Jeju Island has made headlines by becoming the first region in South Korea to achieve a temporary RE100, covering 100% of its total electricity usage with renewable energy. This remarkable accomplishment took place on April 14, 2025, when the island managed to produce and supply electricity solely from renewable sources such as wind and solar power for a four-hour period, from 11 AM to 3 PM.

According to the Jeju Special Self-Governing Province, this achievement is particularly significant as it demonstrates the potential for full reliance on renewable energy, even if only for a limited time. The announcement was made public on April 16, 2025, highlighting the successful utilization of renewable energy during a period of favorable weather conditions.

During the four-hour window, Jeju’s renewable energy production exceeded local consumption, allowing for the excess electricity to be transmitted to the mainland through the No. 1 and No. 3 submarine cables. This bidirectional transmission capability, enabled by the high-voltage direct current (HVDC) submarine cable, can handle up to 180 megawatts per hour, effectively addressing any oversupply issues.

The success of this initiative was largely attributed to optimal weather conditions, which included strong winds and sufficient sunlight. On that day, the wind power utilization rate peaked at 51.8% at 1 PM, while solar power generation reached an impressive 73.1% during the same hour. These high utilization rates underscore the potential of renewable energy sources in meeting the island’s electricity needs.

However, Jeju Island has faced criticism for its plans to construct two liquefied natural gas (LNG) power plants, which many argue contradict the island’s carbon neutrality goals. Critics have pointed out that while the recent achievement demonstrates the viability of renewable energy, the ongoing investment in fossil fuel infrastructure raises concerns about the long-term commitment to sustainability.

In light of the recent success, Jeju officials are now discussing plans with the Korea Power Exchange to expand the ratio of renewable energy in the island’s energy mix. This includes the completion of a large-capacity energy storage system (BESS) with a capacity of 68 megawatts, which is expected to be finalized by the end of the year. This system will further enhance the island’s ability to utilize renewable energy effectively.

Yang Je-yoon, the head of the Jeju Innovation Industry Bureau, emphasized the importance of this milestone, stating, “This achievement symbolizes Jeju’s potential to serve as a proving ground for realizing RE100. We will continue to expand our facilities and operate our systems efficiently to establish a decentralized energy system centered around renewable energy.”

As the world continues to grapple with climate change, Jeju Island’s achievement serves as a beacon of hope, showcasing the possibilities of renewable energy and the importance of transitioning away from fossil fuels. The island’s commitment to sustainability is not only a local concern but also part of a global movement towards a greener future.

This temporary RE100 accomplishment is a significant step forward in demonstrating that with the right conditions and infrastructure, regions can meet their energy needs sustainably. As discussions regarding the future of energy on Jeju Island continue, the spotlight will remain on how the island balances its renewable energy ambitions with its plans for LNG power generation.

Jeju’s experience could provide valuable insights for other regions aiming to enhance their renewable energy capabilities. The successful integration of renewable sources into the energy grid, coupled with effective energy storage solutions, could pave the way for a more sustainable energy future.

As Jeju Island moves forward, the focus will be on ensuring that its energy policies align with its environmental goals, making it a model for other regions to follow. The island’s journey toward a fully renewable energy system may be just beginning, but its recent achievements indicate that a sustainable future is within reach.