Powering Strong Communities

Where More Transmission Is Needed


Map detailing the states with high demand and high supply and transmission congestion costs by RTOTransmission congestion costs topped an estimated $20.8 billion in 2022 – $7 billion higher than 2021. Within the regional transmission organizations, these costs increased by more than 200% since 2016. Alleviating these costs will require building and enhancing transmission capacity between areas with differences in power supply costs and need.

  • 18 states and the District of Columbia have more megawatt-hours in sales than net generation.  
  • Transmission congestion costs in the Southwest Power Pool were more than six times higher in 2022 than 2016.
  • An analysis of the potential value of new transmission found a median marginal value of $24 per megawatt-hour in interregional connections.
  • The highest value connection estimated would connect SPP and ERCOT.
  • Extreme conditions and events skew the perceived value and need for transmission.


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