The "big six" energy firms made an average profit margin of 20 per cent for energy generation in their last financial year, according to figures released by energy regulator Ofgem.
The results are likely to fuel further anger over rising gas and electricity bills.
The key figures included:
- Profits in the domestic supply business increased by 75 per cent
- Companies made on average £53 per customer each year
- Average profit margins increased from 2.8 per cent to 4.3 per cent in 2012
- The big six made an average profit margin of 20 per cent for energy generation in the last financial year
More top news
Antidepressants do help in combating the mental health condition, a new study has found.
A cold and frosty start to the day for many, with some patches of mist and fog in parts of central and northern England.
British Gas owner Centrica is set to cut a further 2,100 jobs as part of a cost-cutting process.