NPC-SPUG operates 298 generating units with total rated capacity of 135.786 MW. This nationwide operation is composed of 81 land-based diesel power plants, 1 hydroelectric plant, 1 hybrid wind turbine farm and 11 barge-mounted mobile power plants. It serves 67 island grids and 8 isolated grids, 192 municipalities and 3,330 barangays. It has 42 customers consisting of 39 electric cooperatives and 3 local government units.

Presently, 28% or 20 of the island grids provide 24-hour electric service, while the remaining 72% or 52 of the grids are operating less than 24 hours

In 2005 NPC-SPUG generated a total of 494,845.461 MWH, with an aggregate energy sales of 503,222.621 MWH (including power purchased from IPPs). The average fuel consumption rates for Luzon, Visayas and Mindanao were 0.285 li/kWh (including rented gensets), 0.318 li/kWh and 0.309 li/kWh, respectively in 2005. NPC-SPUG absorbed an approximate of Php 2.6 billion in financial losses, net of proceeds from the UC-ME, in 2005.