全球能源和气候模型2023-英-127页_3mb

Global Energy and Climate Model Summary

Core Content

The Global Energy and Climate (GEC) Model is the IEA's principal tool for generating long-term energy scenarios, integrating the strengths of the World Energy Model (WEM) and Energy Technology Perspectives (ETP) models. It provides a detailed, bottom-up, partial-optimization framework to analyze the global energy system across 29 regions, covering all energy sectors and their interactions with environmental, economic, and social factors.

The GEC Model supports three main scenarios:

• Net Zero Emissions by 2050 Scenario (NZE Scenario): A normative scenario aiming to achieve net zero CO₂ emissions from the energy sector by 2050 without relying on land-use offsets. It aligns with the UN 2030 Agenda for Sustainable Development, focusing on universal energy access, air quality improvements, and climate goals.
• Announced Pledges Scenario (APS): An exploratory scenario that reflects the full implementation of climate commitments made by governments and industries by the end of August 2023, including NDCs and long-term net zero targets.
• Stated Policies Scenario (STEPS): A more conservative scenario that evaluates the current and under-development energy policies without assuming full implementation of all targets.

These scenarios are used to explore different future trajectories of the global energy system, highlighting the role of policy, technology, and market dynamics in shaping outcomes.

Key Viewpoints

• Policy Influence: Government decisions are the primary differentiator between the scenarios, emphasizing the importance of policy in driving the energy transition.
• Integrated Approach: The NZE Scenario integrates energy and sustainable development goals, such as universal energy access, air quality improvements, and climate action.
• Technological Transition: The scenarios examine the deployment of clean energy technologies, including renewables, hydrogen, and biofuels, as well as the evolution of energy systems and supply chains.
• Climate Goals: The NZE Scenario is aligned with the IPCC's Sixth Assessment Report and the Paris Agreement, aiming to limit global temperature rise to 1.5°C with at least 50% probability.

Key Information

1.1 GEC Model Scenarios

• NZE Scenario:

  • Achieves net zero CO₂ emissions by 2050.
  • Includes universal energy access by 2030 and major air quality improvements.
  • Relies on a broad portfolio of clean technologies and fair global cooperation.
  • Highlights the need for policy, infrastructure, and investment in critical minerals and clean energy technologies.

• APS Scenario:

  • Assumes all announced climate pledges and targets are met.
  • Includes both 2030 and long-term net zero or carbon neutrality goals.
  • Reflects the potential impact of current commitments on global energy demand and emissions.

• STEPS Scenario:

  • Reflects current and under-development policies.
  • Does not assume full implementation of all pledges.
  • Provides a benchmark for assessing the potential of recent policy developments.

1.2 Selected Developments in 2023

• Regional Expansion: The number of regions increased from 26 to 29, including specific regions for Chile, Colombia, Costa Rica, and Argentina.
• Model Enhancements:
  • Behavioural Analysis: Comprehensive assessment of climate pledges to incorporate behavioral changes into the APS.
  • Buildings Sector: Updated activity drivers, building demolition rates, and heating/cooling degree days projections.
  • Industry Sector: Increased technology granularity for aluminium and steel production, improved tracking of scrap and waste resources.
  • Transport Sector: Enhanced road freight projections, integration of the aviation model, inclusion of methanol in the shipping module, and improved rail activity and energy demand projections.
  • Hourly Electricity Demand: A new load curve model enables high-confidence simulations of electricity demand across different weather years.
  • Electricity Generation: A new hourly dispatch model assesses the impact of weather variability on power system operations and long-term flexibility.

Cross-Cutting Inputs and Assumptions

• Population: Assumptions are based on regional data, reflecting demographic trends.
• Macroeconomic Factors: Includes GDP growth rates and their implications for energy demand and investment.
• Prices: Covers fossil fuel and clean energy prices, as well as CO₂ pricing mechanisms.
• Policies: Assesses the impact of various policy actions on energy demand, supply, trade, and emissions.
• Techno-Economic Inputs: Models technology costs, learning rates, and the feasibility of deployment.

Energy Sectors

• End-use Sectors: Industry, transport, buildings, and others, with detailed modeling of energy service and material demand.
• Electricity Generation and Heat Production: Includes a variety of technologies, such as renewables, hydrogen, and fossil fuels, with detailed cost and efficiency analysis.
• Energy Transformation: Encompasses refining, hydrogen production, biofuels, and related infrastructure and trade.
• Energy Supply: Covers fossil fuel exploration, extraction, and trade, as well as renewable energy resource availability.

Environmental and Social Impacts

• Emissions: Analyzes CO₂, methane, and other greenhouse gas emissions, as well as air pollution and temperature outcomes.
• Energy Access: Assesses trends in access to electricity and clean cooking, and the associated investments and emissions changes.
• Employment: Evaluates the impact of the energy transition on employment across different skill levels and occupations.

Investment and Policy Analysis

• Investment Requirements: Includes capital needs for fuel supply, power generation, and end-use sectors.
• Clean Energy Investment: Assesses the impact of policy on investment in clean technologies.
• Government Spending: Examines the role of government spending in supporting clean energy and affordability.

Conclusion

The GEC Model is a comprehensive, data-intensive tool that enables the IEA to explore a wide range of energy and climate scenarios. It provides critical insights into the feasibility of achieving net zero emissions by 2050, the role of policy and technology in driving the transition, and the implications of different pathways on global energy security, affordability, and sustainability. The 2023 updates enhance the model's ability to reflect current and future trends, ensuring it remains a robust and relevant framework for global energy planning.