In the United States, fossil fuel-based electricity production currently accounts for 38% of carbon dioxide emissions, which are the main cause of global warming. Five years ago, many people believed that wind and solar energy alone could only meet 20% to 30% of all electricity demand.
According to data released recently by the non-profit organization Carbon Disclosure Project (CDP), more than 100 cities around the world have achieved 70% of their electricity supply through the use of renewable energy. Compared to the 40 cities in the list in 2015 (more than 70%), the number has increased at least twice, and they have great potential for sustainable development. 70% of the electricity supply in Seattle, Norway, Oslo, Norway, Vancouver, Canada, and Nairobi, Kenya, is provided by renewable energy.
Statistics show that 275 cities use hydropower, and there are 189 and 184 cities that rely on wind and solar power, respectively. Reykjavik in Iceland and Burlington in the United States are the most representative. The former is dominated by hydropower and geothermal power, while the latter finds sources of electricity from wind, hydro, solar and biomass. In the United States, 58 cities, including Atlanta and San Diego, have plans to transition to 100% clean renewable energy.
Not long ago, a study by Finland and Germany also showed that with the current state of the art, it is expected to achieve 100% renewable energy supply on a global scale in 2025, and finally achieve the goal of zero carbon emissions, and the cost will be lower than 2015. Average cost of the year. This study envisages that by 2050, solar power accounts for 57.55%, wind power accounts for 37.14%, hydropower accounts for 4%, wave energy accounts for 0.58%, geothermal power accounts for 0.67%, and tidal power accounts for 0.06%.
In addition, a recent study by the University of California, Irvine, the California Institute of Technology, and the Carnegie Institute of Science, a team that recently published a study that is encouraging, solar and wind power can meet 80% of the US electricity demand. The team learned about the barriers to solar-only and wind-power generation by analyzing hourly weather data from the United States from 1980 to 2015. They studied the temporal and spatial changes in solar and wind energy and compared them to US electricity demand. It is concluded that by building a continental transmission network, 80% of the required power can be obtained.
In the United States, fossil fuel-based electricity production currently accounts for 38% of carbon dioxide emissions, which are the main cause of global warming. Five years ago, many people believed that wind and solar energy alone could only meet 20% to 30% of all electricity demand.
The joint research team pointed out that increasing transmission or storage capacity means huge investment, and the cost of new transmission lines can reach hundreds of billions of dollars. In addition, it is necessary to overcome the energy reserve problems caused by seasonal and weather changes in order to achieve the ideal standard of meeting 80% of electricity demand. Steven Davis, associate professor of Earth Systems Science at the University of California, Irvine, said, "If you want a reliable power system based on solar and wind energy, consider how to deal with its daily and seasonal changes. Our work shows that other needs are still needed. Low-carbon emission methods such as nuclear power, etc., to make up for the gap until the final power storage and transmission capacity reaches the desired level."
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