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Renewable energy

Grid Congestion Hinders Electric Vehicle Emissions Reduction

Strategic Insights

— 1 min read

Researchers at Northwestern University have found that the key obstacle to achieving significant emissions reduction from electric vehicles (EVs) is grid congestion. The study revealed that even if sufficient renewable energy is available, EVs will still rely on fossil fuel-generated energy without grid upgrades. Smart and targeted upgrades could solve grid congestion and unlock EVs' potential to combat climate change.

Key Takeaways:

  • Grid congestion emerges as a critical bottleneck, limiting the ability to transmit clean energy from generation sites to where it's needed, including EV charging stations.
  • The power lines are congested, leading to congestion-induced carbon dioxide emissions, even if clean energy is available.
  • Increasing the existing grid's transmission capacity by 3 to 13% could significantly reduce congestion, enabling more clean power from remote wind and solar farms to reach the cities and suburbs where EV charging demand is highest.
  • Targeted upgrades in areas where congestion is most likely to occur could alleviate grid congestion, rather than rebuilding the entire grid.
  • Improved connections and coordination among the three largely independent regions (Eastern, Western, and Texas) of the U.S. grid would help clean energy reach the areas that need it most.
  • The study recommends a modest set of targeted transmission grid upgrades to unlock the full emissions-reduction potential of EV adoption.

Statistics:

  • The grid draws electricity from closer, but more polluting, power plants that generate electricity by burning coal, oil, and gas.
  • 3 to 13% increase in the existing grid's transmission capacity could significantly reduce congestion.
  • The U.S. grid's transmission capacity would need to be increased by at least 3 to 13% to accommodate the expected growth in EV adoption.
  • The study found that every gas-powered vehicle in the U.S. that is replaced by an EV would lead to an increase in reliance on fossil fuel-generated power plants.

Sources:

  • (https://www.innovationnewsnetwork.com/us-transmission-grid-upgrades-crucial-to-realising-ev-transition/60542/)
  • (https://news.northwestern.edu/stories/2025/08/clean-energy-is-here-getting-it-to-evs-isnt/)
  • (https://www.nature.com/articles/s41467-025-61976-8)
  • (https://www.digitaljournal.com/tech-science/clean-energy-is-here-getting-it-to-evs-is-not/article)

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