The Independent Electricity Market Operator of the Philippines (IEMOP) expects the Wholesale Electricity Spot Market (WESM) to remain stable in the coming months, driven by ample supply and stable market conditions.

At a media briefing on Tuesday, IEMOP head of Trading Operations Isidro Cacho Jr. said the market has experienced consistent price trends since September of last year, remaining mostly between P4 and P5 per kilowatt-hour. 

Even with the expected maintenance of power plants, Cacho noted that prices could still stay steady through May and for the next six months.

“Given the trend we are seeing now, we have ample supply, and we expect the same level of margin throughout May. So, we anticipate the same level of prices we’re experiencing now. Hopefully, even lower. So, that’s around P4 to P5,” Cacho said. 

Scheduled maintenance has been factored into the supply outlook, with IEMOP ensuring that the electricity supply remains sufficient even during these periods. 

Cacho also pointed to the continuing development of renewable energy projects, which will further bolster the power grid’s supply. Additionally, improvements in the transmission system, such as the completion of key transmission lines last year, have helped prevent congestion and limitations in the grid.

"After the election season, we still see a more stable market, more ample supply, and generally stable prices," he added. 

The average electricity price at the WESM dropped by 15.3 percent to P4.52 per kilowatt-hour in April 2025, down from P5.34 per kWh in March, due to fewer power plant outages.

IEMOP, which operates WESM where electricity is traded, reported that the average available power supply increased by 8.8 percent, rising from 19,611 MW in March to 21,345 MW in April.

WESM is a marketplace where electricity is traded in real-time, matching sellers like power plants with buyers like utilities. Prices fluctuate based on supply and demand, ensuring efficient and fair electricity distribution.