Ancillary Services drive increase in August 2025 transmission rates

Higher Ancillary Services (AS) costs pushed up transmission rates in August 2025, NGCP announced.

The overall equivalent average transmission rate for the August 2025 billing period rose by 7.09% to ₱1.4171/kWh, up from July’s ₱1.3233/kWh.

AS charges climbed by ₱0.0787/kWh, from ₱0.5872/kWh in July to ₱0.6659/kWh in August.

AS rates are pass-through costs for power supplied by AS providers during supply-demand imbalance. Charges are remitted directly to generating companies with bilateral contracts with NGCP, and to the Independent Electricity Market Operator of the Philippines (IEMOP) for AS sourced from the Reserve Market.

NGCP does not earn from AS and does not benefit from changes in AS prices.

Meanwhile, NGCP’s transmission wheeling rate—or the fee for delivering power through its grid—barely changed, inching up by ₱0.0047/kWh, from ₱0.5923/kWh in July to ₱0.5970/kWh in August.

“For August 2025, NGCP charges only about ₱0.5970/kWh for its transmission service, while Ancillary Services remain the biggest component of transmission-related costs,” the grid operator said.

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