500 kV Shin Sakato Substation, Japan
500 kV Shin Sakato Substation, Japan
Transmission Project, Sri Lanka
Transmission Project, Sri Lanka
Mobile Substation, Iraq
Mobile Substation, Iraq

Nippon Koei has 60 years experience in consulting services for development of power transmission networks in more than 40 countries.

We have worked on a total of 5000 km of transmission lines.

We can deliver a power transmission network that provides reliable and stable power supply that supports people's lives as well as the economic growth of a country. This consists of overhead transmission lines, underground & marine cable lines, grid substations, and distribution lines that connect electric power generating stations and load consumption. Our experience in all project stages allows us to evaluate alternative transmission line routes and substation sites considering actual geographical and environmental conditions, propose the most suitable one, and then efficiently revise the design.

We offer extensive engineering services for power transmission network development based on design knowledge and construction experience that covers all kinds of power transmission network. We have in-house the many kinds of specialists required for all project stages from initial investigations, planning, designing, tender processing to construction supervision. We also have the sophisticated tools and technologies at the planning and designing stages, such as PSS/E, DigSILENT, PS-CAD, E-TAP, and SIMDIST for network analysis, and PLS-TOWER, PLS-CADD for transmission line design.

Selected Project Experience showing Transmission Line Distance Range

Line DistanceCountryProject
1,106 km
IndiaSimhadri & Vizag Transmission System Project
330 km
Vietnam Ham Thuan - Da Mi Hydropower Project (with the Associated Transmission Line and Substations)
322 km
Bangladesh West Zone Power System Development Transmission Line Project
300 km
Lao PDRGreater Mekong Power Network Development Project
240 km
Afghanistan Emergency Infrastructure Rehabilitation and Reconstruction Project (Part B: Power Component) - Transmission Line Heiratan - Pul-e-Khumri
174 km
Sri Lanka Transmission & Grid Substations Development Project
102 km
Peru Electric Frontier Expansion Project (ll)
64 km
Indonesia Peusangan 1 & 2 Hydroelectric Power Development Project
50 km
Kenya Sondu/ Miriu Hydroelectric Power Project
48 km
Nepal Transmission Component of Rural Electrification, Distribution & Transmission Project
Mushviq Substation Baku, Azerbajan
Mushviq Substation Baku, Azerbajan
West Zone Power System Development, Bangladesh

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