转向可再生能源：气候安全能源解决方案（英文版）_56页-5mb

Summary of "Turning to Renewables: Climate-Safe Energy Solutions"

Core Content

The document "Turning to Renewables: Climate-Safe Energy Solutions" is a publication by the International Renewable Energy Agency (IRENA) aimed at COP23, held in Bonn, Germany in 2017. It presents four briefs that examine the role of renewable energy in achieving climate-safe energy solutions, emphasizing the importance of transitioning to a sustainable energy future.

Main Points

1. Renewable Energy as a Climate Solution

• Energy Decarbonisation is Critical: To limit global temperature rise to well below $2^{\circ}\mathrm{C}$, as per the Paris Agreement, the share of renewables in the world's primary energy supply must increase from 15% to 65% by 2050.
• Current Emissions Trends: 2016 was the hottest year on record, with 16 of the 17 hottest years occurring in the 21st century. The world is already on track to miss the Paris Agreement goals, with nearly $1^{\circ}\mathrm{C}$ of warming since the pre-industrial era.
• Energy Sector's Role: Around two-thirds of global greenhouse gas (GHG) emissions stem from energy production and use, making it central to climate change mitigation. The largest contributors are electricity generation and industry, responsible for about 65% of all energy-related $\mathrm{CO}_{2}$ emissions, while transport, buildings, and district heating account for the remaining 35%.
• Decarbonisation Pathways: The energy sector must undergo a total transformation, moving from fossil fuels to zero-carbon energy production. In the REmap scenario, renewable energy is projected to supply 80% of global electricity by 2050, with the rest from natural gas and nuclear.
• Emissions Reductions: The REmap scenario predicts a 70% reduction in energy-related $\mathrm{CO}_{2}$ emissions compared to the Reference Case. Renewable energy could contribute to 44% of these reductions, with other low-carbon solutions covering the remaining 10%.

2. Socio-Economic Benefits of Renewable Energy

• Job Creation: The renewable energy sector alone could support around 26 million jobs in 2050, with net job creation more than offsetting job losses in the conventional energy sector.
• Health and Wellbeing: Health benefits from reduced air pollution could save between two and six times more than the cost of decarbonisation, which is estimated at USD 1.8 trillion per year in 2050.
• Economic Growth: The energy transition is expected to boost global GDP by 0.8% in 2050, resulting in a cumulative gain of USD 19 trillion between 2015 and 2050.
• Social Inclusiveness: Renewable energy can support more inclusive socio-economic development, including improved access to energy in rural areas, which can lead to better livelihoods and quality of life.

3. Sharply Falling Generation Costs

• Cost Competitiveness: Renewable energy technologies, especially solar PV and wind, have seen dramatic cost reductions over the past two decades, making them increasingly competitive with fossil fuels and nuclear.
• Current Costs: In 2016, the average cost of electricity from renewable sources (excluding offshore wind and CSP) was within the range of fossil fuels (USD 0.45/kWh to USD 0.14/kWh).
• Future Cost Projections: IRENA predicts further cost reductions in the coming decade, which will make renewable energy even more economically viable.
• Flexibility and Storage: As renewable energy becomes more variable, flexibility options such as time-of-use pricing, demand-side response, and storage (mainly pumped hydro and batteries) are essential for grid stability.

4. Accelerating Research for a Low-Carbon Future

• Research and Development (R&D): R&D is critical for enabling renewable energy solutions in sectors like transport, buildings, and industry, where current technologies are less mature.
• Stranded Assets: Delaying the energy transition could result in significant stranded assets, with cumulative costs reaching USD 20 trillion by 2050 if action is delayed by a decade.
• Investment Needs: Net additional investment for the energy transition is estimated at USD 29 trillion between 2015 and 2050, averaging about USD 830 billion per year.
• Innovation and Market Design: Innovation, new business models, and market designs are necessary to accelerate the transition. Emphasis is placed on expanding R&D efforts beyond the power sector to include end-use technologies like biofuels and hydrogen.

Key Information

• IRENA's Role: IRENA is an intergovernmental organization that promotes renewable energy and provides policy, technology, and financial knowledge.
• REmap Scenario: This is a low-carbon energy pathway that aims to achieve 65% renewable energy share in the global primary energy supply by 2050.
• Renewables4Climate Initiative: This global initiative aims to raise awareness about renewable energy as a key climate solution.
• Global Temperature Goals: The Paris Agreement allows for only an additional $0.6^{\circ}\mathrm{C}$ to $1.1^{\circ}\mathrm{C}$ of warming, meaning current national pledges are insufficient.
• Asset Stranding: If the energy transition is delayed, the risk of stranded assets increases, particularly in buildings and upstream fossil fuel infrastructure.

Conclusion

The transition to renewable energy is not only essential for meeting climate goals but also offers substantial socio-economic benefits. With falling generation costs, increasing job creation, and significant economic growth potential, renewable energy is a viable and necessary path toward a sustainable future. However, accelerated research, innovation, and investment are required to ensure the transition is successful and equitable.