ETED Approval Secured: 138kV Double-Circuit Steel Pole Project Completed for Dominican Market
Empresa de Transmisión Eléctrica Dominicana (ETED) is one of the most influential transmission infrastructure operators in the Caribbean. Its transmission network spans over 4,700 kilometres, covering 345kV, 230kV, 138kV, and 69kV voltage levels, with more than 140 transmission substations. For global steel pole suppliers, securing ETED technical approval is equivalent to obtaining a “market access licence” for the Dominican Republic and the wider Caribbean region.
Recently, a 138kV steel tower and steel pipe pole project designed by a Chinese supplier completed delivery to the Dominican market. The steel poles and towers passed ETED approval in a single review and were delivered ahead of schedule while maintaining quality. This article reviews the technical requirements and approval logic behind ETED's 138kV steel pole specifications.
ETED is the state-owned power transmission company of the Dominican Republic, legally responsible for operating the country’s interconnected transmission system. Its core mandate is to ensure efficient and secure power delivery from generation plants to distribution companies, while maintaining and expanding the national transmission network.
Under ETED’s 2021–2035 Expansion Plan, the country has already added 19 transmission lines, with 27 transmission line and substation projects currently under execution—investments exceeding DOP 26 billion—which will deliver 1,490 MVA of transformer capacity and 582.97 km of new transmission lines upon completion. The 138kV transmission line is one of ETED’s core voltage classes for current expansion—including the 54-km Bonao III–Pimentel line (budgeted at approximately USD 18 million), the Hainamosa–Guerra line, and the Nagua–Río San Juan line, among others.
Behind this massive grid expansion, demand for steel transmission poles and towers continues to grow. However, the market entry barrier is clear: all products must pass ETED’s technical approval.
Based on ETED’s 138kV transmission line technical specifications and actual completed project cases, the following parameters represent the technical baseline that suppliers must meet:
Steel grade and strength. ETED’s 138kV line steel structure design specifications explicitly state that only St 37-2 and St 52-3 structural steels are typically used. St 37-2 is equivalent to Q235B (minimum yield strength 235 MPa), while St 52-3 is equivalent to Q345B (minimum yield strength 345 MPa). For 138kV double-circuit steel poles, Q345 (equivalent to ASTM A572 Grade 50) is a common choice. Its 345 MPa yield strength allows for optimised wall thickness design and reduced total steel consumption while meeting combined high wind and seismic load requirements.
Galvanizing and corrosion protection. The Dominican Republic has a tropical maritime climate with high airborne chloride concentrations—corrosion protection is central to the life-cycle management of steel poles. ETED projects mandate hot-dip galvanizing, with a minimum coating thickness of ≥85 µm, compliant with ASTM A123.
Design environmental loads. Located in the Atlantic hurricane belt and at a tectonic plate boundary, Dominican transmission steel poles must simultaneously satisfy 45 m/s basic wind speed and high seismic design parameters (Ss=0.8g, S1=0.3g, Site Class C). These are the core input parameters for structural calculations in the ETED approval process.
Pole type and circuit configuration. 138kV projects widely adopt octagonal tapered steel poles in double-circuit configurations. The octagonal cross-section provides a superior section modulus per unit weight, while the tapered design allows for nested shipping, reducing sea freight costs.
In the Dominican transmission infrastructure sector, “passing ETED approval in a single review” carries clear industry signalling value.
ETED’s approval process covers the full suite of technical documentation—design files, material certificates, and Mill Test Reports. Any parameter falling short—whether chemical composition deviations, insufficient galvanized coating thickness, or failed structural stress ratio verification—can result in approval rejection and project delays.
The 138kV steel tower and pole project passed ETED approval in a single review and was delivered ahead of schedule while maintaining quality. This signifies:
Design: Structural design has been fully aligned with ETED’s 138kV line technical specifications (including ASCE 7-22 load calculations, AISC 360-22 steel design, etc.);
Materials: Chemical composition and mechanical properties of Q345 steel have passed ETED-accredited third-party testing;
Fabrication: Welding procedures, galvanizing processes, and dimensional tolerances have met ETED’s factory inspection standards;
Delivery: Production scheduling and logistics have demonstrated 60-day batch delivery capability.
For suppliers planning to enter the Dominican market, this case provides a clear technical benchmark for reference.
ETED’s technical approval system is essentially a “technical filtering mechanism” . It requires suppliers not only to possess production capacity, but also design capability under international standards and end-to-end quality control.
With multiple 138kV projects ongoing—including the Jimaní 138kV substation construction, the Pizarrete–15 de Azua–San Juan Maguana line, and others—demand for steel poles in the Dominican market will continue to be released. For suppliers aiming to enter this market, three preparatory steps are recommended:
Benchmark ETED technical specifications: Obtain the latest ETED 138kV line technical specificationsand verify all parameters—material, galvanizing, load design—item by item;
Prepare complete Mill Test Certificates: ETED approval requires full Mill Test Reports covering chemical composition, tensile properties, coating thickness, weld NDT, and all other required data;
Allow sufficient time for the approval cycle: While “single-review approval” is the ideal outcome, technical documentation preparation and review still require adequate lead time.
The successful single-review ETED approval and delivery of the 138kV steel pole project validates the feasibility of the Q345 steel + ASTM A123 hot-dip galvanizing (≥85 µm) + octagonal tapered section technical approach in the Caribbean market. With 27 transmission projects currently under execution by ETED, the procurement window for this market remains wide open. For steel pole suppliers, understanding ETED’s technical approval logic and benchmarking against its 138kV line specifications is the prerequisite for securing project qualification.
ETED Approval Secured: 138kV Double-Circuit Steel Pole Project Completed for Dominican Market
Empresa de Transmisión Eléctrica Dominicana (ETED) is one of the most influential transmission infrastructure operators in the Caribbean. Its transmission network spans over 4,700 kilometres, covering 345kV, 230kV, 138kV, and 69kV voltage levels, with more than 140 transmission substations. For global steel pole suppliers, securing ETED technical approval is equivalent to obtaining a “market access licence” for the Dominican Republic and the wider Caribbean region.
Recently, a 138kV steel tower and steel pipe pole project designed by a Chinese supplier completed delivery to the Dominican market. The steel poles and towers passed ETED approval in a single review and were delivered ahead of schedule while maintaining quality. This article reviews the technical requirements and approval logic behind ETED's 138kV steel pole specifications.
ETED is the state-owned power transmission company of the Dominican Republic, legally responsible for operating the country’s interconnected transmission system. Its core mandate is to ensure efficient and secure power delivery from generation plants to distribution companies, while maintaining and expanding the national transmission network.
Under ETED’s 2021–2035 Expansion Plan, the country has already added 19 transmission lines, with 27 transmission line and substation projects currently under execution—investments exceeding DOP 26 billion—which will deliver 1,490 MVA of transformer capacity and 582.97 km of new transmission lines upon completion. The 138kV transmission line is one of ETED’s core voltage classes for current expansion—including the 54-km Bonao III–Pimentel line (budgeted at approximately USD 18 million), the Hainamosa–Guerra line, and the Nagua–Río San Juan line, among others.
Behind this massive grid expansion, demand for steel transmission poles and towers continues to grow. However, the market entry barrier is clear: all products must pass ETED’s technical approval.
Based on ETED’s 138kV transmission line technical specifications and actual completed project cases, the following parameters represent the technical baseline that suppliers must meet:
Steel grade and strength. ETED’s 138kV line steel structure design specifications explicitly state that only St 37-2 and St 52-3 structural steels are typically used. St 37-2 is equivalent to Q235B (minimum yield strength 235 MPa), while St 52-3 is equivalent to Q345B (minimum yield strength 345 MPa). For 138kV double-circuit steel poles, Q345 (equivalent to ASTM A572 Grade 50) is a common choice. Its 345 MPa yield strength allows for optimised wall thickness design and reduced total steel consumption while meeting combined high wind and seismic load requirements.
Galvanizing and corrosion protection. The Dominican Republic has a tropical maritime climate with high airborne chloride concentrations—corrosion protection is central to the life-cycle management of steel poles. ETED projects mandate hot-dip galvanizing, with a minimum coating thickness of ≥85 µm, compliant with ASTM A123.
Design environmental loads. Located in the Atlantic hurricane belt and at a tectonic plate boundary, Dominican transmission steel poles must simultaneously satisfy 45 m/s basic wind speed and high seismic design parameters (Ss=0.8g, S1=0.3g, Site Class C). These are the core input parameters for structural calculations in the ETED approval process.
Pole type and circuit configuration. 138kV projects widely adopt octagonal tapered steel poles in double-circuit configurations. The octagonal cross-section provides a superior section modulus per unit weight, while the tapered design allows for nested shipping, reducing sea freight costs.
In the Dominican transmission infrastructure sector, “passing ETED approval in a single review” carries clear industry signalling value.
ETED’s approval process covers the full suite of technical documentation—design files, material certificates, and Mill Test Reports. Any parameter falling short—whether chemical composition deviations, insufficient galvanized coating thickness, or failed structural stress ratio verification—can result in approval rejection and project delays.
The 138kV steel tower and pole project passed ETED approval in a single review and was delivered ahead of schedule while maintaining quality. This signifies:
Design: Structural design has been fully aligned with ETED’s 138kV line technical specifications (including ASCE 7-22 load calculations, AISC 360-22 steel design, etc.);
Materials: Chemical composition and mechanical properties of Q345 steel have passed ETED-accredited third-party testing;
Fabrication: Welding procedures, galvanizing processes, and dimensional tolerances have met ETED’s factory inspection standards;
Delivery: Production scheduling and logistics have demonstrated 60-day batch delivery capability.
For suppliers planning to enter the Dominican market, this case provides a clear technical benchmark for reference.
ETED’s technical approval system is essentially a “technical filtering mechanism” . It requires suppliers not only to possess production capacity, but also design capability under international standards and end-to-end quality control.
With multiple 138kV projects ongoing—including the Jimaní 138kV substation construction, the Pizarrete–15 de Azua–San Juan Maguana line, and others—demand for steel poles in the Dominican market will continue to be released. For suppliers aiming to enter this market, three preparatory steps are recommended:
Benchmark ETED technical specifications: Obtain the latest ETED 138kV line technical specificationsand verify all parameters—material, galvanizing, load design—item by item;
Prepare complete Mill Test Certificates: ETED approval requires full Mill Test Reports covering chemical composition, tensile properties, coating thickness, weld NDT, and all other required data;
Allow sufficient time for the approval cycle: While “single-review approval” is the ideal outcome, technical documentation preparation and review still require adequate lead time.
The successful single-review ETED approval and delivery of the 138kV steel pole project validates the feasibility of the Q345 steel + ASTM A123 hot-dip galvanizing (≥85 µm) + octagonal tapered section technical approach in the Caribbean market. With 27 transmission projects currently under execution by ETED, the procurement window for this market remains wide open. For steel pole suppliers, understanding ETED’s technical approval logic and benchmarking against its 138kV line specifications is the prerequisite for securing project qualification.
