Electricity bills are expected to increase this month as system-wide spot prices rose by 22.7 percent to nearly ₱10 per kilowatt-hour (kWh) in June amid tighter supply driven by persistent power outages in Visayas.According to the Independent Electricity Market Operator of the Philippines (IEMOP), nationwide Wholesale Electricity Spot Market (WESM) prices went up to ₱9.56/kWh in June from ₱7.79/kWh in the previous month.This was despite overall …