There is a very little, if not none, documents that will verify what power plant is the very first in the Philippines. However, based on the author’s personal visit to some of the plants, and some research and conversation with some reliable individuals from the industry, he compiled some of the oldest power plants in the Philippines, all hydroelectric power plants, and most are still operational today.
23.50 MW Caliraya Hydroelectric Power Plant (Lumban, Laguna)
Caliraya hydro plant was built by NPC and commissioned on 1942-1950 and one of the CBK Plants (Caliraya - Botocan - Kalayaan Plant Complex). The complex is now owned by one of the IPPS’s of NPC, the consortium of Sumitomo Corporation and Electric Power Development Co., Ltd (J-Power) who take over the CBK Power Company Ltd. and Kalayaan Power Management Corporation, the former owners of CBK Plants who purchased it from NPC through an “anomalous” deal. Based from some former NPC engineers, Caliraya Hydro Electric Plant is the first power Plant in the Philippines. The current owner rehabilitated the three plants and re-commissioned it on 2002-2003.
23 MW Botocan Hydroelectric Power Plant (Majayjay, Laguna)
Botocan hydro plant was built by NPC and commissioned on 1946-1948 and one of the CBK Plants (Caliraya - Botocan - Kalayaan Plant Complex.
1×560 kVA Palakpakin Hydroelectric Power Plant (Laguna)
1×150 kVA + 2×200 kVA Balugbog Hydroelectric Power Plant (Laguna)
1×75kV Unit Kalibato Hydroelectric Power Plant (Laguna)
All mini-hydro in size, these 3 Plants are among the oldest in the Philippines (1933 - 1938). The owner is the Philippine Power Development Corporation (Philpodeco).
The Plants are sparsely located in Laguna Areas, closed to Botokan HEPP. These plants are still operational but already in bad condition. It’s connected to the TransCo grid through the Botocan substation
Villa Escudero Hydro Plant (San Pablo, Quezon Province)
Based on this blog, http://heritageconservation.wordpress.com/2006/07/27/escudero-hydroelectric-power-plant/, and on the engrave markings, it seems that this plant was built sometime in 1937. It was supposed to generated power for the Escudero coconut plantation in Tayabas, Quezon. It’s no longer in use but very well-preserved.
I haven’t seen this plant yet to confirm the claim and get its rated capacity. But if the blog’s claim is true, it was indeed one of the oldest.