System-wide average prices at the Wholesale Electricity Spot Market (WESM) declined by P0.51 per kilowatt-hour, or 11.2 percent, in May 2025 on higher supply margins despite increased demand.
Independent Electricity Market Operator of the Philippines (IEMOP) corporate planning and communications manager Arjon Valencia said prices eased to P4.01 per kWh in May from P4.52 per kWh in April.
Valencia said the system-wide average supply increased to 22,218 megawatts (MW) in May, marking a 4.1-percent rise from April 2025.
The figures from IEMOP, the operator of the WESM, cover the billing period April 26, 2025 to May 25, 2025.
“Demand also rose to 15,169 MW, a 2.9-percent increase compared to the previous month, driven by the continuous extreme heat experienced during the billing period. This supply-demand level resulted in an increased margin of 4,945 MW, up from 4,585 MW in April 2025,” Valencia said.
“Consequently, market prices dropped to P4.01 per kWh, down from P4.52 per kWh in the prior month. The price trend from April to May 2025 showed a decline, in contrast to the same period in 2024, where prices increased. This difference was due to a higher supply margin in May 2025,” he said.
Valencia said similar conditions were observed in Luzon and Visayas grids, with both supply and demand increasing.
Luzon demand increased 4.1 percent during the period to 15,620 MW, while Visayas demand also increased 4 percent to 2,664 MW.
Supply also increased in both areas by 3.6 percent in Luzon to 15,620 MW and 3.5 percent in Visayas to 2,664 MW. This brought the Luzon rates to P4.23 per kWh and Visayas to P3.71 per kWh.
