MERALCO PowerGen Corp. (MGEN), together with its partners, inaugurated the MTerra Solar Phase 1 — marking the completion of the first phase of what is set to become the world’s largest integrated solar photovoltaic (PV) and battery energy storage system (BESS) — on July 14, 2026.
The milestone underscores the Philippines’ growing leadership in large-scale renewable energy development while reinforcing the country’s path toward a more secure, affordable and sustainable energy future.
During the inauguration, President Ferdinand Marcos Jr. emphasized the country’s ability to execute renewable energy projects of significant scale.
“The MTerra Solar project is proof that the Philippines is capable not only of envisioning, but also of delivering,” he said.
MGEN Chairman Manuel V. Pangilinan shared his vision for a future where clean, reliable energy is within reach of every Filipino.
“What we inaugurate today will be the world’s largest integrated solar and battery storage facility located in a single site. And it rises not in Texas, not in the Gobi Desert, but right here in Gapan, Nueva Ecija. This inauguration today was made possible not only by Meralco but by many other hands, other minds, and many hearts,” Pangilinan exclaimed.
MTerra Solar Phase 1 has successfully energized 1,373 MW of solar PV capacity and 825 MW of battery energy storage, equivalent to 3,300 MWh, making it the largest operational integrated solar and battery facility on a single site globally.
“MTerra Solar demonstrates what is possible when vision, innovation, and collaboration come together. Beyond building one of the world’s most significant renewable energy facilities, we are helping build a stronger and more resilient Philippine energy system capable of supporting the country’s long-term economic growth,” MGEN President and CEO Emmanuel Rubio said.

source