20 MW/ 20MWh Bay Battery Energy Storage System

Abstract

The integration of a Battery Energy Storage System (BESS) into the Makiling-Banahaw (Makban) Geothermal Power Plant in Laguna, Philippines marks a pivotal advancement in optimizing renewable energy operations. As the largest baseload renewable plant in Luzon, Makban plays a critical role in ensuring energy reliability and grid stability. However, the inherent mismatch between continuous geothermal steam production and fluctuating grid demand has historically led to steam venting—resulting in wasted renewable energy, disruption of the geothermal reservoir, particularly in pressure-sensitive wells, and increased environmental risk. The implementation of a BESS, hybridized with Makban Geothermal Plant (MGP) A Unit 2 via a 13.8 kV medium voltage system, allows for the absorption and storage of excess energy during periods of low demand. This not only minimizes energy waste but also enhances operational flexibility, reduces emissions, and supports grid reliability through ancillary services. This integration sets a precedent for other renewable energy facilities grappling with similar operational constraints.