The MTerra Solar project in the Philippines has reached a major milestone with the successful initial grid synchronization and energization of its first phase. Located in Nueva Ecija, this facility is set to become the world’s largest integrated solar-plus-storage site. By combining massive solar module capacity with advanced battery energy storage system (BESS) technology, the project aims to provide a stable and clean power supply to the Luzon grid. This achievement marks a significant step toward the Philippines’ goal of reaching a 50% renewable energy share by 2040.
Terra Solar Philippines Inc., a subsidiary of Meralco PowerGen Corporation (MGEN), officially marked the project’s connection to the grid during an event titled “The First Spark” in Gapan, Nueva Ecija. This synchronization confirms that the massive infrastructure is ready to safely export power to the national transmission system. MGEN Renewables and MTerra Solar President and CEO Dennis B. Jordan stated that the milestone proves the project can operate reliably at an unprecedented scale, paving the way for further innovation in the country’s energy sector.
The successful energization follows the completion of a critical 500-kilovolt (kV) substation along the Nagsaag–San Jose 500-kV Line 2. This infrastructure is essential for integrating the high-capacity solar output into the existing power grid. As of early 2026, Phase 1 has reached 1,288 MWdc of installed solar PV capacity, making it the largest solar installation in the Philippines. To manage the intermittent nature of solar energy, the site already features 622 installed BESS units, which will provide the largest battery storage capacity in the region once fully operational.
Department of Energy Undersecretary Rowena Guevara highlighted the project’s importance in meeting the country’s growing electricity needs, particularly during the high-demand summer months. By combining solar power with large-scale battery storage, the plant can offer firm and dependable energy, a first for a project of this magnitude in the Philippines. This proactive approach is seen as a vital solution to the recurring energy challenges faced by the Luzon grid.
The project has also garnered significant international attention. Barry Lynch, Managing Director at Actis, noted that the global energy industry is closely watching MTerra Solar as a benchmark for large-scale renewable integration. As Phase 1 nears completion, construction on Phase 2 has already begun, marked by the installation of the first foundation piles. Upon full completion, the facility will stand as the world’s largest integrated solar and battery storage site, reinforcing the nation’s commitment to its 2030 and 2040 renewable energy targets.