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By Daniel Thomas
Business reporter, BBC News
British Gas is to donate 10% of its profits to help customers cope with soaring bills for the "duration of the energy crisis".
Its owner Centrica says the money will go into an existing support fund - trebling help available this winter for the poorest customers.
The firm, which has seen huge profits this year, said thousands of households would get grants of £250-£750.
But this is a fraction of the support needed to tackle the crisis nationally.
Earlier this week, one power boss put that cost closer to £100bn.
British Gas's offer comes as the next energy price cap - which limits what suppliers can charge per unit of energy in England, Scotland and Wales - is set to be announced on Friday.
The typical home energy bill is forecast to reach £3,553 a year in October - up from £1,971 currently - with further rises forecast for January.
The government has promised a package of help but there have been warnings many people will fall into hardship without further support.
Energy firms are also under pressure to help after many posted soaring profits this year, due to record high energy prices driven by Russia's invasion of Ukraine.
British Gas's owner Centrica's saw adjusted operating profits of £1.34bn for the six months ending in June - up from £262m a year earlier.
However, the latest offer of support will based on British Gas's retail supply profits, which were just £98m.
The firm, which is Britain's leading energy supplier, serving more than nine million homes, said it had made an immediate donation of £12m to its Energy Support Fund. It added that it would continue donate around 10% of its supply profits every six months "for the duration of the energy crisis, backdated to the start of 2022".
'Difficult time'
Centrica boss Chris O'Shea said: "As a responsible business we want to do more to support our customers during this difficult time.
"This increased investment in supporting our customers adds to the financial support and advice we already offer and ensures more grants will be available as we go into this winter.
"We're proud to have put together a £25-plus million customer support package which will grow."
This week rival power company Scottish Power' proposed an industry wide scheme to freeze energy bills for two years.
Boss Keith Anderson said the £100bn plan would see the price cap frozen at the current level, with the government covering the difference between what people pay for energy and how much it costs to supply their homes.
The cost could then be repaid over the next 15 to 20 years and would be underwritten by the UK government.
Mr Anderson said he had submitted the idea to Business Secretary Kwasi Kwarteng and the government was "seriously considering" it.
So far the government has promised a £15bn package of support for UK households. This includes a £650 one-off payment for eight million low income households, and a change to the £200 loan scheme for energy bills for all homes in the autumn - increasing it to £400 without the need to pay it back.
Plans to enable households to get discounts on electricity bills if they cut use at peak times are also set to be announced by National Grid in the next two weeks.
However, this week the boss of Octopus Energy said that government support would need to be doubled or energy bills frozen to get hard pressed customers through the crisis.
Greg Jackson said: "You can't expect the energy customers, or indeed the retailers to carry the cost of a war."
No 10 previously said there would be no new support offered before a new PM is appointed on 5 September.
The current favourite to replace Boris Johnson, Liz Truss, has promised tax cuts and recently hinted at direct financial help for hard-pressed households.
Her rival, Rishi Sunak, has said he would introduce more targeted support for households, and has promised to reduce VAT on domestic energy bills from 5% to zero.