The owner of British Gas has said it will slash 5,000 jobs this year as the company tries to set a new course.
Centrica has announced it is stripping out three layers of management as part of its turnaround plan, in a bid to slimline the business and cut down on bureaucracy.
Around half of the 5,000 lost jobs will be among the company's leadership, management and corporate staff.
It includes half of the 40-strong senior leadership team who will step down by the end of August.
Centrica said most of the restructuring will take place in the second half of this year.
The firm has been in decline for several years, having lost half of its earnings in the last decade as smaller energy suppliers have taken customers from British Gas.
In April, the firm revealed it had put a pay freeze in place in a bid to cut costs.
The need to restructure has in part been accelerated by the impact of coronavirus.
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Chief executive Chris O'Shea said: "Since becoming Chief Executive almost three months ago, I've focused on navigating the company through the Covid-19 crisis and identifying what needs to change in Centrica.
"We've learnt through the crisis that we can be agile and responsive in the most difficult conditions and put our customers at the heart of our decision making.
"However, I believe that our complex business model hinders the delivery of our strategy and inhibits the relentless focus I want to give to our customers.
"We have great people, strong brands that are trusted by millions and leading market positions, but the harsh reality is that we have lost over half of our earnings in recent years.
"Now we must bring focus by modernising and simplifying the way we do business.
I truly regret that these difficult decisions will have to be made and understand the impact on the colleagues who will leave us.
"However, the changes we are proposing to make are designed to arrest our decline, allow us to focus on our customers and create a sustainable company."