National Grid Corp of the Philippines (NGCP) said Monday consumers can expect higher transmission rates in July, driven by increased ancillary services (AS) rates.
The transmission operator said in a statement that both AS and NGCP’s transmission wheeling rates rose in the June billing period, but the surge in AS costs accounted for most of the adjustment.
“For the July 2025 electric bill of the end consumers, NGCP charges only 0.46 pesos per kWh for the delivery of its services,” NGCP said, adding that AS still accounted for the bulk of transmission charges.
AS rates refer to the pass-through costs for power supplied by AS providers to stabilize the grid during power supply-demand imbalance.
AS 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.
Overall equivalent average transmission rates for the June 2025 billing period increased 5.49 percent to P1.2113 per kilowatt-hour from P1.1482 per kWh in May.
NGCP said the increase was led by a 9.32-percent rise in ancillary service rates in the June 2025 billing period.
It said AS rates increased to P0.6182 per kWh in June from P0.5655 per kWh in May.
NGCP said it does not earn from AS and does not benefit from the movement in prices.
Meanwhile, NGCP’s transmission wheeling rates slightly increased by 0.39 percent, from P0.4593 per kWh in the May 2025 billing period to P0.4611 per kWh in the June 2025 billing period.
Transmission wheeling rates are what NGCP charges for its primary service of delivering power.
