Carnival Corporation has announced a new multi-ship order for its first-ever liquefied natural gas-powered cruise ships.

The company is scheduled to take delivery of two 180,000-gross-registered-ton cruise ships in 2020 and 2022 which will be the largest in the company’s fleet.

Both ships will be powered by the company’s “green cruising” design, and will mark the first time an LNG-powered cruise ship is based in North America.

The ships, which will have an approximate capacity of 5,200, are being built by Finnish shipbuilder Meyer Turku.

“This new ship order signifies an extraordinarily exciting future for Carnival Cruise Line and the opportunities that lie ahead to introduce a variety of magnificent new features and innovations to further enhance our outstanding guest experience,” said Christine Duffy, president of Carnival Cruise Line. “We are also thrilled to be introducing Carnival Corporation’s ‘green cruising’ design platform to North America. Both of these ships will be fully powered at sea and in port by Liquefied Natural Gas, which is the world’s cleanest burning fossil fuel. These ships are being designed for maximum energy efficiency and environmental friendliness.”