The fishing grounds where Jung Kuenbae and his forbears have caught shrimp, butterfish and croakers for three generations are going to be turned into the world’s largest offshore wind farm. He’s OK with that.

“I initially opposed the idea when the plan was proposed because it will destroy our livelihood,” said Jung, who leads a group of local fishermen in some 200 ships that drop nets in the waters off the southwestern tip of the Korean peninsula. “But I realized the project is part of the country’s transition to cleaner energy, which is something we have to come to terms with, rather than fighting against it.”

It’s a momentous challenge. South Korea’s industrial ascent since the 1960s has made it one of the world’s top 10 energy users, with electricity consumption per capita ahead of both Japan and Germany. And two thirds of that comes from fossil fuels. Renewable energy accounted for only 6.5% of South Korea’s generation in 2019, with nuclear making up the balance.

“South Korea will have to source almost all of its electricity from renewable energy if it’s ever going to reach climate neutrality by 2050,” said Lee Sanghoon, president of the New and Renewable Energy Center at Korea Energy Agency. It “is a daunting task.”

Many countries are scaling up wind energy. Developers set a record last year as they installed 96.3 gigawatts of wind turbines globally, according to clean energy research group BloombergNEF. That would be enough to power about 36 million American households. The International Energy Agency estimates that at least 160 gigawatts of wind has to be added per year by 2025 in order to meet the Paris Agreement’s goals.

After retaining power last year on the promise of a “Green New Deal,” President Moon Jae-in’s Democratic Party has brought a new urgency to the transition, with a proposal to get more than 20% of its energy from renewables by 2030. For South Korea, it’s not just about curbing emissions. Apart from a tiny amount of gas and coal, all its fossil fuels are imported, costing the nation $73 billion a year.

The open seas have more consistent wind speeds and provide space to install the biggest, most efficient turbines. Just by using sites in shallow water that are near to shore, the world could get enough electricity to meet all global demand. With floating turbines that go further out to sea, wind power could satisfy more than 10 times the world’s total electricity demand by 2040, an IEA analysis showed.

Korea’s changing energy mix

Percentage of total power generation

Source: South Korean Energy Ministry

So far countries in northern Europe such as the U.K., Denmark and Germany have dominated the offshore wind industry, thanks to generous government subsidies and unusually shallow waters of the North Sea. But that’s starting to change. Last year China installed a record-number of offshore wind turbines to become the world leader in total capacity. U.S. President Joe Biden’s administration plans to rapidly scale up wind farms off the east coast.