New Prime Minister Liz Truss will limit energy bill rises for all households for two years as the new prime minister tries to prevent widespread hardship.
A typical household energy bill will be capped at £2,500 annually until 2024.
The huge support scheme could cost up to £150bn, but Ms Truss refused to put a figure on it, saying "extraordinary times call for extraordinary measures".
Businesses will get help, with prices capped for six months, a shorter period of protection than many had hoped for.
The help will be for everyone in England, Scotland and Wales with equivalent assistance for Northern Ireland.
Read more at: BBC