Complain to 100Green
100Green complaints, formerly Green Energy UK: their complaints email, a 5 working day response target, and the free Energy Ombudsman route after 8 weeks.
UtilityContact emails
complaints@100green.com
Complaints
Common 100Green complaints
100Green ombudsman & regulator routes
Which ombudsman handles 100Green complaints?
Energy Ombudsman. Once 100Green’s own complaints process is exhausted (after 8 weeks or a deadlock letter), you can take your complaint there for free. Go to the ombudsman. Read our Energy Ombudsman guide.
Can you complain to Ofgem about 100Green?
Not for individual disputes: Ofgem sets the rules for the sector but does not resolve personal complaints or award compensation. Complain to 100Green directly first and keep written records, then escalate to Energy Ombudsman if it stays unresolved after 8 weeks or you receive a deadlock or final-response letter. You can still report 100Green to Ofgem to flag systemic problems, but that will not get your own money back.
Laws that protect you
Consumer Rights Act 2015
Utility services must be performed with reasonable care and skill.
Ofgem Standards of Conduct
Rules for fair treatment and accurate billing.
Tips for 100Green complaints
- Take regular meter readings and photos
- Keep copies of all bills and statements
- Energy companies must give notice before price increases
- You can switch supplier without penalty in most cases
- The Energy Ombudsman can help after 8 weeks
If 100Green doesn't respond
- 1
Customer Service
Allow 14 daysContact your energy supplier's customer service team
- 2
Formal Complaint
Submit a formal written complaint with your account number and meter readings
- 3
- 4
Contact emails
complaints@100green.com
Complaints
Expected response time
56 days
Energy suppliers have a statutory 8-week window before you can escalate to the Energy Ombudsman
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Frequently asked questions
Tools & guides for your 100Green complaint
Free calculators and explainers that strengthen the case you make to 100Green.
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Not sure what the law actually entitles you to? Start with our UK consumer rights guide - refunds, faulty goods, and how to enforce your rights under the Consumer Rights Act 2015.
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Create my 100Green complaintDisclaimer: NoReply is an independent consumer advocacy platform. We are not affiliated with, endorsed by, or connected to 100Green or any of the companies listed on this site. Contact information is sourced from publicly available company websites. Statistics shown are based solely on cases filed through our platform. This page is for informational purposes only and does not constitute legal advice.
Last reviewed: by NoReply Editorial