The first phase of the MTerra Solar project in the Philippines has reached a major milestone with the successful grid synchronization and initial energization of the facility on the Luzon grid. The project, being developed on the island of Luzon, is planned as a 3.5 GW solar plant combined with a 4.5 GWh battery energy storage system, making it the world’s largest integrated solar-plus-storage facility once completed.

According to Meralco PowerGen Corporation, the initial switch-on confirms system readiness and safe grid connection. The National Grid Corporation of the Philippines described the milestone as critical for establishing transmission infrastructure for one of the country’s most significant clean energy projects. The Philippines’ Department of Energy added that the project will soon begin exporting firm and reliable power through its combined solar and storage setup.

By the end of this month, MTerra aims to have 250 MWac of solar and 112.5 MWh of BESS operational, exporting around 85 MW of constant power. As of January, 1,288 MW of solar capacity and 622 BESS units had already been installed, making it the largest photovoltaic array in the country.

Full completion of phase one is expected later this year, with phase two construction already underway. The development aligns with the Philippines’ broader renewable energy ambitions, including plans to auction 25 GW of new renewable capacity by 2035.