The Weather in the Details
Why have utilities lost millions of dollars on weather-normalization plans? Blame deprecated NOAA calculations.
NOAA’s measure of heating degree-days between a normal 30-year period and a given test year is consequently too high by 77 degrees when compared with the more accurate hourly estimates for the 30-year period and for the test year. In this case, a hypothetical Northwest utility would see a revenue shortfall of between $2 million and $5 million.