WikiProject Power networks/Philippines

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This page aims to coordinate the efforts of mapping electricity-related objects in the Philippines.

Power Grid Status

Most power transmission lines are operated, maintained, and developed by the National Grid Corporation of the Philippines, while power generating sites are owned by various companies. The government-owned National Transmission Corporation (TransCo) actually owns these lines and facilities, in accordance with the Electric Power Industry Reform Act (EPIRA) law. It is currently divided into three grids: the Luzon Power Grid, the Visayas Power Grid, and the Mindanao Power Grid. They are further subdivided into dozens of transmission lines, which carry up to 500 kilo volts of energy.

Minor lines are feeders operated by distribution utilities, like Meralco (Manila Electric Company), and local electric cooperatives/companies, which may also operate subtransmission lines between substations within their power networks and the main power grid by NGCP. The minor lines feed power from the substations to residential and industrial users (although some industrial users also feed power from the subtransmission lines operated by utilities or local electric cooperatives/companies).

National Grid Corporation of the Philippines

operator=National Grid Corporation of the Philippines

The National Grid Corporation of the Philippines (NGCP), a private company given a 50-year concession to operate and expand the Philippine power grid, operates most transmission lines in the Philippines. NGCP-operated transmission lines, with voltages of 69 kV, 115 kV, 138 kV, 230 kV, 350 kV DC, and 500 kV, connects power plants with its substations, and feeds them to utility/cooperative owned substations via sub-transmission lines (69 kV and 115 kV), although the utilities/cooperatives may own their own subtransmission lines, mostly lines once operated by NGCP.

Mapping progress

Most major NGCP lines and substations have been mapped in Luzon, but there are still a number of gaps to be filled, such as line info (voltage, conductor count) and missing substations. Backbone power lines in Visayas are mostly mapped, but there remains a number of gaps, such as missing lines and cables, and substations, and cleanup of lines added by blocked user "bryanpiczon" and related accounts is ongoing. Progress in Mindanao is almost complete, but major lines are still incomplete, especially in Zamboanga Peninsula and Caraga.

National Transmission Corporation

owner=National Transmission Corporation

The National Transmission Corporation (TransCo) is a government-owned and controlled corporation that was created in 2001 through the Electric Power Industry Reform Act (RA 9136). It is the owner of the country's power grid that is being operated, maintained, and developed by NGCP. The company has also branches on some freeport or economic zones which serves as a power distributor on those areas, such as its Freeport Area of Bataan (FAB) branch in Mariveles, Bataan.




Meralco also operates a network of transmission lines, called sub-transmission lines, that uses either 115 kV or 69 kV. The sub-transmission lines feed power from large substations mainly operated by the National Grid Corporation of the Philippines to Meralco's distribution substations, which may serve a part of a city or municipality or even a whole city/municipality. Occasionally, sub-transmission lines may feed power from a power plant or link to a substation that serves a large industrial customer.

Mapping of Meralco 115 kV and 69 kV sub-transmission networks remains slow, though some lines (or portions of it) has been mapped. 34.5 kV, 13.8 kV and 4.8 kV lines is marginally covered, since they are not as very visible as many sub-transmission lines.


TODO: Add more guidelines on mapping power facilities and power lines

  1. Power generators/power plants are sometimes called "power stations". Do not tag them as power=station. Instead, tag them as power=plant. The generators inside would get the power=generator tag.
  2. Power stations are individually named (in most cases) and are called "substations" (e.g. "San Jose del Monte Substation"). Do not tag them as power=sub_station. Instead, tag them as power=substation.
  3. Sub-transmission lines (69 kV to 115 kV, except for two lines in Ilocos Region, which are transmission lines instead) mounted on tubular steel, concrete, or wood poles, usually shared with minor power lines and telephone/cable television lines, like those owned by the National Grid Corporation of the Philippines, Meralco and some electric cooperatives/companies on most provinces, are to tagged as power=tower(usually for H-frames and lattice structures) or power=pole(for most structures) and the specific tower or pole design, commonly flag, triangular, H-frame, or asymmetrical, depending on the arrangement of the cables and insulators on the pole, whether the insulators are mounted on a cross-arm or on the pole itself. Some utility poles have designs other than the usual cross-arm mounted insulator type, like flag, triangular, or asymmetrical (with insulators mounted on the pole or on an adaptor made from cross-arms typically found on most poles) but they should be tagged with power=pole. Insulators or cross-arms only carrying ground wires should not be considered when tagging design of a sub-transmission pole or utility pole.
  4. Power lines below 69 kV (i.e. all distribution lines, between 220 V and 13.8 kV or 34.5 kV) should be mapped as power=minor_line. If line has voltages higher than 69 kV (i.e. all transmission and subtransmission lines), they should be mapped as power=line. The frequency of the power grid in the Philippines is 60 Hz, except high-voltage direct current, like the HVDC Luzon Leyte, which should be tagged with frequency=0, used to mark HVDC or DC contact lines or third rail used for railways and rapid transit systems.
  5. Tagging a tower or line with owner=National Transmission Corporation is optional. If its danger plate sign says "TransCo Property" even though that structure/s is/are commissioned by NGCP (the purpose for this is because these transmission facilities are still government-owned) such as towers 255, 256, 266, and 267 of Hermosa-Balintawak Transmission Line, you may tag them.
  6. If a tower that is made of steel was painted with aluminum paint, you may tag it as colour=aluminum or colour=zinc.


Here is a list of some common voltages used in the Philippines. These include common voltages in power lines as well as secondary voltages of distribution transformers

Type voltage voltage level code description Line characteristics
Distribution 110/220 or 220 (nominally 120/240 or 240) Typical voltage on secondary distribution lines.
  • Triple-wire (two phase wires and one neutral/ground wire, with the lines at 110 V, as used by Meralco, VECO, Davao Light, CEPALCO, CELCOR, FBIC, and IEEC), but two wires (one line and one neutral, with the line at 220 V) are common in areas served by electric cooperatives.
  • Can be twisted insulated cable or bare wires.
  • Uses small insulators, either one or a set of two or three.
  • Mounted on poles, mostly under primary distribution lines, but may run on a separate set of poles, especially on residential areas.
110/190 (nominally 120/208) Three-phase secondary distribution voltage, usually used to feed large commercial users. Common in the provinces.
  • Uses three split-phase transformers arranged in a set.
110/190-220 (nominally 120/208-240) Three-phase voltage used for high-leg delta systems.
  • Voltages are 110/220 volts split-phase for ordinary appliances and lighting, 220 volts three-phase for larger appliances, and 208 volt high-leg voltage.
  • Uses two transformers, one with two secondary wires (one links to one phase wire from the second transformer), and another carrying three secondary wires (one is a center tap) and larger than the other.
127/220 (nominally 139/240) Common three-phase distribution voltage. Used by Meralco and CEPALCO.
254/440 (nominally 277/480) Three-phase secondary distribution voltage, usually used to feed large commercial users. Used by Meralco and CEPALCO.
  • Uses three transformers (with four bushings) arranged in a set.
2800/4800 Distribution voltage still used on some areas of Metro Manila, and fed by the 34.5 kV system. Most of these systems are already obsoleted (customers connected to 6.28 kV systems being reconnected to the 34.5 kV system, 6.28 kV lines below 34.5 kV lines discarded, or 6.28 kV-only lines replaced by 34.5 kV lines), but still exist on parts of Manila, Pasay, Quezon City, and Parañaque. Uses transformers with bushings on the sides instead on the top. Usually placed below 34.5 kV lines. Separate lines usually use shorter poles (mostly replaced by taller poles when converted to 34.5 kV)
7970/13800 (or 7620/13200) Standard three-phase distribution line voltage by many electric cooperatives and other utility companies (except VECO), but also by Meralco (in northern Bulacan, southern Cavite, part of central Laguna, and Batangas City - San Pascual area). May be found under a 69 kV subtransmission line as a feeder.
  • Uses one or two-shed pin insulators, but typically uses one-shed insulators
  • Transformers found on the line usually has two bushings. In cooperative-served areas, only one bushing is used, except where the transformers form a bank.
13200/23000 Standard three-phase distribution line voltage by Visayan Electric Company (VECO).
20000/34500 Standard distribution voltage used by Meralco, but also used by Cagayan Electric Power and Light Company (CEPALCO) in some lines in Cagayan de Oro.
  • Usually overhead power lines, but may be an underground or overhead cable.
  • Almost placed roadside, with some exceptions
Subtransmission 69000 5 Typical subtransmission line voltage by NGCP and many provincial electric cooperatives. Also used by Meralco on subtransmission line in Bulacan and Batangas City and the Meralco-owned Clark Electric Distribution Company (CEDC) serving Clark Freeport.
  • Usually mounted on single poles, usually with two cross-arms with insulators forming an asymmetric arrangement or an "armless" design, where the insulators are mounted on the pole instead on a cross-arm, but H-frame towers, with two or three poles and a cross-arm, and rarely, lattice towers (used on one 69 kV line in Isabela and another in Pampanga) and tubular steel poles (like towers 49 and 50 of Hermosa-Calaguiman line) are also used. NGCP usually uses both poles with cross-arms and poles with insulators mounted on them directly, but electric cooperatives/utilities and Meralco primarily uses armless poles (Meralco's subtransmission line linking its two substations in Batangas City with the JG Summit chemical plant in Simlong, however, uses both designs, with and without cross-arms, like some NGCP subtransmission line that parallel some of its segments).
  • Uses hanging insulators, mounted on the cross-arm placed on the pole, or pin insulators mounted on the pole itself.
  • Lines may link to large industrial users fed directly to the subtransmission grid.
Subtransmission/transmission 115000 6 Standard subtransmission voltage by Meralco, especially on Metro Manila, Laguna, Cavite, Rizal and most of Bulacan. Used also by NGCP on some subtransmission lines in Cavite and transmission lines in Ilocos Region. *Usually mounted on insulators on single poles, either wood,concrete, or steel and with or without cross-arms, but H-frame towers or lattice towers are also used.
  • May feed a large industrial customer connected to the subtransmission grid.
  • Cables are usually single-conductor, but double-bundle cable are also used.
Transmission 138000 7 Typical voltage of NGCP transmission lines in Visayas and Mindanao.
230000 8 Typical voltage of NGCP transmission lines in Luzon.
  • Usually supported by lattice towers, but can also be used on tubular steel poles, especially where the line runs roadside or on structures added because of safety concerns. Examples of 230 kV line that both use steel poles and lattice towers are Hermosa-Duhat-Balintawak, SMC Consolidated Power Plant-Limay, Bay-Biñan, Mexico-Hermosa, Biñan-Muntinlupa, Limay-Hermosa, Limay-GNPower, Hermosa-San Jose, and Sucat-Araneta-Balintawak transmission lines, among others. There are also some 230 kV lines that only use steel poles, like the Limay-PPDC and Kadampat-Labrador transmission lines.
  • Wood poles (including H-frames) were used on some lines built by NAPOCOR until they are replaced later by steel poles or lattice towers. Examples of this are San Manuel-Concepcion-Mexico, Biñan-Dasmariñas, Hermosa-Duhat-Balintawak (used to replace steel poles that were washed away by lahars from Mt. Pinatubo, such as tower 143), and Mexico-Hermosa (only used on tower 5A) transmission lines, among others.
  • Larger lattice towers with design similar to those used on 500 kV lines are also used, especially where the portion of a line intersects with other power lines. Examples of this are towers 25 and 29 of Mexico-Hermosa, tower 59 of Hermosa-San Jose, and two lattice towers of Limay-Lamao and GNPower-Lamao transmission lines, among others.
350000 Voltage used on HVDC Leyte-Luzon transmission line
  • Supported by lattice towers with a single cross arm from Leyte to Samar and Luzon. On San Bernardino Strait between Cabacungan (Allen, Samar) and Santa Magdalena (Sorsogon Province, Luzon), the line uses submarine cables.
500000 9 Typical voltage of NGCP bulk power transmission lines in Luzon.
  • Usually supported by larger lattice towers. Steel poles are rarely used (only use is in termination towers of Kadampat-Nagsaag 500 kV Line at Nagsaag Substation).


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: WikiProject Power networks/Philippines/Power lines mapped

Components of power lines

Main article: WikiProject Power networks/Philippines/Components of power lines

Number of towers that were painted with aluminum or zinc paint

Main article: WikiProject Power networks/Philippines/Number of towers that were painted with aluminum or zinc paint

Number of retired structures

Main article: WikiProject Power networks/Philippines/Number of retired structures

Line and structure references

Main article: WikiProject Power networks/Philippines/Line and structure references

Abbreviation of substations and power plants

Main article: WikiProject Power networks/Philippines/Abbreviation of substations and power plants

Mapped transmission and subtransmission lines constructed by each companies

Main article: WikiProject Power networks/Philippines/Mapped transmission and subtransmission lines constructed by each companies

Power stations/substations mapped

Main article: WikiProject Power networks/Philippines/Power stations/substations mapped

Tower configurations/designs

Steel poles

  • SPQ2-A - Has triangular placement of insulators. Tower design is triangle.
  • SPQ2-B - Has insulators facing only in one direction. Tower design is flag.
  • SPR2 - Has six dead-end insulators located at both sides of a pole, and suspension clamp for optical ground wire and overhead ground wires placed between them. The tower design is anchor if it changes the direction of a line and flag if it does not change.

Lattice towers

  • DQ2 - Has six insulators on the tower's crossarms. Type of tower is suspension and number of circuits is 2.
  • DR2 - Same as DQ2, but the tower uses dead-end insulators.
  • STY2 - Has three insulators on its crossarms and the other three crossarms are not present on other side. Type of tower is suspension and number of circuits is 1.
  • STV2 - Same as STY2, but the tower type is anchor.
  • DQ - Has three insulators on one side of a tower, while the other three crossarms on its other side do not have insulators on them. Tower design is incomplete tower.
  • DR - Same as DQ, but it uses dead-end insulators.

List of relocated or reused and retired structures

Main article: WikiProject Power networks/Philippines/List of relocated or reused and retired structures


  • Total amount of existing (abandoned or in use) mapped structures: 4,804
    • Lattice towers: 3,098
    • Steel poles: 1,738
    • Portal towers: 44
    • H-frame: 7
    • Monopole: 2
    • Cement poles: 7
    • Wood poles: 1
  • Mapped substations: 129
    • NGCP: 51
    • Meralco:
      • 230/115 kV: 6
      • 230/69 kV: 1
      • 115/34.5 kV: 31
      • 115/13.8 kV: 4
      • 115-34.5/13.8 kV:
      • 69/13.8 kV: 7
      • 69-34.5/13.8 kV: 1
      • 34.5/6.28 kV: 3 (remaining); 4 (retired or converted to switching station or VR facility)
    • ISECO: 1
    • LUECO: 1
    • CAGELCO-I: 1
    • ISELCO-I: 1
    • TARELCO-I: 1
    • PELCO II: 1
    • SFELAPCO: 1
    • BATELEC-I: 3
    • BATELEC-II: 5
    • IEEE: 1
    • VECO: 1
    • Davao Light: 2
    • Other distribution companies: 2
  • Amount of retired mapped structures: 285
    • Lattice towers: 161
    • Steel poles: 111
    • Portal towers: 5
    • H-frame: 2
    • ERS towers: 4
    • Chainette towers: 2
  • Amount of painted towers: 293
    • Steel poles: 119
    • Lattice towers: 172
    • Portal towers: 2
  • Amount of reused structures: 18
  • Mapped power lines: 38
    • NGCP: 30
    • Meralco: 1
    • BATELEC-I: 2
    • BATELEC-II: 5 (including lines or line sections divested from NGCP in 2011)
    • LIMA Enerzone (LIMA Utilities) : 1 (all from NGCP, originally constructed by NAPOCOR)
  • Power lines commissioned by NAPOCOR: 36
    • 69 kV: 4
    • 115 kV: 5
    • 230 kV: 26
    • 350 kV: 1
  • Power lines commissioned by TransCo: 5
  • Power lines commissioned by NGCP: 14
    • 115 kV: 2
    • 230 kV: 6
  • Power lines commissioned by Meralco: 12
    • 69 kV: 5
    • 115 kV: 7
  • Power lines commissioned by Batangas I Electric Cooperative: 3
  • Power lines commissioned by Batangas II Electric Cooperative: 8