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 June 2026

* Due to Total Gas and Power’s failure to submit customer numbers since April 2026, it has not been possible to include them in the latest league table. In the January - March 2026 version of this table, they held position number 5.

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. 170 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.

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.