Does she really not know or is she deliberately telling an out and out untruth?
During an interview with Fox News Sunday host Chris Wallace, Fox News contributor Sarah Palin falsely claimed that "20 percent of the US domestic supply of energy" comes from Alaska. In fact, according to the most recent data available from the Energy Information Administration, Alaska accounts for no more than 2.9 percent of total domestic energy production.
This is from the Media Matters website. You can read about it in more detail right here and also see the footage.