How does your non-domestic supplier stack up?

Our new non-domestic energy supplier performance league table compares how energy companies rank on handling complaints from best to worst.

This should help you understand how your current provider performs and make decisions about switching.

Energy supplier performance from January to March 2025

Table showing rankings for energy supplier performance, published June 2025.

Table showing rankings for energy supplier performance, published September 2025
Rank Supplier Apr-Jun 2025 Jan-Mar 2025
Rank

1

Supplier

Crown Gas and Power

Apr-Jun 2025

5.7

Jan-Mar 2025

0.0

Rank

2

Supplier

Ecotricity

Apr-Jun 2025

23.8

Jan-Mar 2025

100.3

Rank

3

Supplier

Tomato

Apr-Jun 2025

81.5

Jan-Mar 2025

134.3

Rank

4

Supplier

E.on

Apr-Jun 2025

108.6

Jan-Mar 2025

106.9

Rank

5

Supplier

Total Gas and Power

Apr-Jun 2025

148.8

Jan-Mar 2025

114.8

Rank

6

Supplier

British Gas

Apr-Jun 2025

156.0

Jan-Mar 2025

194.4

Rank

7

Supplier

Octopus Energy

Apr-Jun 2025

167.3

Jan-Mar 2025

294.1

Rank

8

Supplier

Scottish Power

Apr-Jun 2025

230.5

Jan-Mar 2025

281.6

Rank

9

Supplier

EDF

Apr-Jun 2025

293.5

Jan-Mar 2025

294.9

Rank

10

Supplier

Ruby Energy

Apr-Jun 2025

330.4

Jan-Mar 2025

234.5

Rank

11

Supplier

SmartestEnergy Business

Apr-Jun 2025

396.1

Jan-Mar 2025

440.6

Rank

12

Supplier

SSE

Apr-Jun 2025

470.4

Jan-Mar 2025

597.6

Rank

13

Supplier

Yu Energy

Apr-Jun 2025

499.4

Jan-Mar 2025

320.5

Rank

14

Supplier

Pozitive Energy

Apr-Jun 2025

558.5

Jan-Mar 2025

484.2

Rank

15

Supplier

Corona Energy

Apr-Jun 2025

562.3

Jan-Mar 2025

451.0

Rank

16

Supplier

Engie 

Apr-Jun 2025

1193.3

Jan-Mar 2025

1373.3

Rank

17

Supplier

Maxen Power

Apr-Jun 2025

2282.4

Jan-Mar 2025

2275.0

** Suppliers marked with this sign are new entrants to the non-domestic league table as of January 2025.

Citizens Advice has a statutory remit to publish the energy supplier performance data. Citizens Advice took over this role on 1 April 2014 when Consumer Futures became part of Citizens Advice and Citizens Advice Scotland. In May 2015 we consulted with suppliers regarding a similar process for the non domestic market and following some testing, we published the first comparison in January 2017.

You can download a copy of past energy supplier performance statistics. 162 KB

Weightings

Methodology

Citizens Advice has a statutory remit to publish the energy supplier performance data. Citizens Advice took over this role on 1 April 2014 when Consumer Futures became part of Citizens Advice and Citizens Advice Scotland. In May 2015 we consulted with suppliers regarding a similar process for the non domestic market and following some testing, we published the first comparison in January 2017.

The performance model represents weighted complaints made to the independent bodies, who are Citizens Advice Consumer Service, The Extra Help Unit, and Ombudsman Services:Energy

Weightings have been allocated to reflect the seriousness of the complaint and the time and effort spent by the consumer to get their problem resolved. The weightings in the model place greater emphasis on situations where the consumer has had to repeatedly contact their supplier, or another agency, because the company had failed to deal with their problem. The measures used in the model are outlined below along with their weightings.

Table showing methodology and weighting when assessing complaints for energy supplier performance
Case type Definition Weighting
Case type

Citizens Advice Consumer Service advice only / company referral cases

Definition

These are cases where a consumer has: sought independent advice or help (not information) from Citizens Advice Consumer Service. (Please note that due to data protection issues it is not possible for suppliers to have full visibility of these cases.) Or Been referred to the supplier via the company referral process.

Weighting

10

Case type

Complaints received by Extra Help Unit*

Definition

These are complaints from vulnerable consumers that have been referred from Citizens Advice consumer service to the Extra Help Unit (EHU) where a consumer who is vulnerable, has been disconnected or is at risk of disconnection or needs support due to the complexity of the case and has previously tried to resolve their complaint with their supplier and has been unable to do so.

Weighting

25

Case type

Cases received by Ombudsman Services: Energy

Definition

These are cases accepted by Ombudsman Services: Energy, the industry alternative dispute resolution scheme, because the consumer has been unable to get their complaint resolved for more than eight weeks.

Weighting

30

Calculation of ratios

The number of non-domestic cases received about each company in each of the categories are multiplied by the weighting factor and then divided by each company’s number of non-domestic customers. (Customer numbers provided by suppliers as part of a recurring request for information)

The figure is then multiplied by 10,000 to give a ratio per 10,000 customers.

The total measures for each company are then combined to produce an overall ratio. The ratios are produced on a quarterly basis.

Notes

  1. SSE data includes Atlantic, Scottish Hydro Electric, Southern Electric, SWALEC, and Unicom

  2. Consumer Futures created a proxy for performance based on the number of consumers that have contacted an independent organisation for advice or support with an energy problem. The companies have been ranked on the number of customer contacts to Citizens Advice consumer service, The Extra Help Unit and the Energy Ombudsman in relation to their market share during the last quarter.

  3. You can check details of the consultation and check the decision document.

  4. The different types of complaint have been weighted to reflect the seriousness of the complaint and the time and effort spent by the consumer to get their problem resolved. See the methodology section for full details of the model.

Footnotes

*On 1 April 2014, the Extra Help Unit became part of Citizens Advice Scotland. The team is based in Glasgow but provides a GB wide service.