TL;DR
- E.ON Next scored 3.55 out of 5 in the Q4 2025 Citizens Advice supplier rating, placing it in the middle of the major supplier pack.
- Complaint themes for 2025-26: smart meter install delays, direct debit calculations, time-of-use band billing errors on Drive and Pulse, and switch-in pricing disputes.
- The internal escalation route is the Resolver Team, reachable through the customer portal or by email. The team handles most non-routine cases.
- The Energy Ombudsman route opens after 8 weeks unresolved or with a deadlock letter. Typical awards: financial correction plus £30 to £150 goodwill.
- E.ON Next's smart meter install backlog has been a recurring complaint driver. Customers waiting more than 12 weeks can use the Ombudsman route to push for resolution.
Last reviewed: May 2026
E.ON Next is the consumer-facing brand of E.ON UK, rebuilt after the 2021 NPower acquisition. The customer base is large enough to produce a steady complaint volume; the service quality is mid-pack. Internal escalation works for most cases. The supplier's published response times are reasonable, the Resolver Team is reachable, and the Ombudsman escalation route is used less frequently than at British Gas or Scottish Power on a per-customer basis.
Complaint themes for 2025-26
The Citizens Advice Q4 2025 rating put E.ON Next on 3.55 out of 5, the second-best score among large suppliers behind Octopus. The dominant complaint themes, based on the same dataset and E.ON Next's 2025 customer service KPI report, fall into four clusters.
Smart meter install delays account for around 30% of complaints. The supplier's published lead time of 12 to 16 weeks is sometimes overrun, particularly during seasonal demand peaks. Direct debit calculations and disputed increases come second, around 20%. Time-of-use band billing errors on Drive and Pulse account for around 15%, particularly cases where the meter mode flip did not complete cleanly and consumption was billed entirely at peak rates. Switch-in pricing disputes, where the rate quoted on switch differed from the actual rate applied, account for around 10%.
Less common but harder to resolve are cases involving the post-acquisition migration from NPower legacy systems. A small cohort of customers transferred to E.ON Next still have data quality issues that surface as billing inconsistencies. These cases sometimes require manual back-office intervention.
The supplier has three contact routes that all reach the same back-office.
First-line contact
E.ON Next runs four customer service channels. Online chat through the customer portal is the fastest for first contact. Email to hi@eonnext.com reaches the same queue with a slightly slower response time. Phone calls are available but the call centre has been the supplier's weakest channel on responsiveness. The customer portal has a message function that creates a documented thread.
The supplier's published target is 5 working days for a first response. Online chat typically responds within a few hours during business hours. The email turnaround averages 2 to 3 working days.
The chat-plus-email combination produces the best paper trail. Customers who open with chat for speed and follow up with email to summarise the conversation tend to get faster resolution than customers who only use one channel.
The Resolver Team and internal escalation
If the first-line response does not resolve the issue, customers can request escalation to the Resolver Team. This is E.ON Next's complaint-handling team with authority to issue goodwill payments, override automated direct debit changes, correct billing errors, and arrange engineer or meter work with priority.
Reaching the team requires explicit request: "please escalate this to the Resolver Team" in the chat or email thread. Some frontline agents will resolve internally before referring, which is fine, but persistent issues should move to the Resolver Team within 1 to 2 follow-up exchanges.
The Resolver Team responds within 5 working days on average. Most cases close within 2 to 3 weeks of being raised with the team. Where the case requires DCC, meter, or third-party action, the timeline can extend; the customer should ask for a target resolution date in the first contact.
The deadlock letter and the 8-week clock
If escalation does not resolve, E.ON Next can issue a deadlock letter. The letter is a formal acknowledgement that internal routes are exhausted and the customer can refer to the Energy Ombudsman. Customers can also refer after 8 weeks without a deadlock letter under the standard Ofgem licence condition.
The 8-week clock starts on the first written complaint. Emails to a generic address, chat transcripts, and portal messages all count. Customers should ensure the complaint is documented in writing (not just by phone) to start the clock cleanly.
Customers should ask for the deadlock letter explicitly if escalation has stalled. The supplier occasionally delays issuing it; the letter is a customer right and should be granted on request when the case is genuinely deadlocked.
Energy Ombudsman submission and outcomes
The Energy Ombudsman is the independent dispute resolution body. Submission is free. Cases against E.ON Next average 6 to 9 weeks from submission to decision, faster than the sector average.
| Outcome category | Typical range at E.ON Next cases | Note |
|---|---|---|
| Billing correction | Variable | Refund of overpayments; rebilling at correct rate |
| Goodwill / inconvenience | £30 to £150 | Median sits around £75 |
| Process change | Non-monetary | Where Ombudsman directs supplier action |
| Distress / vulnerable harm | £100 to £400 | Less common; reserved for serious cases |
E.ON Next implements Ombudsman decisions within the required 28 days in the majority of cases. The supplier's compliance rate on Ombudsman timelines is better than the sector average, based on the Energy Ombudsman's 2025 annual report.
Guaranteed Standards of Performance
Ofgem's automatic compensation regime applies to E.ON Next as it does to all suppliers. GSOP payments around £30 per failure are due for missed appointments, late switch refunds, and supply restoration delays. The rates were set in April 2024 and unchanged in the May 2026 review.
E.ON Next's automatic GSOP payment rate is above the sector average. Most triggers do produce automatic payments. Customers who experience a GSOP-eligible failure should still check that the payment arrives; reminders to the supplier resolve missed payouts.
For smart meter install delays specifically, the GSOP regime covers missed engineer appointments but not the original install lead time itself. A customer waiting 16 weeks for an install is not entitled to automatic GSOP for the wait; they would need to use the complaint and Ombudsman route to claim compensation for inconvenience.
Specific recurring issues
Three issues recur often enough to warrant specific guidance.
Drive and Pulse band billing errors. After a meter mode flip, some customers find that off-peak consumption was billed at the peak rate for the first few days. The fix is a manual rebilling correction; the Resolver Team can handle this in one exchange. The customer should provide the meter mode confirmation date and any half-hourly consumption data from the in-home display.
Smart meter install pauses. E.ON Next sometimes pauses install bookings while the DCC catches up on backlog. The customer waits longer than the published 12 to 16 week lead time. Escalation through the Resolver Team can re-prioritise the booking; the supplier publishes a backlog status page on the customer portal.
NPower legacy migration errors. A small cohort of customers transferred to E.ON Next from NPower in 2021-22 still have residual data issues. These typically surface as inconsistent meter reads, missing historical bills, or balance discrepancies. The fix is a manual back-office reconciliation; the Resolver Team can usually arrange this within 4 weeks.
Practical advice
In practice, the eight-week clock is the only deadline that matters to the Ombudsman, so log it from the date of the first written complaint and refer to it in every follow-up message.
Open the complaint in writing through chat or email, not by phone. Keep the case in one thread. Note dates and reference numbers for every interaction.
Request the Resolver Team explicitly if the first-line response does not resolve. Do not rely on the frontline to escalate automatically.
Be specific about the remedy sought. "Refund of £X plus a £Y goodwill payment for the time spent" is actionable. Generic dissatisfaction is not.
If the case involves a vulnerable customer, flag it explicitly. E.ON Next's vulnerability handling is competent when triggered.
Track the 8-week clock. If the case approaches 8 weeks without resolution, prepare to submit to the Energy Ombudsman with the complaint thread evidence.
The brand consolidation legacy at the supplier
E.ON UK acquired NPower's retail customer book in 2019 and completed the brand consolidation through 2021. The E.ON Next brand consolidated the consumer-facing operation around a single customer service platform. The migration brought several million NPower customers onto the E.ON Next systems.
For some of those customers the migration produced data quality issues that have persisted into 2026. Specific symptoms include inconsistent meter reading history, missing bills from the migration period, balance discrepancies between the old NPower system and the current E.ON Next system, and PSR profiles that were not transferred cleanly.
The supplier maintains an internal back-office team for legacy migration reconciliation. Customers who suspect their account holds residual migration issues should request a manual reconciliation through the Resolver Team. The process takes 4 to 8 weeks and typically resolves the disputed data without escalation to the Ombudsman.
For new E.ON Next customers (those who joined after 2022), the legacy migration issues do not apply. The customer service experience is generally smooth. The supplier's published 2025 service KPIs show response times and first-call resolution comfortably above the sector mean for non-legacy customers.
The lesson for any customer is to check account history within the first three months of joining. Anomalies are easier to resolve early than after years of accumulated billing.
Editorial disclaimer. Kaeltripton is an independent UK finance publisher. This article is general information for UK adults making their own decisions, not regulated financial advice. Complaint processes, GSOP rates, and Ombudsman timelines change. Figures reflect E.ON Next, Ofgem, Citizens Advice, and Energy Ombudsman publications dated before the last-reviewed date at the top of this page. For complaints, refunds, or vulnerable-customer protection the formal route runs through the supplier first and then the Energy Ombudsman.
FAQ
How quickly does E.ON Next respond to complaints?
Chat typically within a few hours during business hours; email within 2 to 3 working days. The published target is 5 working days for a first response.
How does a customer reach the Resolver Team?
Request escalation explicitly in the chat or email thread. The Resolver Team will pick up the case within a few working days.
What is the typical Ombudsman award against E.ON Next?
The median goodwill award is around £75, plus any required billing correction. PSR and vulnerable customer cases can attract higher awards.
Will the supply be affected by raising a complaint?
No. Supply continues unchanged regardless of the complaint status.
Is the complaint kept open after switching supplier?
Yes. The complaint continues against E.ON Next through the existing channel. Switching does not close the case.
Are former NPower customers still on NPower-era rates?
No. All customers have migrated to E.ON Next tariffs. Residual data issues from the migration occasionally surface but the live billing uses current E.ON Next rates.