This page aims to coordinate the efforts of mapping electricity-related objects in the Philippines. It is intended to be a guide for mapping power lines from aerial imagery and on-the-ground observation.
The Philippine power grid is divided into a transmission, sub-transmission, and distribution sector, and the grid frequency is at 60 Hz, the same as with North America.
The transmission grid, operating at 69 kV, 115 kV, 138 kV, 230 kV, and 500 kV, is divided into three grids, the Luzon Grid, the Visayas Grid, and the Mindanao Grid. Luzon Grid uses voltages of 69 kV, 115 kV, 230 kV, and 500 kV, while the Visayas and Mindanao grids use 69 kV, 138 kV, and 230 kV. The Luzon and Visayas grids are interconnected through the 350 kV DC HVDC Leyte-Luzon transmission line, while the Mindanao Grid remains isolated until the completion of a HVDC link from Negros to Lanao del Norte. Off-grid islands with multiple power sources (local power plants and offshore power barges) have transmission systems operating at 69 kV.
The transmission system and related facilities are operated and maintained by the National Grid Corporation of the Philippines (NGCP), and owned by the National Transmission Corporation (TransCo), a government-owned company split from the National Power Corporation (Napocor/NPC) which used to operate, maintain, and own the country's power grid until 2003.
There are also sub-transmission grids, which operate with voltages of 69 kV and 115 kV. NGCP normally runs these grids in conjunction with the transmission system in most of the country, but in poorer areas, 69 kV lines still function as transmission lines, and in Ilocos Norte, 115 kV is used for transmission. Power distributors and electric cooperatives also have their own sub-transmission systems, and many sub-transmission lines once maintained by NGCP are being handed to those.
The distribution networks are operated by a handful of both private and public power distributors, and hundreds of electric cooperatives, collectively called power distribution companies (PDCs) by the Department of Energy (DOE).
Standard voltages for power lines, from highest to lowest, are as follows. Unless otherwise marked, voltages are for three-phase systems, measured between each live wire. Distribution lines have a fourth neutral wire connected to ground, and both line-to-neutral (for single-wire lines) and line-to-line (for two or three-wire lines) voltages are listed.
|Voltage||Standard voltage code||Network||Comments||Appearance||Images|
|500 kV||9||Transmission||Extra-high-voltage line voltage in Luzon. Existing lines already mapped fully. Some lines operating at 230 kV (e.g. Naga-Tayabas).||Very tall towers. Lines use quadruple-bundle conductors. Some exceptions are the very tall steel poles inside Nagsaag EHV substation in Pangasinan.|
|230 kV||8||Used on most transmission lines in Luzon. In Visayas and Mindanao, used for bulk transmission. some lines operate at 138 kV.||Small to large double-circuit towers, or single delta towers. Newer lines in urban areas, or lines that run roadside or along railroads may use steel poles. H-frame in limited use. Some major ones upgraded to use double or quadruple-bundle conductor. A few lines with low ground clearance have some conductors either supported by steel or concrete poles.|
|138 kV||7||Used on the Visayas and Mindanao grids.|
|115 kV||6||Transmission/sub-transmission||Medium to tall poles, and H-frame towers. Lines in Ilocos primarily use conventional towers. Meralco primary uses double-bundle conductor for upgrades and new lines. Few lines branching.|
|69 kV||5||Used for sub-transmission in the majority of the country.||Medium to tall poles, and H-frame towers. Lines may branch off to supply a large industrial customer or a distribution substation.|
|20/34.5 kV||4||Distribution||Mostly used for distribution by Meralco in most of its coverage area. Other distributors operating lines with this voltage are CEPALCO (in Cagayan de Oro), and LIMA Enerzone (at LIMA Technology Center in Lipa and Malvar, Batangas)||Medium-size poles, usually placed roadside. Multiple wires and circuits may not be obvious from imagery. Networks form large webs of lines with many branches that may carry one or two wires. Step-down transformers normally mounted on poles.|
|25 kV single-phase||none||International AC railway electrification voltage. No installations yet, but is being planned for the future Mindanao Railway network.|
|7.97/13.8 kV||3||Used by most electric cooperatives, Meralco (in southern Cavite, central Laguna, Batangas City and San Pascual, Batangas, and northern Bulacan), and other electricity distributors. Wind farms also use this to collect power from each windmill.||Medium-size poles, usually placed roadside. Multiple wires and circuits may not be obvious from imagery. Networks form large webs of lines with many branches ("laterals") that may carry one or two wires. Step-down transformers normally mounted on poles.|
|3.6/6.28 kV||2||Used by Meralco on older inner-city lines in Metro Manila. Most lines being replaced by 34.5 kV facilities.|
|127/220, 400, and 254/440 V||none||Voltage supplied to large commercial/industrial consumers, and high-rise buildings. Supplied through a three-phase transformer (usually a set of two or three single-phase ones), a large ground-mounted transformer, or an indoor substation.||Wires usually connect directly to a single building. Rarely used for wide-area distribution.|
|230 V single-phase||none||Standard supply voltage for homes and small businesses and industries. Supplied from a single transformer connected to 1 or 2 wires of a primary distribution line.||Smaller (9m) poles. Lines either use two wires (most common) or three (American-style split-phase, with 115/230 kV. Example would be those by Meralco).|
Some nonstandard voltages are 350 kV for the HVDC-Leyte Luzon transmission line and submarine cable, and 13.2/23 kV for the Visayas Electric Company (VECO) distribution network in Cebu.
Most transmission lines have two circuits (6 wires), though there are also those with only one circuit (3 wires). Sub-transmission lines are often single-circuit, while distribution lines may have more that 2 circuits carried by the same poles or structures. This do not include the ground cable used for lightning protection.
Part of a distribution circuit can be fed from another substation, where one substation has to be shut down, or a line segment is being repaired. Transmission and sub-transmission lines are usually looped in most places.
See WikiProject Power networks/Philippines/Operators for guidance when tagging operators of any power line in the Philippines by region.
Power lines mapped
Main article: Power networks/Philippines/Power lines mapped
Components of power lines
Main article: Power networks/Philippines/Components of power lines
Number of towers that were painted with aluminum or zinc paint
Number of retired structures
Main article: Power networks/Philippines/Number of retired structures
Power line references
Main article: Power networks/Philippines/Power line references
Power line structures references
Abbreviation of substations and power plants
Mapped transmission and subtransmission lines constructed by each companies
Power stations/substations mapped
List of relocated or reused and retired structures
- Amount of painted structures: 581 (steel poles), 259 (lattice towers), 2 (portal towers). Total: 842
- Amount of reused structures: 18
- Mapped power lines: 30 (NGCP), 1 (Meralco), 2 (BATELEC-I), 5 (BATELEC-II, including lines or line section divested from NGCP in 2011), 1 (LIMA Enerzone (LIMA Utilities), all from NGCP, originally commissioned by NAPOCOR). Total: 39