British Gas owner Centrica and rival energy giant SSE unveil their latest financial figures amid a political storm over inflation-busting tariff hikes for households.
The suppliers are under pressure over the increases after Labour challenged the Government by pledging to freeze tariffs if it wins power.
Amid the ongoing furore, Centrica chief executive Sam Laidlaw has decided not to take his bonus this year, which could be worth up to £1.7 million.
He announced his decision after British Gas revealed last month that electricity bills were to rise by 10.4% and gas tariffs by 8.4%. The move affected 7.8 million households.
The company says average 5% profit margins from its residential arm are fair and used to fund investments - and that the business would be loss-making in 2014 if it did not raise prices to cover costs.
Half-year profits from the division this year rose 3.2% to £356m. Adjusted operating profits at parent Centrica were up 9% to £1.58 billion. The company will unveil third quarter trading figures on Thursday.
SSE, the first of the major suppliers to announce a tariff rise, updates the market on Wednesday with half-year results. In a trading update earlier this year, it revealed that it made a loss on its retail operations in the six months to the end of September as wholesale prices rose.
Analysts at Exane BNP Paribas expect to see a loss of £100m for the division over the period this year, and group pre-tax profits down 19% to £321m.
Vodafone will unveil half-year results on Tuesday, Sainsbury's is expected to report strong half-year figures on Wednesday and mobile phone retailer Carphone Warehouse publishes interim results on Thursday.
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