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Study published in Nature Energy by researchers from Tsinghua University and other institutes models a global zero net emissions electric system, estimates hourly demand in different regions, and points out that solar, wind, international transmission, and reduction of trade barriers would be decisive to enable clean electricity by 2050
Study published in Nature Energy calculates that a global zero net emissions electric system by 2050 would require between 15 and 20 TW of variable renewable energy, extensive solar and wind expansion, international transmission, and reduction of trade barriers to lower costs.
Global scale renewable would require up to 20 TW, study indicates
Between 15 and 20 TW of variable renewable energy would be necessary to sustain, by 2050, a global zero net emissions electric system, technically capable of meeting decent living standards in all regions.
The estimate comes from a study published in Nature Energy by researchers from Tsinghua University and other institutes. The work modeled how clean electricity could be produced, stored, transmitted, and used on a global scale.
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The analysis starts from a central question for governments, engineers, and planners: if the planet can operate solely with clean electricity, balancing emissions and removals of greenhouse gases. This balance is called zero net emissions.
Model crossed hourly demand, territory, and infrastructure
The study developed a global system resolved in space and time, with a grid of 0.25° by 0.25° and 8,760 hours. In practice, the team estimated the electric demand of different regions during all hours of a year.
From this reading, the model evaluated where renewable technologies, mainly solar and wind, could be installed, considering land availability and proximity to inhabited areas. The distance to load centers was treated as an essential factor.
The goal was to design an integrated system, capable of co-optimizing capacity expansion and operation. This means calculating where to build, how much to install, and how to operate the infrastructure to meet the demand.
The technologies considered include solar cells, wind turbines, hydroelectric power, green hydrogen production, carbon capture and storage, as well as ultra-high voltage transmission. The study also evaluated demand scenarios and sociotechnological advancement.
Renewable energy appears viable, but with great demands
The results indicate that global zero net emissions electrical systems are technically feasible. This conclusion, however, depends on a broad deployment of variable renewable energy and infrastructure capable of connecting production and consumption.
A central data point is the need for 15 to 20 TW of VRE, the acronym used for variable renewable energy. This category includes sources like solar and wind, which depend on natural conditions and require detailed operational planning.
The team also calculated that more than 80% of these renewable resources would be within 200 kilometers of load centers. This proximity suggests relevant technical potential but does not eliminate challenges of transmission, operation, and international coordination.
Photovoltaic solar energy alone would require more than 9 million hectares. The number shows that land use is a critical point to transform technical viability into real deployment, especially in densely populated regions.
Africa could gain more economical access to electricity
The study points out that abundant variable renewable energy resources can expand economic access to electricity in low-income regions, especially in parts of Africa. The expansion could contribute to climate justice and energy inclusion.
The logic is that areas with good solar and wind resources could produce clean electricity competitively, reducing historical access barriers. The model relates the energy transition not only to climate mitigation but also to equity.
This point is relevant because zero net emissions do not depend solely on technology. The system design needs to meet universal electricity needs associated with decent living standards, without concentrating benefits in already wealthier regions.
Costs fall with flexible demand and international cooperation
In addition to technical feasibility, the study identified strategies to reduce costs. Demand-side management, with changes in when and how electricity is used, could cut system costs by 6.5%, about $182 billion per year.
The expansion of international transmission would have the potential to reduce costs by 5.6%, approximately $157 billion annually. Meanwhile, removing trade barriers to renewable technologies could generate a decrease of 12.2%, equivalent to $345 billion per year.
These results indicate that the global renewable transition does not rely solely on installing solar panels and wind turbines. It requires larger grids, less restrictive trade, international coordination, and consumption planning.
For public policy makers, the study offers a technical map of priorities. Investments in international transmission, tariff reduction, and removal of trade barriers can directly influence the cost of a net-zero electric system.
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