World’s largest solar-plus-storage site with 3.5 GW capacity confirms safe grid connection
The world’s largest solar-plus-storage project has made a critical achievement that confirms system readiness and safe connection to the Luzon grid.
Meralco PowerGen Corporation (MGEN), through its affiliate Terra Solar Philippines Inc. (MTerra Solar), has successfully completed the initial grid synchronization and energization of the MTerra Solar project.
The milestone was marked through “The First Spark: MTerra Solar Phase 1 Initial Grid Synchronization and Energization,” an event held on 12 February in Gapan, Nueva Ecija.
Development builds on MTerra Solar’s continued progress for its Phase 1,
“Today is an important moment because it tells us we are on the right track not just in delivering scale, but in proving that we can operate this project safely and reliably,” said MGEN Renewables and MTerra Solar President & CEO Dennis B. Jordan.
“And after a milestone like this, the message is clear: anything is possible from hereon. We now move forward with confidence – continuing to expand capacity, push innovation, and deliver clean energy for Filipinos.”
It has been revealed that the development builds on MTerra Solar’s continued progress for its Phase 1, following the successful energization and cut-in of its 500-kilovolt (kV) substation along the Nagsaag–San Jose 500-kV Line 2, a critical infrastructure component supporting the project’s grid integration.
Phase 1 of MTerra Solar is progressing on schedule
Phase 1 of MTerra Solar is progressing on schedule, with 1,288 MWdc of installed solar photovoltaic (PV) capacity as of end-January 2026, making it the largest solar installation in the Philippines to date. In parallel, 622 battery energy storage system (BESS) units have already been installed, which is also set to be the largest in the Philippines once fully operational, according to a press release.
DOE Undersecretary Rowena Guevara also highlighted that the significance of the switch-on as a key step in preparing MTerra Solar for power export and full synchronization with the grid. She noted that the project reflects the kind of innovation and system readiness needed to support the country’s growing electricity demand, particularly during peak summer months.
“Today’s switch-on initiates the energization process that will enable MTerra Solar to begin exporting power to the grid,” said Guevara.
“Once synchronization is completed, the plant can begin supplying firm and dependable capacity through the combination of solar power and battery energy storage – another first for the country. Your commitment to adapting forward-looking solutions reflects the proactive leadership needed to meet the rising electricity demand, especially during summer months.”
Actis also reaffirmed the global significance of the project, noting how MTerra Solar is gaining attention from the international energy community.
“No matter where I go in the world, everyone wants to talk about the MTerra Solar project – whether it’s in Brazil, India, or Japan. The whole energy industry globally is watching this project. We are very grateful to be part of the team that is delivering this,” said Actis Managing Director, head of Operations, Energy Infrastructure, Barry Lynch said.