National Renewable Energy Laboratory’s Post

Extreme weather puts different kinds of stress on different technologies. So how do we plan the future grid to ensure we continue to meet demand? Check out the key findings from research by NREL and Sharply Focused LLC to learn more: https://bit.ly/3z8NN6r

To make the problem even worse...most distribution lines are not design to resist probabilistic weather conditions like Extreme Wind or Extreme Ice with Concurrent Wind. The load case that is used to design distribution lines is a 100-yr old deterministic load case NESC Rule 250B with Grade C load factors from NESC Rule 253. In many parts of the country the likelihood of exceeding the NESC 250B design loads is quite high, which leads to many distribution failures during extreme weather events. Failing distribution lines under Extreme wind events can also ignite wildfires. All overhead power lines, regardless of height or voltage, should be designed to the probabilistic weather loads in the specific locations were the lines are installed and not to just the deterministic district load case NESC Rule 250B.

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