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Roger Caiazza's avatar

Excellent. Very readable description of a technical issue. I had heard that wind turbines did not do well in extemely cold weather but now I know why.

I think the reliability problem is even worse. The grid must supply power not only 24-7, 365 but electric resource planners also determine how much generating capacity is necessary to meet the probability of losing load not more than once in ten years the so-called loss of load expectation (LOLE) reliability criterion. Current resource assessments are based on observations of the existing uncorrelated generating resources over many years that show that unplanned outages do not happen at the same time. As you showed, that is not the case for wind and solar – they are highly correlated. Resource analysis for wind and solar must account for this.

The unacknowledged problem is what planning horizon should be used for weather-dependent resources to ensure that that the grid does not run out of electric energy when it is needed the most. This probabilistic planning process will be similar to watershed planning for the hundred-year flood. Inevitably, an extreme event will exceed the planning criteria and when that happens to the electric grid there will be a catastrophic blackout.

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Andy Fately's avatar

Perhaps the biggest problem with this report, which is excellent and comprehensive, is that this is not an isolated occurrence, but becoming the norm throughout those nations that have pushed for the end of oil and gas usage. It appears that Alberta suffered through a dunkelflaute, the best word I know of, and could well suffer more. thank goodness they had alternative sources at the ready

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