Proven expertise in high-voltage electrical infrastructure across the Philippines
From 500kV transmission tower erection to substation commissioning and distribution system upgrades, Hyojeong Power3 Construction Corp. has delivered safe, reliable, and high-quality power infrastructure for government agencies, utilities, and private clients since 2023.
Our Partners
We work with trusted local and international partners to deliver every project.
Featured Projects
SF6 Gas Testing & 230kV GIS Circuit Breaker Works — SMC Power Plant
Description:
Hyojeong Power3 Construction Corp. carried out SF6 gas handling, analysis, and grounding system integrity testing in Limay, Bataan. This was followed by SF6 gas leakage testing of 230kV GIS circuit breakers and the bus system at the SMC Power Plant in Mariveles, Bataan.
Scope of Work:
SF6 gas handling and analysis, grounding system integrity test, leakage testing of 230kV GIS circuit breakers, and bus system inspection — requiring strict safety protocols and specialized testing equipment to ensure the integrity of high-voltage gas-insulated switchgear.
230kV GIS Circuit Breaker Replacement — NGCP Substations
Description:
Replacement of 230kV circuit breakers (GIS type) at two NGCP substations — San Rafael, Bulacan and Olongapo, Zambales. The project also included secondary electrical works covering controls, protections, metering, alarms, and interlocking circuits at both substation sites.
Scope of Work:
Full replacement of GIS-type circuit breakers, followed by comprehensive secondary works including wiring of control and protection panels, metering systems, alarm circuits, and interlocking logic — all completed in compliance with NGCP standards and energized-system safety requirements.
LUECO 69kV Transmission Line Reconductoring & Phase 3 Extension
Description:
This multi-phase project for LUECO (Luz de Pampanga Electric Cooperative) involved reconductoring and revamping approximately 5.0 km of the existing 69kV transmission line — upgrading conductors from 2/0 AWG Cu to 336.4MCM TACSR across 50 structures. Phase 3 followed with installation and conductor stringing for an additional 7.4 km covering 113 structures.
Scope of Work:
Full reconductoring works, tower structure assessment and upgrades, conductor stringing and tensioning, infrared scanning of junctions and dead ends upon energization, and a separate 2.5km 13.2kV transmission line conductor stringing project under the same client.
500kV Transmission Tower Erection & Foundation Works — NGCP/MDC
Description:
One of our most significant projects to date: erection of Tower CD-43 for the NGCP/MDC 500kV transmission line in Barangay Pangil, Amadeo, Cavite, completed on 12 September 2025. This was accompanied by concrete foundation construction for Tower 82 in Cabangan, Zambales, and full sagging and clipping works in Gapan, Nueva Ecija.
Scope of Work:
Heavy civil works including tower foundation excavation and concrete pouring, structural steel tower assembly and erection, full sagging and clipping of 500kV conductors — all executed under strict NGCP/MDC safety and quality standards in challenging field conditions across multiple provinces.
Projects by Year
2023
- SF6 Gas Handling & Analysis — Limay, Bataan
- SF6 Gas Leakage Testing of 230kV GIS Circuit Breakers — SMC Power Plant, Mariveles, Bataan
- Electrical Testing of 75MVA Transformer
- Replacement of 230kV GIS Circuit Breakers — NGCP San Rafael, Bulacan
- Replacement of 230kV GIS Circuit Breakers — NGCP Olongapo, Zambales
- Secondary Works (Controls, Protections, Metering, Alarms) — NGCP Olongapo & San Rafael Substations
- Installation, Testing & Commissioning of Residential PV/Solar Power Systems
2024
- LUECO 69kV Transmission Line Reconductoring — 5.0 km, 50 structures (2/0 AWG Cu to 336.4MCM TACSR)
- LUECO 69kV Transmission Line Phase 3 — 7.4 km, 113 structures conductor stringing
- LUECO 13.2kV Transmission Line — 2.5km Conductor Stringing
- Underground Cable Installation — Auxiliary Power Supply, NGCP Mexico Substation
- Infrared Scanning — Junctions, Dead Ends & Loopings upon Energization
- Electrical Testing of 69kV PCB Dead Tank & Bushing CT/VT — Raslag4 Switching Station (Solar), Magalang, Pampanga
- Installation, Testing & Commissioning of Residential PV/Solar Power Systems
2025 — Ongoing
- NGCP/MDC: Erection of 500kV Transmission Tower CD-43 — Barangay Pangil, Amadeo, Cavite (Completed 12 Sep 2025)
- NGCP/MDC: Concrete Foundation Construction — Tower 82, Cabangan, Zambales
- NGCP/MDC: Full Sagging & Clipping of 500kV Transmission Lines — Gapan, Nueva Ecija
- CREC (Citicore Renewable Energy Corp.): Ductbank Construction for 69kV Underground Cabling
- LUECO: Conductor Stringing — 2.5km 13.2kV Transmission Line (ongoing)
Our Reach
- Pampanga — Multiple substation and distribution projects
- Bataan — High-voltage GIS and switchgear works
- Bulacan — NGCP substation circuit breaker replacement
- Zambales — NGCP substation works and 500kV tower foundations
- Cavite — 500kV transmission tower erection
- Nueva Ecija — 500kV full sagging and clipping
- Nationwide — Residential and commercial PV solar systems
Completed Works Showcase
Trust Hyojeong Power3 Construction Corp. to Deliver Reliable Electrical Infrastructure for Your Projects
From 500kV transmission tower erection and substation construction to distribution line upgrades and renewable energy systems we deliver expert electrical works that ensure safety, efficiency, and long-term performance across the Philippines.