Electric production is reported on an hourly basis in the U.S. but carbon emissions are reported on a monthly basis and are mostly based on calculation rather than measurement. There are huge discrepancies in the available reported data from the more than 4700 electricity generators in the U.S. These data are massaged by EPA to produce the annual average values that are used in the Energy Star program and for the U.S.'s international http://bashnya.netne.net reporting.Building use and operational assumptions are also important sources of uncertainty, and there are some efforts to address those issues in trying to improve the accuracy of building simulation models.

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