2010年-世界发展银行全球_The_Potential_of_Regional_Power_Sector_Integration___Central_American_Electric_Interconnection_System_Transmission_and_Trading_Case_Study_55页_1mb

Summary of the Central American Electric Interconnection System (SIEPAC) Case Study

Core Content

The Central American Electric Interconnection System (SIEPAC) is a regional power sector integration initiative aimed at creating an integrated electricity market among six countries: Guatemala, El Salvador, Honduras, Costa Rica, Nicaragua, and Panama. The project includes the development of a regional electricity market (MER) and the construction of a new international transmission line to enhance cross-border electricity trade and efficiency.

Main Objectives

• To enable economies of scale in generation and improve efficiency through regional economic dispatch.
• To increase transfer capacity across borders to 300 MW.
• To promote private-sector participation in generation and transmission infrastructure.
• To create a legal and institutional framework for a regional market.

Key Components

• Regional Transmission Line: A 1,800 km line connecting Panama to Guatemala, enabling increased interconnection and trade.
• Regional Market (MER): A seventh market that connects the six national markets while maintaining their independence.
• Institutional Framework: Includes a regional regulator and a regional transmission operator (EPR), with supranational legal status.
• Ownership Structure: The transmission line is owned by a joint project company, with equal shares from the six national transmission companies, two neighboring countries (Mexico and Colombia), and one private-sector partner.

Funding and Support

• The project is primarily funded by the Inter-American Development Bank (IADB) at 59%, the Central American Bank for Economic Integration (CAF) at 25%, and the Corporación Andina de Fomento (CAF) at 4%, with 12% equity financing.
• The IADB has played a key role in project design, implementation, and governance.
• The Plan Puebla-Panama initiative has provided high-level political support.

Main Views and Key Information

Regional Electricity Market Design

• The regional market is designed to accommodate varying levels of market reform across the six countries.
• Countries like Costa Rica and Panama have more competitive markets, while Honduras and Costa Rica still operate with centralized utilities.
• The MER is structured to allow for gradual integration, as mandated by the Marco Treaty, which serves as the legal framework for the project.

Transmission Infrastructure

• The physical interconnection infrastructure is a critical enabler of the regional market.
• The SIEPAC transmission line is expected to increase regional transfer capacity significantly.
• The line was originally scheduled for commissioning in 2008 but was delayed and is now expected to be operational in 2010.

Current State of Integration

• In 2007, regional electricity trade was less than 1% of total generation, due to limited interconnection capacity.
• The regional market is now in operation, but trade remains at a low level.
• The project has faced delays in construction and is still in the early stages of implementation.

Energy Supply and Demand

• The region’s energy supply is dominated by hydroelectricity, which accounted for 46% of total generation in 2007.
• Fossil fuels make up only 9% of the generation mix, with thermal plants showing low efficiency (average load factor of 10%).
• Private-sector participation is growing, particularly in generation, with significant investments from multinational companies.
• Demand is growing at an average rate of 4.5% per year, with projections of a doubling in 15 years.

Tariffs and Market Structure

• Electricity tariffs vary significantly across the region due to different market structures and regulatory environments.
• Countries with less market reform (e.g., Costa Rica and Honduras) have the lowest average tariffs.
• The regional market aims to support fair pricing and efficient dispatch through a least-cost generation model.

Challenges and Future Plans

• The major challenge is to attract regional-level energy projects to fully utilize the new transmission line and market.
• No such projects are currently in place or under development.
• Additional interconnections are being studied, including a link between Mexico and Guatemala, and a southern extension to connect with Colombia.
• Institutional and regulatory coordination remains a key hurdle, requiring continued efforts to align national policies and market rules.

Conclusion

SIEPAC represents a significant step toward regional power sector integration in Central America. Despite progress in institutional development and the commencement of the transmission line, the project still faces challenges in achieving full market integration and attracting investment. The success of SIEPAC will depend on overcoming these obstacles and leveraging the region’s untapped energy potential to create a more efficient and competitive electricity market.