The National Grid of the Philippines (NGCP), the country’s power-lines concessionaire, has filed an application with the Energy Regulatory Commission (ERC), seeking an approval to construct a new substation in Antipolo city.

The project is estimated to cost PHP3.1bn ($73.1m).

NGCP’s new substation will be built in Barangay San Juan in Antipolo city, as part of the company’s 2012 Transmission Development Plan (TDP) to expand and improve Philippine grid over the next 10 years, reported Business Mirror.

The company has undertaken the Antipolo extra-high voltage (EHV) substation project to transfer some of the load from the San Jose substation and lower the critical level and vulnerability of the San Jose substation.

NGCP spokesperson Cynthia P Alabanza was quoted by the publication as saying, "It will give us operational flexibility that will allow us to maintain or shutdown San Jose substation without affecting power delivery to and from Metro Manila."

The proposed Antipolo substation will be an EHV substation with an initial installed capacity of two 750 megavolt-ampere (MVA) transformers, which can be expanded to up to four 750MVA transformers.

The project work involves construction of a transmission line and substation.

The transmission line work involves building two 500kV transmission line extensions with a combined span of 17.5km connecting Antipolo substation with San Jose and Tabayas EHV transmission lines.

The substation component of the project comprises of two stages, first the construction of the 230kV switching facility beside Manila Electric’s 115kV substation in Antipolo, and the development of the EHV substation.