The business reporter is from the British Broadcasting Corporation.
The new Prime Minister will announce plans to limit energy bill increases on Thursday.
Firms are likely to get some relief as a result of the cap on household energy bills.
The government is expected to borrow at least £100 billion to pay for it.
In October, a typical household's annual gas and electricity bill is going to go up by over $4000.
Without help on soaring energy prices, lives will be at risk this winter, as people struggle to afford basic day-to-day living costs.
Wholesale gas prices have gone up due to the conflict in Ukraine which has reduced supplies of Russian gas.
Families and firms were worried about how they were going to make ends meet this autumn and winter.
"Putin's war in Ukraine and weaponisation of gas supply in Europe has made it clear that we must boost our long-term energy security and supply."
She promised to tackle the root cause of the problems so that they wouldn't happen again.
To limit the amount customers' bills go up by, the government is expected to compensate energy firms for the difference between the wholesale price and the amount they can charge customers.
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The huge support package will be funded by the government and will not be expected to be repaid by customers.
The final sum will be determined by the cost of energy on the international energy markets and whether additional support is offered to the most vulnerable households.
Labour leader Sir Keir Starmer called on the government to extend a windfall tax on gas and oil company profits to help pay for the package.
According to Sir Keir, energy producers will make over one hundred billion dollars in excess profits over the next couple of years.
The Labour leader asked if she was really telling them that she would leave the profits on the table and make working people pay for decades to come.
The government is planning to change the energy market. Senior officials have met with power companies to discuss how their contracts might be changed so the price cap doesn't funnel billions of pounds of taxpayers' money into the profits of suppliers.
Households are facing high energy costs. "warm banks" are community spaces for people who can't afford winter heating, while some teachers are warning of cuts to staff, school trips or courses because of rising costs.
From October, every household in the UK will be given a one-off £400 discount on their fuel bills.
More than eight million low-income households who receive benefits or tax credits will get a total of £650.
The price cap, which limits the maximum amount domestic customers can be charged for each unit of energy, will increase in October. An average household will pay over $4000 a year for their energy.
Businesses are not protected from energy prices. Many firms are facing higher energy bills than households, which could cause them to go under or cut wages.
Firms are expected to be helped by the new plan.
It's likely that the system to support business will be reviewed more often. The government could force energy firms to give specific reductions on the unit price of energy.
The British Chambers of Commerce warned that it remains to be seen if the plan goes far enough in supporting firms.
The cost of the government support package could go up to over 100 billion dollars if businesses are included.
The cost of UK government borrowing is at an eight year high, with the yield on 10-year bonds rising above 3%. The rise in yield is a sign that the government will have to borrow more. Future borrowing will be more expensive as a result.
Some economists think that plans to cap energy bills could mean that the cost of living will be less than previously thought.
The cost of living is increasing at a faster rate than it has in 40 years. The rise is due to the increase in energy prices.
Goldman said that a cap on energy bills could cause inflation to peak at 10.8% in October. Inflation is expected to slow to 2.4% by the end of the year.
According to the Bank of England, the plan could slow the rise in prices.
Both cautioned that there was uncertainty about what would happen once a cap is lifted.
The economists think that the UK will fall into a recession despite the energy support plan.
The Governor of the Bank of England said there was little that could be done to stop the UK entering a recession.
According to reports, Ms Truss is set to announce that she is scrapping the ban on frack which was put in place because it was causing earth tremors.
The controversial gas extraction technique involves drilling into the earth and directing a high pressure solution at a rock layer to release the gas inside.
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