Grid Expansion Meets Renewable Integration: How Steel Poles Support Costa Rica’s 230kV/138kV Transmission Upgrade

Costa Rica is at a critical intersection of energy transition and grid modernization. As a global leader in renewable energy, the country consistently generates over 98% of its electricity from clean sources—hydro, geothermal, wind, biomass, and solar. However, integrating such a high proportion of variable renewable energy is placing unprecedented demands on grid infrastructure.

To efficiently transmit power from newly built large-scale solar and wind projects in remote areas to load centers, the Costa Rican Electricity Institute (ICE) has launched a grid upgrade plan with a total investment of USD 100 million. At the heart of this plan lies a new, more stringent set of technical requirements for transmission steel poles.

I. Market Driver: Surging Solar and Wind Capacity Forces Grid Upgrades

Costa Rica’s grid upgrade is directly driven by profound changes in its energy mix.

ICE plans to add over 500 megawatts of generation capacity between 2025 and 2028, representing growth of nearly 14%. This new capacity comes primarily from solar and wind—variable renewable sources that require robust transmission infrastructure to integrate smoothly.

In Guanacaste province alone, ICE has signed contracts for 5 solar projects and 1 wind project totaling 106 MW. These new renewable plants are predominantly located in Guanacaste and Puntarenas regions—areas often far from major load centers such as the capital, San José. Existing transmission corridors are nearing capacity, necessitating the construction and expansion of high-voltage lines to deliver clean power efficiently. This is the direct driver behind ICE’s approval of the North-Central Transmission Infrastructure Upgrade Project.

II. Core Project: Upgrading the North-Central Transmission Arteries

As the flagship project of the grid upgrade, the North-Central project approved by ICE’s Board of Directors provides the most direct basis for steel pole selection:

The project aims to strengthen the national high-voltage grid, with its core function being to integrate power from new renewable plants in Guanacaste and Puntarenas and optimize Costa Rica’s international exchange capacity within the Central American Regional Electricity Market (MER).

III. Technical Challenges: Steel Pole Selection Under Dual Voltage Levels

ICE President Marco Acuña explicitly stated that such projects are key to “guaranteeing the electricity supply the country needs in the medium and long term, responding to energy demand and strengthening the stability of the National Electricity System.” To achieve this, steel pole selection must address the following core technical issues:

1. Dual Voltage Level Compatibility

Costa Rica’s national high-voltage grid operates on 230kV and 138kV dual voltage levels. The new 65-km line likely involves both. This means steel poles must provide sufficient electrical clearance and insulation coordination to meet operational requirements under different voltage classes. Pole height, cross-arm length, and structural configuration must be precisely calculated to satisfy minimum air gap requirements for conductors under both voltage levels.

2. Structural Strength and Load Design

Located in the Pacific volcanic and seismic belt, Costa Rica requires transmission steel poles to simultaneously comply with the Costa Rica Building Code (Reglamento de Construcciones) and the Costa Rica Seismic Code (Código Sísmico de Costa Rica) . Design loads must cover combinations of dead loads, live loads, seismic loads, and wind loads. Wind load estimation adopts a 50-year return period. This environmental context imposes structural safety margins and material toughness requirements that exceed conventional market standards.

3. Bulk Supply Capability and ICE Standard Compliance

ICE has procured steel poles through tenders, such as the purchase of poles for the La Caja–Coco–Garita transmission line. Suppliers entering this market must meet ICE’s stringent technical and delivery standards. Chinese suppliers have successfully delivered telecom poles for ICE projects, demonstrating the feasibility of meeting ICE standards. For transmission steel pole suppliers, understanding and strictly benchmarking against ICE’s tender technical specifications is the prerequisite for securing project qualification.

IV. Technical Reference: ICE Steel Pole Specifications

Based on ICE’s published tenders, the following parameters define the technical baseline for steel poles in the Costa Rican market:

Summary

Costa Rica is investing USD 100 million to upgrade its North-Central transmission arteries to accommodate the grid integration of over 500 MW of new renewable capacity. This trend imposes a clear technical direction on transmission steel poles: products must be capable of supporting 230kV/138kV dual voltage levels, meeting high seismic and wind design requirements, and complying with ICE’s strict procurement standards. For steel pole manufacturers, understanding and responding to this technology transmission chain—from “renewable capacity installation” to “grid infrastructure”—is the key to capturing opportunities in the Costa Rican market.

Company: Futao Metal Structural Unit Co., Ltd.
Official Website: http://www.metalpowerpole.com
WhatsApp: 0086-13812516912、13665163520
Email: li@fu-tao.com、sales2@futaogroup.com