The National Grid Corporation of the Philippines (NGCP) reported that transmission rates climbed in August 2025, driven mainly by higher ancillary service (AS) costs. Rates rose 7.09 percent to P1.4171 per kilowatt hour (kWh), up from July’s P1.3233/kWh.
According to NGCP, AS charges surged to P0.7446/kWh in August from P0.6659/kWh the previous month—a jump of P0.0787/kWh. AS refers to power supplied by accredited providers to maintain grid stability during supply-demand imbalances.
NGCP stressed that these AS charges are pass-through costs that go directly to generating companies with bilateral contracts or to the Independent Electricity Market Operator of the Philippines (IEMOP) for power sourced from the Reserve Market. The grid operator clarified it “does not earn from AS and does not benefit from changes in AS prices.”
Despite the increase in AS costs, the transmission wheeling rate—the fee for delivering power through the grid—remained largely stable. It inched up to P0.5970/kWh in August from P0.5923/kWh in July.
“For August 2025, NGCP charges only about P0.5970/kWh for its transmission service, while Ancillary Services remain the biggest component of transmission-related costs,” the company said.