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It does this by agreeing a fixed price - or strike price - that they will be paid for each unit of electricity they generate for 15 years into the future.

If the wholesale price is below this fixed price, the renewable generator gets paid a top up by a government-owned company; if the wholesale price is above the strike price, the generator pays the difference back.

The unit lost more than $5bn, largely thanks to rising costs on fixed price military contracts.

Represented by Top Class Actions of Santa Monica, California, the lawsuit alleges that McDonald’s misleadingly advertises breakfast combos with orange juice at a fixed price but then imposes a hidden surcharge.

Northrop received a $935-million fixed price contract to build the module in 2021 and took a $42-million charge in last year’s fourth quarter because of higher expenses, raising its 2023 program charges to $100 million.