2012年-世界发展银行全球_Geothermal_Handbook___Planning_and_Financing_Power_Generation_164页_4mb

Summary of the GEOTHERMAL HANDBOOK: PLANNING AND FINANCING POWER GENERATION

Core Content

This handbook provides an overview of geothermal energy as a viable source of electricity generation for developing countries. It outlines the planning and financing aspects of geothermal projects, emphasizing the importance of resource assessment, institutional support, and financial strategies to mitigate risks and ensure sustainability.

Main Findings and Recommendations

• Geothermal Energy Overview: Geothermal energy has been used for electricity generation since the early 20th century, with the first installation in Larderello, Italy, in 1904. As of 2011, about 11 GW of geothermal power capacity has been developed globally, but it still represents only 0.3% of the world's total electricity generation.

• Geothermal Potential: Nearly 40 countries have enough geothermal potential to meet their entire electricity demand from a technical standpoint. Over 90 countries have identified geothermal resources, and more than 70 have some experience in utilizing them. Currently, 24 countries produce electricity from geothermal sources.

• Benefits of Geothermal Energy:

  • Renewable and fossil-fuel free
  • Provides stable, reliable base-load power
  • Low operational and technological risks
  • Levelized generation costs range from $0.04 to $0.10 per kWh for medium-sized plants (around 50 MW)
  • Offers an opportunity to diversify electricity supply and reduce future fuel price volatility

• Environmental and Social Considerations:

  • Geothermal energy is environmentally beneficial, producing significantly less CO₂ than fossil fuel-based generation
  • Local environmental impacts are generally positive due to reduced air pollution and fuel transportation risks
  • Social and environmental impacts must be managed and affected groups consulted throughout the project lifecycle
  • Impacts are usually localized and reversible with proper mitigation measures

• Barriers to Development:

  • Limited geographical availability of hydrothermal resources (only 1/4 to 1/3 of the planet's surface has suitable geothermal resources)
  • High upfront costs and long lead times, with investment costs estimated at around $4 million per MW
  • Geothermal projects are capital-intensive and have high financing risks
  • Resource risk (or exploration risk) is a major challenge due to the difficulty in accurately estimating resource capacity and the costs involved in development

Phases in Geothermal Development

Geothermal projects are divided into the following development phases:

1. Preliminary Survey
2. Exploration
3. Test Drilling
4. Project Review and Planning
5. Field Development and Production Drilling
6. Construction
7. Start-up and Commissioning

The test drilling phase is considered the riskiest and most capital-intensive, accounting for up to 15% of the overall capital cost. It is critical for confirming the viability of the resource before significant investment is made.

Key Elements of Successful Geothermal Development

Four key elements are essential for successful geothermal development:

• Accurate Resource Information: Reliable data on geothermal attributes (e.g., seismic data, deep drilling data) is crucial for project planning.
• Effective Institutions: Dedicated and capable institutions are needed to manage the development process and support project implementation.
• Supportive Policies and Regulations: Policies that facilitate geothermal development, including land rights, permits, and financial incentives, are vital.
• Suitable Financing Access: Access to appropriate financing options is necessary to support the long development cycle of geothermal projects.

Financing and Risk Management

• Financing Risks: High upfront costs and long lead times increase financing risk, which is common across other renewable energy technologies.

• Risk Mitigation Strategies:

  • Geothermal Risk Insurance (GRI) and Geothermal Well Productivity Insurance (GWPI) can help manage exploration and production risks.
  • Public-Private Partnerships (PPPs) and Public Support are recommended to reduce the financial burden on private investors.
  • Concessional Financing Facilities and Climate Investment Funds (CIFs) are important tools for supporting geothermal development, especially in developing countries.

• Financing Models: Various international models, such as Build, Operate, and Transfer (BOT) and Design, Build, Finance, and Operate (DBFO), are used to structure geothermal projects. These models help in sharing risks and rewards between public and private sectors.

• Investment Cost Estimates: The handbook provides indicative costs for geothermal development, with a focus on utility-scale projects. These costs are broken down by project phases, highlighting the importance of cost management during the development cycle.

• Recommendations:

  • Governments should support geothermal development through public funding, policy frameworks, and institutional capacity building.
  • Developers should use probabilistic techniques like decision trees and Monte Carlo simulations to evaluate risks and maximize expected outcomes.
  • A portfolio approach and parallel development of multiple geothermal fields can reduce resource and project risks.

Conclusion

Geothermal energy offers a promising and sustainable solution for electricity generation, especially for developing countries. However, its development requires careful planning, accurate resource assessment, supportive policies, and strategic financing. The handbook serves as a guide for decision-makers and project developers to navigate the complexities of geothermal energy projects and implement them effectively.