Power consumers will see slightly higher transmission charges in their July 2025 electricity bills, with the increase largely driven by a spike in Ancillary Services (AS) costs, according to the National Grid Corporation of the Philippines (NGCP).

For the June 2025 billing period, the overall equivalent average transmission rate climbed to PhP1.2113/kWh, a 5.49% rise from May’s PhP1.1482/kWh. The bulk of this increase comes from a 9.32% hike in AS rates, which rose from PhP0.5655/kWh in May to PhP0.6182/kWh in June.

Ancillary Services refer to the additional power support required to maintain grid stability, especially during sudden supply-demand imbalances. These services are provided by power producers and are vital in ensuring reliable electricity delivery. NGCP does not earn from or profit off AS rates, as these are pass-through charges remitted to the respective power providers and the Independent Electricity Market Operator of the Philippines (IEMOP).

For Visayas, the June 2025 AS cost includes the final installment of deferred charges from March 2024, after the Energy Regulatory Commission (ERC) allowed phased recoveries.

Meanwhile, NGCP’s transmission wheeling rate—the cost for transporting electricity through its network—inched up by 0.39%, from PhP0.4593/kWh in May to PhP0.4611/kWh in June.

“For the July 2025 bill, NGCP charges only PhP0.46/kWh for its transmission services,” NGCP clarified. Despite the hike, AS remains the larger component of the total transmission-related charges on consumers’ electric bills.

NGCP assured the public that it continues to support a reliable and stable grid, while maintaining transparency in the pass-through components of their bills.