entire range — Sparkling Guarantee, Sparkling Variable, EKO Energy 2026, TIDE and Economy 7 all let you switch out with no penalty.
- TIDE multi-rate tariff with three time bands — cheap overnight (midnight-7am), peak 4-8pm weekdays — designed for EV drivers, home batteries and solar households able to load-shift.
- Ethical Consumer #1 Best Buy multi-year recognition, plus Which? Eco Provider 2021-2023 — the green credentials are independently audited, not greenwash REGO matching.
Weaknesses
- Tariffs sit above the Ofgem default tariff cap — Green Energy UK operates under an Ofgem derogation. Expect a premium of typically £150-£300 a year vs. the cheapest fixed deals; the premium funds 100% green procurement.
- No prepayment / pay-as-you-go meter option — credit billing only (direct debit, BACS or cheque). Households on legacy prepayment meters cannot switch in.
- No in-house boiler cover / HomeCare add-on — combine with British Gas HomeCare, HomeServe or your boiler manufacturer separately.
- The Android app is weak (2.9/5 on Google Play) vs. the iOS app (4.2/5) — meter reads and account changes work but the UX trails Big Six suppliers.
- Small operations team — under 100 staff serving the customer base. Phone hours are good (Mon-Fri 8am-8pm, weekends 9am-1pm) but no 24/7 live agent for non-emergency calls.
Selectra verdict
Our independent take on Green Energy UK
Green Energy UK (trading as 100Green) is the rare UK supplier whose green credentials are independently audited and structurally distinct from the REGO-matched "green" tariffs sold by the Big Six. The 100% renewable electricity comes from contracts with ~650 small UK generators, and the gas is the only 100% certified green domestic offer in the market.
The trade-off is the price-cap derogation. Expect to pay £150-£300 a year more than the cheapest fixed deal for the equivalent annual usage — the premium funds the green procurement rather than commodity hedging. For households whose values, EV/battery use case or 4pm-8pm load profile fit the TIDE tariff, the maths can work out neutral or positive. For everyone else, the supplier is paid as a deliberate ethical choice, not as a price-led one.
Verdict: recommended for households for whom genuinely green matters more than absolutely cheapest, and for EV/battery owners able to exploit the TIDE multi-rate tariff. The Which? 2026 RP badge, Citizens Advice top-3 score and Trustpilot 4.2/5 confirm the service quality is now genuinely top-tier.
Selectra explains
Green Energy UK's online presence: expert analysis
Author: Selectra UK energy team · Updated May 2026
Green Energy UK has rebuilt its online review footprint significantly since the 2022 rebrand to 100Green. Trustpilot now sits at 4.2/5 across 1,300+ reviews (up from 3.6/5 historically), the Citizens Advice quarterly table placed the supplier at #1 of 16 in Q1 2025 and Which? named it a Recommended Provider for the 2026 cycle. The TIDE tariff remains the strongest review driver among engaged early adopters.
Channel
Trustpilot
4.2/5
1,300+
Comfortably above the UK domestic-supplier median. 5-star clusters around the UK-based customer-service team and the TIDE tariff plus battery/EV use case. 1-star clusters are on out-of-cap price rises and the legacy Android app.
Channel
Citizens Advice (Ofgem-supplied data)
3.8/5
Quarterly regulator data
Top tier. Was #1 of 16 in Q1 2025 (3.9/5), slipped to #3 in Q3 2025 (3.8/5) — still well above the industry median. Complaint volume of just ~3.7 per 10,000 customers is among the lowest published.
Channel
Which? annual customer survey
76.0/5
Customer score (out of 100)
Named a Which? Recommended Provider for 2026 — one of only four UK energy suppliers to earn the badge. 70% total score, 76% customer score in the 2025 annual survey.
Channel
Apple App Store / Google Play
4.2 / 2.9/5
iOS / Android
iOS app well-rated (4.2/5); Android app under-invested (2.9/5). Both cover meter reads, bills and balance — Android UX is the weakest part of the digital stack.
Channel
Microgeneration & battery forums
Forums focused on home batteries, EV time-of-use and microgeneration speak well of the TIDE three-band tariff as one of the few alternatives to Octopus Agile available to UK households.
Channel
Reddit / r/UKPersonalFinance
Threads typically frame the supplier as "expensive but genuinely green". MoneySavingExpert flags the price-cap derogation as the single most important fact to understand before signing up — the headline price is unbound by the Ofgem cap.
Channel
X (Twitter) presence
Modest social presence under @100GreenEnergy. No high-volume support handle — customer issues route back to phone / email. Visibility on response times trails larger digital-first suppliers.
Selectra expert verdict
Reading every channel together
The honest bottom line: Green Energy UK is no longer a fringe niche supplier — the Which? 2026 RP badge, the Citizens Advice top-3 score and the 4.2 Trustpilot consolidate it as a top-tier service provider on every independent metric. The remaining question is price: the Ofgem derogation means tariffs sit £150-£300/year above the cheapest fixes. For households whose values, EV/battery use or load profile justify the premium, the package is now defensible without caveat. For everyone else, run a Selectra comparison on your real annual kWh before signing up.
Reviews don't pay the bill — the tariff does.
A great supplier still costs you money if you're on a bad tariff. Compare Green Energy UK against every other UK supplier on the price for your actual usage.
Common questions
Green Energy UK reviews — frequently asked questions
Green Energy UK is regulated by Ofgem and bound by the Standards of Conduct that protect domestic customers. Reliability is best judged against your own usage profile: read recent reviews, check the Citizens Advice star rating for Green Energy UK, and confirm the supplier's customer-service hours match when you actually need to call.
Trustpilot, Google Maps and app-store reviews reflect real experiences but are often skewed toward dissatisfied customers (people only post when something goes wrong). The most balanced single rating is Citizens Advice's quarterly supplier performance table, which scores all UK domestic suppliers on complaint handling, transfers, debt and communication — and is built from regulator-supplied data, not self-reported.
Confirm the unit rate (p/kWh) for both gas and electricity, the daily standing charge, the contract length, any exit fee (typical range: £25-£75 per fuel), and whether the deal requires a smart meter. Always cross-check the headline price against several other suppliers based on your actual postcode and annual kWh consumption from a recent bill.
If you're a current or former Green Energy UK customer, share your experience on Trustpilot UK (search the supplier name), Google Maps (write a review on the Green Energy UK business profile), or the Apple App Store and Google Play if you've used the mobile app. Selectra also collects independent reviews to help future customers compare suppliers objectively.