On rare occasions, there are errors in the data that have been manually corrected. For most erroneous zero values, the previous valid non-zero value is held until the next valid non-zero value. For a few other erroneous values, a straight line of values between the two valid values is calculated. The occurrence of the errors is rare enough to be negligible, and is generally an error with most of the values in a particular 30-minute time period, rather than an error in one particular generation type.
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