The order includes the delivery of motors, generators, variable speed drives and low-voltage switchgear.

ABB says it will guarantee service and lifecycle management of the electrical equipment as well as service and support for motors from third-party vendors.

The firm will build up a spare parts inventory, workshop repairs, training and provide round-the-clock technical support both over the phone and on-site.

Spare parts and replacement systems are being procured this year, with training to begin soon after.

Prelude is 488 metres long, 74m wide, with a loaded displacement of 600,000 tonnes with the facility's deck longer than four football fields laid end to end.

Once towed to its location off the northwest coast of Australia, it will be attached to the underwater infrastructure in the Browse Basin. It is scheduled to remain there for up to 25 years without uncoupling for overhaul, or to take shelter from cyclones.

ABB's Discrete Automation and Motion division president Pekka Tiitinen said a reliable service network was "crucial" for the facility's productivity.

"Prelude will be equipped with ABB's integrated marine solutions for optimal reliability, flexibility and energy efficiency to assure higher profitability," Tiitinen said.

"In line with our ‘Next Level' strategy of business-led collaboration various ABB businesses will work together to mobilise the strength and experience of our entire global service organisation."

The electrical system will power 14 gas plant modules, allowing the facility to produce 5.3 million tonnes per annum of LNG.

ABB said the agility of FLNG allows oil and gas companies to develop fields that would otherwise be uneconomical and their environmental impact was "minimal" compared to conventional production platforms and pipelines.