The price cap will fall from £2,074 to £1,923 for a dual fuel household paying by direct debit based on the current typical domestic consumption values (TDCV) rate.
Writing in the weekly Money Saving Expert’s Money Tips email, Mr Lewis explained the new energy price cap was falling on average by seven per cent.
People who pay energy bills by monthly direct debit and don't have a working smart meter may want to take a meter reading this week
He explained that the 90 per cent of homes in England, Scotland and Wales who are on a price-capped tariff could therefore pay less for the same energy they use.
The price cap is a limit on the standing charge and unit rates for firms’ standard tariffs, meaning people who use more energy will pay more.
Ahead of the price cap change, Mr Lewis said this week is “meter reading week”.
He said those with a working smart meter shouldn’t need to do anything, but those who don’t will need to act.
Writing in the newsletter, the financial journalist said: “If you don't have a smart meter, or it doesn't work, try to take a meter reading within a few days either side of the rate change (if after Sunday most let you backdate a few days) to reduce the risk of your supplier estimating you've used more at the higher rate than you actually have.
“Take a pic of the meter for extra peace of mind.”(sic)
He also warned that many should expect their bills to be “very similar” to last winter.
This is due to government support, such as the Energy Bill Support Scheme which provided a £400 discount on energy bills, having ended.
Speaking to MPs, Mr Brearley said: “When I look across the market this winter and I think about how does that play out for us this winter, I should start by saying we have a full focus on making sure customers are protected this winter.